[{"data":1,"prerenderedAt":459},["ShallowReactive",2],{"site-header":3,"site-footer-license":37,"article-optimistic-vs-pessimistic-locking-mengatasi-rebutan-data-di-database-with-latest":41},{"navigations":4},[5,20],{"collection":6,"item":7},"series",{"__typename":6,"title":8,"slug":9,"children_series":10},"Artikel","all",[11,14,17],{"title":12,"slug":13},"Algoritma dan Struktur Data","algoritma-struktur-data",{"title":15,"slug":16},"Konsep Dasar Pemrograman","konsep-dasar-pemrograman",{"title":18,"slug":19},"Kecerdasan Artifisial","kecerdasan-artifisial",{"collection":6,"item":21},{"__typename":6,"title":22,"slug":23,"children_series":24},"Tutorial","tutorial",[25,28,31,34],{"title":26,"slug":27},"Belajar Java","belajar-java",{"title":29,"slug":30},"Belajar Pascal","belajar-pascal",{"title":32,"slug":33},"Belajar Python","belajar-python",{"title":35,"slug":36},"Belajar Golang","belajar-golang",{"name":38,"url":39,"show":40},"CC BY-SA","https://creativecommons.org/licenses/by-sa/4.0/",false,{"article":42,"renderedBody":414,"renderedTakeaway":415,"latestArticles":416,"toc":439},{"id":43,"title":44,"slug":45,"excerpt":46,"published_at":47,"thumbnail_image":48,"tags":50,"reading_time":58,"takeway":59,"body":60,"authors":61,"series":68},"38","Optimistic vs Pessimistic Locking: Mengatasi Rebutan Data di Database","optimistic-vs-pessimistic-locking-mengatasi-rebutan-data-di-database","Seribu orang ngeklik \"Beli Sekarang\" di detik yang sama buat rebutan 1 tiket terakhir. Kira-kira apa yang bakal terjadi di server kalian? Yuk, kita banding *pessimistic* sama *optimistic locking*!","2026-08-24T06:16:37.198Z",{"id":49},"21ab769d-6f82-4a22-be11-17ac16e9fb6b",[51,52,53,54,55,56,57],"backend","database","concurrency","postgresql","system-design","architecture","sql",5,"- Race Condition dan Lost Update Problem muncul pas banyak pengguna ngedit *row* yang sama secara barengan.\n- *Pessimistic Locking* ngunci data secara fisik di level database lewat `SELECT ... FOR UPDATE`, cocok buat persaingan tinggi kayak *flash sale* tiket.\n- *Optimistic Locking* main di kolom *version* atau *timestamp* tanpa ngunci *row*, pas buat trafik *high read* dengan frekuensi konflik rendah.\n- Pemilihan strategi yang tepat ngejaga integritas data tanpa ngorbanin *throughput* aplikasi.","Seribu orang ngeklik tombol \"Beli Sekarang\" di detik yang sama, cuma buat rebutan 1 tiket konser terakhir. Kira-kira, apa yang terjadi di server? 🤔\n\nTanpa mekanisme pengamanan *concurrency* yang bener, sistem kalian bisa kena bencana yang namanya *Race Condition* atau *Lost Update Problem*. Tiketnya kejual ke 5 orang sekaligus, sementara stok di database malah berubah minus. Kacau banget, kan? 😅\n\nDi dunia backend dan database, dua transaksi yang nge-*update* *row* yang sama secara bersamaan harus diatur dengan cermat. Dua pendekatan yang paling sering dipakai buat nanganin rebutan data ini adalah *Pessimistic Locking* dan *Optimistic Locking*.\n\nYuk, kita bedah bedanya, plus kapan mending pakai yang mana.\n\n## Gimana Cara Orang Ngedit Dokumen Bareng?\n\nBiar kebayang, anggap aja dua transaksi itu kayak dua orang yang ngedit dokumen yang sama di kantor.\n\nGaya pertama itu *pessimistic*: seorang staf ngambil dokumen fisik dari lemari arsip, terus ngunci lemarinya pakai gembok dan bawa kuncinya. Siapa pun yang mau baca atau ngedit harus ngantre berdiri di depan lemari sampai staf itu kelar. Filosofinya kira-kira: \"Ah, paling bakal ada yang ngubah barengan, mending dikunci dari awal aja, deh.\"\n\nGaya kedua itu *optimistic*: dokumennya difotokopi dan dibagi ke semua orang, tiap lembar dikasih nomor versi. Semua bebas ngedit di mejanya masing-masing. Pas mau nyimpen ke arsip pusat, barulah dicek—\"masih versi 1.0 nggak? Kalau iya, simpan dan naikin jadi 1.1. Kalau udah ada yang nyimpen 1.1 lebih dulu, revisimu ditolak, ambil salinan terbaru!\" Gaya ini santai di awal, tapi tegas di akhir.\n\n## Apa Sih *Pessimistic Locking* Itu?\n\n*Pessimistic Locking* bekerja dengan ngunci *row* (*row-level lock*) atau tabel langsung di database. Fitur ini disediakan lewat transaksi relasional di database kayak [PostgreSQL](https://www.postgresql.org/) atau [MySQL](https://www.mysql.com/).\n\nPas transaksi dimulai, *query*-nya baca data pakai klausa `SELECT ... FOR UPDATE`:\n\n```sql\nBEGIN;\n\n-- Mengunci baris produk ID 42 agar nggak bisa diubah transaksi lain\nSELECT id, stock, price\nFROM products\nWHERE id = 42\nFOR UPDATE;\n\n-- Lakukan kalkulasi di aplikasi\n-- Update stok jika masih tersedia\nUPDATE products\nSET stock = stock - 1\nWHERE id = 42;\n\nCOMMIT; -- Gembok dilepas, transaksi lain baru boleh masuk\n```\n\nKelebihannya jelas: aman. Kita dijamiin 100% **nggak ada data yang tumpang tindih**, soalnya transaksi lain dipaksa ngantre (*blocking*).\n\nTapi, ada harganya. *Throughput* bisa turun drastis kalau banyak *request* ngantre di *row* yang sama. Dan kalau kita kurang hati-hati ngatur urutan penguncian, sistem bisa kena *Deadlock* (kebuntuan) di mana dua transaksi saling nunggu selamanya.\n\n## Terus, *Optimistic Locking* Kerjanya Gimana?\n\nBeda sama yang tadi, *Optimistic Locking* sebenernya **nggak ngunci apa pun secara fisik**. Pendekatan ini ngandelin logika aplikasi, dengan bantuan kolom penanda versi kayak `version INT` atau `updated_at TIMESTAMP`.\n\nAlurnya kira-kira gini:\n\n1. Baca data beserta versinya sekarang.\n   ```sql\n   SELECT id, stock, version FROM products WHERE id = 42;\n   -- Hasil: stock = 10, version = 1\n   ```\n2. Hitung di aplikasi, terus simpan cuma kalau versinya belum berubah.\n   ```sql\n   UPDATE products\n   SET stock = stock - 1, version = version + 1\n   WHERE id = 42 AND version = 1;\n   ```\n3. Cek jumlah *row* yang kena dampak (*rows affected*). Kalau hasilnya 1, berarti berhasil dan versinya naik jadi 2. Kalau hasilnya 0, artinya ada transaksi lain yang nyimpen lebih dulu—aplikasi bisa ngebatalin atau nyoba *retry*.\n\nKelebihannya, ini cepat dan nggak ada proses yang diblokir (*non-blocking*). Cocok banget buat aplikasi yang beban bacanya tinggi (*high read throughput*).\n\nKekurangannya, kalau tingkat bentrokan (*contention*) tinggi—misal rebutan 1 tiket konser—mayoritas transaksi bakal gagal. *Retry* beruntun itulah yang akhirnya ngabisin *CPU* kalian. 😅\n\n## Contoh Kode di Python / SQLAlchemy\n\nBerikut perbandingannya pakai [SQLAlchemy Concurrency](https://docs.sqlalchemy.org/en/20/orm/queryguide/concurrency.html):\n\n```python\nfrom sqlalchemy.orm import Session\nfrom sqlalchemy import select\nfrom models import Product\n\n# 1. Implementasi Pessimistic Locking\ndef buy_product_pessimistic(db: Session, product_id: int, quantity: int):\n    # Menggunakan with_for_update() untuk memicu 'SELECT ... FOR UPDATE'\n    product = db.execute(\n        select(Product)\n        .where(Product.id == product_id)\n        .with_for_update()\n    ).scalar_one()\n\n    if product.stock \u003C quantity:\n        raise ValueError(\"Stok nggak mencukupi!\")\n\n    product.stock -= quantity\n    db.commit()\n    return product\n\n# 2. Implementasi Optimistic Locking\ndef buy_product_optimistic(db: Session, product_id: int, quantity: int):\n    # Baca data tanpa lock fisik\n    product = db.execute(\n        select(Product).where(Product.id == product_id)\n    ).scalar_one()\n\n    if product.stock \u003C quantity:\n        raise ValueError(\"Stok nggak mencukupi!\")\n\n    current_version = product.version\n\n    # Update bersyarat mencocokkan nomor versi\n    result = db.query(Product).filter(\n        Product.id == product_id,\n        Product.version == current_version\n    ).update({\n        \"stock\": product.stock - quantity,\n        \"version\": current_version + 1\n    })\n\n    if result == 0:\n        db.rollback()\n        raise ValueError(\"Bentrokan data terdeteksi! Silakan ulangi transaksi.\")\n\n    db.commit()\n    return product\n```\n\nDi versi *optimistic*, kunci utamanya ada di klausa `WHERE id = 42 AND version = 1`. Kalau versinya udah berubah duluan, update-nya nggak ngefek ke *row* mana pun, dan `result` bakal bernilai 0. Cek inilah yang jadi pengganti **kunci fisik**.\n\n## Kapan Pakai yang Mana, Sih?\n\nGampangnya, lihat seberapa sering bentrokan datanya terjadi.\n\n| Kriteria | *Pessimistic Locking* | *Optimistic Locking* |\n| :--- | :--- | :--- |\n| Tingkat Bentrokan | Tinggi (banyak yang rebutan 1 *row*). | Rendah sampai sedang. |\n| Karakteristik Trafik | Transaksi finansial, *flash sale*, *booking*. | Profil *user*, edit blog, katalog umum. |\n| Biaya Kegagalan | Antrean waktu tunggu (*blocking latency*). | Biaya komputasi buat *retry*. |\n| Mekanisme | Kunci fisik database (`FOR UPDATE`). | Kolom *version* / *timestamp* di logika aplikasi. |\n\nJadi, buat persaingan tinggi yang butuh integritas mutlak, pakai *pessimistic*. Buat trafik yang didominasi baca dengan konflik jarang, *optimistic* jauh lebih enteng.\n\n## Jadi, Mana yang Harus Kita Pilih?\n\nNggak ada solusi tunggal yang sempurna buat semua kasus. Yang penting, kita paham dulu karakter transaksi di aplikasi sendiri.\n\nPakai *Pessimistic Locking* pas integritas mutlak tanpa toleransi *retry* bener-bener dibutuhkan di tengah persaingan tinggi. Sebaliknya, manfaatkan *Optimistic Locking* biar sistem tetap gesit di transaksi yang risikonya bentrok rendah.\n\nKalau salah pilih, **bukan cuma data yang kacau**—*CPU* kalian juga bisa ikut nangis. Hehe.\n\nSelamat ber-*locking* ria, dan semoga transaksi kalian selalu selamat dari rebutan yang bikin pusing! 👋",[62],{"authors_id":63},{"name":64,"slug":65,"role":66,"profile_picture":67},"Inva","inva","Writer",null,{"id":69,"title":8,"slug":9,"articles":70,"parent_series":67},"9",[71,85,97,109,119,132,142,153,164,175,186,196,206,217,226,237,248,258,266,277,288,299,302,311,320,333,342,353,364,374,383,392,402],{"id":72,"title":73,"slug":74,"excerpt":75,"thumbnail_image":76,"tags":78},"41","Log Aggregation Modern dengan Grafana Loki dan Vector: Hemat Storage Tanpa Indeks Raksasa","log-aggregation-modern-grafana-loki-vector-hemat-storage","Klaster Elasticsearch kalian rakus RAM dan boros storage, ya? Padahal nggak semua kata di log perlu diindeks, lho. Yuk, kita kenalan sama duet Grafana Loki dan Vector yang jauh lebih ramah kantong!",{"id":77},"03c9d1a0-c80a-401d-9f2b-2b3ee7abb115",[51,79,80,81,82,83,84,55],"observa","logging","grafana","loki","vector","devops",{"id":86,"title":87,"slug":88,"excerpt":89,"thumbnail_image":90,"tags":92},"45","Rate Limiting Algorithms: Token Bucket vs Leaky Bucket vs Sliding Window","rate-limiting-algorithms-token-bucket-leaky-bucket-sliding-window","Udah tahu kenapa *rate limiting* itu wajib, tapi masih bingung beda Token Bucket, Leaky Bucket, Fixed Window, dan Sliding Window? Yuk, kita adu empat algoritma ini bareng-bareng dan cari tahu mana yang paling pas buat API kalian!",{"id":91},"0e0ed26d-20c6-443c-bde1-4a6200f6f801",[51,55,93,94,95,56,96],"rate-limiting","redis","api-gateway","traffict-management",{"id":98,"title":99,"slug":100,"excerpt":101,"thumbnail_image":102,"tags":104},"16","Menggunakan TypeScript dengan Node.js dan Express","menggunakan-typescript-dengan-node-js-dan-express","Pengen bikin server Express di Node.js tapi pakai fitur-fitur keren TypeScript? Yuk, intip cara setup lengkapnya dari nol di sini!",{"id":103},"798b60f1-9ef5-4f73-8d43-85825fd86acc",[105,106,107,108],"javascript","nodejs","express","typescript",{"id":110,"title":111,"slug":112,"excerpt":113,"thumbnail_image":114,"tags":116},"17","Pemrograman Asynchronous vs Multithreading, Apa Sih Bedanya?","pemrograman-asynchronous-dan-multithreading-apa-bedanya","Sering dengar istilah asynchronous dan multithreading pas ngoding tapi masih bingung bedanya? Yuk, kita bedah perbedaannya lewat analogi bikin mi instan yang gampang dipahami!",{"id":115},"9c05d0ae-e829-4f1b-b9f7-a84f3e0439d3",[117,53,118],"pemrograman","tips-coding",{"id":120,"title":121,"slug":122,"excerpt":123,"thumbnail_image":124,"tags":126},"33","Berkenalan dengan RabbitMQ: Si Kurir Pesan Serba Bisa","berkenalan-dengan-rabbitmq-si-kurir-pesan-serba-bisa","Pernah nggak sih kalian klik Bayar Sekarang dan notifikasi suksesnya muncul seketika, padahal email konfirmasi baru nyampe beberapa detik kemudian? Rahasianya ada di satu kurir tak terlihat. Yuk, kita kenalan sama RabbitMQ!",{"id":125},"f6620f79-b3b2-4f9c-8104-283a335e06c4",[127,128,51,129,130,131],"rabbitmq","message-broker","microservices","async","queue",{"id":133,"title":134,"slug":135,"excerpt":136,"thumbnail_image":137,"tags":139},"34","Kenapa Backend Butuh Database Connection Pooling?","kenapa-backend-butuh-database-connection-pooling","Pernah kena error Too many connections padahal CPU server masih santai di angka 30%? Masalahnya bukan di query kalian, tapi di cara aplikasi ngobrol sama database. Yuk, kenalan sama Connection Pooling!",{"id":138},"6f7a2d8c-2a37-4901-a522-50df8d9c0a20",[51,52,54,140,55,141],"connection-pooling","performance",{"id":143,"title":144,"slug":145,"excerpt":146,"thumbnail_image":147,"tags":149},"27","Background Worker & Task Queue: Jangan Jalankan Proses Berat di Request HTTP!","background-worker-task-queue-jangan-jalankan-proses-berat-di-http","Pernah nggak sih kalian klik Daftar Akun lalu halaman loading muter sampai 15 detik tanpa kepastian? Penyebabnya klasik banget. Yuk, kita bahas kenapa proses berat nggak boleh dijalanin di request HTTP!",{"id":148},"e119c6ad-fc37-4b92-abdc-3eb20f8e34b4",[51,150,151,152,127,94,130],"task-queue","celery","fastapi",{"id":154,"title":155,"slug":156,"excerpt":157,"thumbnail_image":158,"tags":160},"28","Mengatasi N+1 Query Problem: Musuh Tersembunyi Performa Backend","mengatasi-n-plus-1-query-problem-musuh-tersembunyi-backend","Pernah bikin endpoint yang cuma nampilin 50 postingan beserta nama penulisnya, tapi response-nya lambat banget? Bisa jadi kalian kena N+1 Query. Yuk, kita bedah penyebabnya dan cara memberantasnya!",{"id":159},"34b94e14-3e9a-4778-9f1f-6df5898915fb",[52,57,161,162,163,141,51],"orm","sqlalchemy","django",{"id":165,"title":166,"slug":167,"excerpt":168,"thumbnail_image":169,"tags":171},"30","Berkenalan dengan Bahasa Go: Kenapa Banyak Dipakai untuk Backend Modern?","berkenalan-dengan-bahasa-go-untuk-backend-modern","Kok bisa sih Go yang masih muda ini jadi bahasa andalan Docker sampai Kubernetes? Yuk, kita kenalan sama Goroutine, Channel, dan alasan dia hemat memori luar biasa!",{"id":170},"a368631c-f331-4c50-8322-1d0fc44927aa",[172,173,51,53,174,55],"golang","go","goroutine",{"id":176,"title":177,"slug":178,"excerpt":179,"thumbnail_image":180,"tags":182},"13","Hal yang Perlu Diperhatikan Sebelum Pindah ke Linux","hal-yang-perlu-diperhatikan-sebelum-pindah-ke-linux","Tertarik migrasi dari Windows ke Linux tapi masih ragu? Yuk, pelajari kelebihan, kekurangan, dan persiapan penting sebelum kamu benar-benar pindah!",{"id":181},"ae27713e-5025-4d13-88b6-efb4860cc5b3",[183,184,185],"linux","windows","foss",{"id":187,"title":188,"slug":189,"excerpt":190,"thumbnail_image":191,"tags":193},"11","Apa Kabar JavaScript? Rilis State of JS 2022","apa-kabar-javascript-rilis-state-of-js-2022","Survei State of JS 2022 resmi dirilis dengan lonjakan responden yang luar biasa! Framework dan build tool apa saja yang berhasil mencuri perhatian tahun ini?",{"id":192},"18df5262-d813-43d1-b1f7-5595a7f53602",[105,194,195],"web","news",{"id":197,"title":198,"slug":199,"excerpt":200,"thumbnail_image":201,"tags":203},"12","Buat PowerShell Lebih Berwarna dengan Starship","buat-powershell-lebih-berwarna-dengan-starship","Bosen sama tampilan PowerShell yang hitam putih dan kaku? Yuk, sulap terminalmu jadi lebih interaktif, estetik, dan berwarna pakai Starship!",{"id":202},"c5a8262b-43db-4479-8f6c-5a6a0d61653b",[204,184,205],"shell","powershell",{"id":207,"title":208,"slug":209,"excerpt":210,"thumbnail_image":211,"tags":213},"14","Instalasi Java dengan Visual Studio Code","instalasi-java-dengan-visual-studio-code","Mau belajar ngoding Java tapi spek laptop pas-pasan buat buka IDE berat? Yuk, cari tahu cara setup VS Code biar ngoding Java tetap lancar dan enteng!",{"id":212},"99b01cc2-11ac-4449-9927-a1a7116347df",[214,215,216],"howto","java","editor",{"id":218,"title":219,"slug":220,"excerpt":221,"thumbnail_image":222,"tags":224},"15","Kenapa Ada Banyak Sekali Distro Linux?","kenapa-ada-banyak-sekali-distro-linux","Pernah bingung pas mau install Linux tapi malah disuguhi puluhan pilihan distro? Tenang, kalian nggak sendirian. Yuk, cari tahu kenapa distro Linux bisa sebanyak itu dan apa bedanya!",{"id":223},"b5352a4b-f274-4489-aca9-36814947d514",[183,225],"distro",{"id":227,"title":228,"slug":229,"excerpt":230,"thumbnail_image":231,"tags":233},"18","React, Angular, atau Vue: Pilih Framework yang Mana?","react-angular-vue-pilih-framework-yang-mana","Bingung menentukan pilihan di antara React, Angular, dan Vue untuk proyek web kalian berikutnya? Tenang, yuk kita bandingkan kelebihan masing-masing di sini!",{"id":232},"ff111270-80c2-4ccb-83d7-d5ab8c021201",[234,235,236],"web-development","frontend","framework",{"id":238,"title":239,"slug":240,"excerpt":241,"thumbnail_image":242,"tags":244},"19","Static Typing dan Dynamic Typing: Apa Bedanya?","static-typing-dan-dynamic-typing-apa-bedanya","Pernah bingung kenapa di Java tipe data harus dideklarasikan, sementara di Python tinggal pakai aja? Yuk, cari tahu perbedaan static typing dan dynamic typing di sini!",{"id":243},"98e85e76-9e7b-42d1-b989-7c75e7f49abc",[245,246,247],"programming","types","comparison",{"id":249,"title":250,"slug":251,"excerpt":252,"thumbnail_image":253,"tags":255},"20","Tailwind v3.0 Rilis: Ada JIT, Arbitrary Values, dan Banyak Lagi!","tailwind-v3-0-rilis-jit-arbitrary-dan-banyak-lagi","Tailwind CSS v3.0 resmi dirilis dengan segudang peningkatan performa yang bikin proses coding makin asyik. Apa aja sih fitur andalan yang wajib dicoba?",{"id":254},"d5e879fa-5cd0-4015-a155-b0cc69ff12fb",[256,257,234],"tailwind-css","css-framework",{"id":259,"title":260,"slug":261,"excerpt":262,"thumbnail_image":263,"tags":265},"21","TypeScript: JavaScript dengan Gaya dan Tipe Data Statis","typescript-javascript-dengan-gaya","Pernah pusing gara-gara runtime error di JavaScript? Yuk, kenalan dengan TypeScript yang bawa fitur static typing biar kode kalian makin rapi dan aman!",{"id":264},"f615bb1f-8e36-4d6c-9c2c-f1629407173c",[108,105,234],{"id":267,"title":268,"slug":269,"excerpt":270,"thumbnail_image":271,"tags":273},"22","Yang Baru di Nuxt 3: Nitro Engine, Vite, dan Fitur Keren Lainnya","yang-baru-di-nuxt-3-nitro-vite-dan-banyak-lagi","Nuxt 3 hadir membawa perubahan arsitektur besar-besaran untuk menyelaraskan dengan Vue 3. Penasaran apa saja peningkatan performa dan fitur barunya?",{"id":272},"8444bdbc-f60c-4d8b-8593-1b49400e8659",[274,275,276],"nuxt-3","vue-3","frontend-framework",{"id":278,"title":279,"slug":280,"excerpt":281,"thumbnail_image":282,"tags":284},"23","Kenapa Pakai FastAPI dan Kenapa Dia Kenceng Banget?","kenapa-pakai-fastapi-dan-kenapa-dia-kenceng-banget","Sering dengar FastAPI tapi masih bingung kenapa dia bisa ngebut kayak NodeJS dan Go? Yuk, kita bedah bareng rahasia ASGI, sihir Pydantic, sampai dokumentasi otomatisnya!",{"id":283},"84847c9e-70ab-4dcc-bed7-7be50165f7f4",[152,285,51,286,287],"python","asgi","pydantic",{"id":289,"title":290,"slug":291,"excerpt":292,"thumbnail_image":293,"tags":295},"26","REST API vs gRPC: Kapan Sebaiknya Mulai Pindah dari JSON?","rest-api-vs-grpc-kapan-sebaiknya-pindah-dari-json","Pernah nggak sih sistem mikroservis kalian mulai kerasa berat padahal cuma tuker-tukeran data internal? Belum tentu masalah servernya. Yuk, kita bahas kapan REST + JSON masih juara dan kapan gRPC jadi jawabannya!",{"id":294},"487500a0-9e09-469d-8736-1583c5ea83aa",[51,296,297,129,298,55],"grpc","rest-api","protobuf",{"id":43,"title":44,"slug":45,"excerpt":46,"thumbnail_image":300,"tags":301},{"id":49},[51,52,53,54,55,56,57],{"id":303,"title":304,"slug":305,"excerpt":306,"thumbnail_image":307,"tags":309},"24","Kenapa Butuh Rate Limiting?","kenapa-butuh-rate-limiting","Pernah nggak sih endpoint login kalian diserbu bot yang nyoba nembak ribuan password cuma dalam semenit? Yuk, kita bahas kenapa Rate Limiting itu wajib, plus cara masangnya di FastAPI!",{"id":308},"1401f9e5-6359-404a-8d80-273ddee9a372",[51,93,55,310,94,152],"api",{"id":312,"title":313,"slug":314,"excerpt":315,"thumbnail_image":316,"tags":318},"25","Kenapa Event Queue Bikin Backend Kalian Nggak Gampang Tumbang?","kenapa-event-queue-bikin-backend-kamu-nggak-gampang-tumbang","Pernah klik tombol Beli Sekarang dan notifikasi suksesnya muncul dalam sekejap, padahal di belakang layar ada invoice, email, sampai push notification yang harus dibuat? Rahasianya Event Queue. Yuk, kita bedah!",{"id":317},"d9e76018-fbcc-4c69-ad42-8f75ff229ecd",[51,55,319,128,56],"event-queue",{"id":321,"title":322,"slug":323,"excerpt":324,"thumbnail_image":325,"tags":327},"46","Mengapa C Mulai Ditinggalkan: Duel Filosofi Keamanan Rust vs Kesederhanaan Zig","mengapa-c-mulai-ditinggalkan-duel-filosofi-rust-vs-zig","Pernah denger kalau sekitar 70% celah keamanan kritis software modern itu asalnya dari bahasa C? Iya, bahasa yang udah jadi fondasi internet ini 😅. Yuk, kita bedah duel filosofi Rust vs Zig dan cari tahu mana yang pas buat proyek kalian!",{"id":326},"1942a5c9-c1f6-476d-9913-768f78d9d8eb",[328,329,330,331,332],"system-programming","rust","zig","c","memory-safety",{"id":334,"title":335,"slug":336,"excerpt":337,"thumbnail_image":338,"tags":340},"29","Memahami Database Indexing: Rahasia Query Super Cepat","memahami-database-indexing-rahasia-query-super-cepat","Query kalian mulai lelet padahal data baru nembus jutaan baris? Sebelum buru-buru *upgrade* server, yuk cek dulu *index*-nya. Yuk, kita bedah gimana *database indexing* sebenernya kerja!",{"id":339},"b123036f-1779-478c-a545-cf5f189b5fe9",[52,57,54,341,141,51],"indexing",{"id":343,"title":344,"slug":345,"excerpt":346,"thumbnail_image":347,"tags":349},"31","Mengenal Redis: Lebih dari Sekadar In-Memory Cache","mengenal-redis-lebih-dari-sekadar-in-memory-cache","Masih nganggep Redis cuma buat caching? Padahal dia bisa jadi leaderboard, message broker, sampai rate limiter lho. Yuk, kita bedah semua kemampuannya!",{"id":348},"9595b7d7-60e0-48f5-a715-f3cf60f34e1d",[94,51,350,351,352,285],"cache","nosql","in-memory",{"id":354,"title":355,"slug":356,"excerpt":357,"thumbnail_image":358,"tags":360},"32","Docker Compose untuk Developer Santai: Satu Perintah Buat Jalankan Semua Service","docker-compose-untuk-developer-santai","Pernah nggak kalian ngulang-ngulang perintah `docker run` cuma buat nyalain web, database, dan cache satu-satu? Capek, kan? Yuk, kita rapikan semuanya jadi satu file dan satu perintah!",{"id":359},"f4c08f1b-e0d0-410c-b091-c3618944fb3e",[361,362,84,363,51],"docker","docker-compose","containers",{"id":365,"title":366,"slug":367,"excerpt":368,"thumbnail_image":369,"tags":371},"35","Mengenal Idempotency Key: Rahasia Anti-Double Charge di API Pembayaran","mengenal-idempotency-key-rahasia-anti-double-charge-di-api-pembayaran","Pernah internet kalian ngadat pas lagi nekan tombol Bayar, terus panik ngekliknya tiga kali? Kalau endpoint-nya nggak idempotent, saldo bisa kepotong berkali-kali. Yuk, kenalan sama Idempotency Key!",{"id":370},"724cb83a-3ce5-4ee2-b0d7-533e3a0fc7df",[51,310,372,55,373,152,94],"idempotency","payment",{"id":375,"title":376,"slug":377,"excerpt":378,"thumbnail_image":379,"tags":381},"36","Mencegah Efek Domino di Mikroservis dengan Circuit Breaker Pattern","mencegah-efek-domino-di-mikroservis-dengan-circuit-breaker-pattern","Pernah nggak sih, satu fitur minor di aplikasi kalian mendadak lelet, eh malah bikin halaman checkout dan login ikut down total? Itu namanya *cascading failure*. Yuk, kita bahas gimana *circuit breaker pattern* (pemutus arus) nyelametin arsitektur kalian!",{"id":380},"c2e8e37f-8f9a-423f-a09d-74613b3c2924",[51,129,382,55,56],"circuit-breaker",{"id":384,"title":385,"slug":386,"excerpt":387,"thumbnail_image":388,"tags":390},"37","Kenapa Backend Butuh Graceful Shutdown? Jangan Asal Cabut Kabel Server!","kenapa-backend-butuh-graceful-shutdown-jangan-asal-cabut-kabel-server","Pernah nggak sih, abis kalian nge-*deploy* backend, beberapa detik kemudian monitoring malah banjir *alert* **502 Bad Gateway** dari pengguna? Saldo udah kepotong tapi status order belum keburu ter-*update* di *database*. Yuk, kita bahas kenapa *graceful shutdown* itu wajib banget!",{"id":389},"251a54a7-1d24-47fd-8cbc-a46fd42cbb6f",[51,84,152,361,391,55,56],"kubernetes",{"id":393,"title":394,"slug":395,"excerpt":396,"thumbnail_image":397,"tags":399},"39","Database Sharding vs Partitioning: Kapan Data Perlu Dipecah?","database-sharding-vs-partitioning-kapan-data-perlu-dipecah","Tabel transaksi kalian udah nembus miliaran baris dan tiap *query* laporan bikin *CPU* melonjak 100%? Sebelum asal pecah data, yuk kita pahami dulu beda *sharding* sama *partitioning*!",{"id":398},"08ef5fe5-d935-47b3-bbbc-d976948b2a9e",[51,52,54,55,56,400,401],"sharding","scaling",{"id":403,"title":404,"slug":405,"excerpt":406,"thumbnail_image":407,"tags":409},"40","Menyelami Distributed Tracing: Melacak Jejak Request di Balik Keruwetan Microservices","menyelami-distributed-tracing-melacak-jejak-request-microservices","Satu klik Checkout di backend kalian bisa memicu puluhan network call antar-service, tapi pas ada yang lambat, service mana sebenernya yang salah? Log aja nggak cukup buat njawab itu. Yuk, kita bedah Distributed Tracing!",{"id":408},"1ace92fa-b89c-4cef-ab75-4e4cd67a089c",[51,410,411,412,129,56,413],"distributed-systems","observability","open-telemetry","tracing","\u003Cp>Seribu orang ngeklik tombol "Beli Sekarang" di detik yang sama, cuma buat rebutan 1 tiket konser terakhir. Kira-kira, apa yang terjadi di server? 🤔\u003C/p>\n\u003Cp>Tanpa mekanisme pengamanan \u003Cem>concurrency\u003C/em> yang bener, sistem kalian bisa kena bencana yang namanya \u003Cem>Race Condition\u003C/em> atau \u003Cem>Lost Update Problem\u003C/em>. Tiketnya kejual ke 5 orang sekaligus, sementara stok di database malah berubah minus. Kacau banget, kan? 😅\u003C/p>\n\u003Cp>Di dunia backend dan database, dua transaksi yang nge-\u003Cem>update\u003C/em> \u003Cem>row\u003C/em> yang sama secara bersamaan harus diatur dengan cermat. Dua pendekatan yang paling sering dipakai buat nanganin rebutan data ini adalah \u003Cem>Pessimistic Locking\u003C/em> dan \u003Cem>Optimistic Locking\u003C/em>.\u003C/p>\n\u003Cp>Yuk, kita bedah bedanya, plus kapan mending pakai yang mana.\u003C/p>\n\u003Ch2 id=\"gimana-cara-orang-ngedit-dokumen-bareng\">Gimana Cara Orang Ngedit Dokumen Bareng?\u003C/h2>\n\u003Cp>Biar kebayang, anggap aja dua transaksi itu kayak dua orang yang ngedit dokumen yang sama di kantor.\u003C/p>\n\u003Cp>Gaya pertama itu \u003Cem>pessimistic\u003C/em>: seorang staf ngambil dokumen fisik dari lemari arsip, terus ngunci lemarinya pakai gembok dan bawa kuncinya. Siapa pun yang mau baca atau ngedit harus ngantre berdiri di depan lemari sampai staf itu kelar. Filosofinya kira-kira: "Ah, paling bakal ada yang ngubah barengan, mending dikunci dari awal aja, deh."\u003C/p>\n\u003Cp>Gaya kedua itu \u003Cem>optimistic\u003C/em>: dokumennya difotokopi dan dibagi ke semua orang, tiap lembar dikasih nomor versi. Semua bebas ngedit di mejanya masing-masing. Pas mau nyimpen ke arsip pusat, barulah dicek—"masih versi 1.0 nggak? Kalau iya, simpan dan naikin jadi 1.1. Kalau udah ada yang nyimpen 1.1 lebih dulu, revisimu ditolak, ambil salinan terbaru!" Gaya ini santai di awal, tapi tegas di akhir.\u003C/p>\n\u003Ch2 id=\"apa-sih-pessimistic-locking-itu\">Apa Sih \u003Cem>Pessimistic Locking\u003C/em> Itu?\u003C/h2>\n\u003Cp>\u003Cem>Pessimistic Locking\u003C/em> bekerja dengan ngunci \u003Cem>row\u003C/em> (\u003Cem>row-level lock\u003C/em>) atau tabel langsung di database. Fitur ini disediakan lewat transaksi relasional di database kayak \u003Ca href=\"https://www.postgresql.org/\">PostgreSQL\u003C/a> atau \u003Ca href=\"https://www.mysql.com/\">MySQL\u003C/a>.\u003C/p>\n\u003Cp>Pas transaksi dimulai, \u003Cem>query\u003C/em>-nya baca data pakai klausa \u003Ccode>SELECT ... FOR UPDATE\u003C/code>:\u003C/p>\n\n\u003Cdiv class=\"code-block-wrapper my-6 not-prose rounded-xl border-2 border-black dark:border-gray-600 shadow-neo overflow-hidden bg-[#24292e] text-[#e1e4e8] transition-all\">\n  \u003Cdiv class=\"code-block-header flex items-center justify-between px-4 py-2.5 bg-[#1f2428] border-b-2 border-black dark:border-gray-600 font-mono text-xs font-bold text-gray-300 select-none\">\n    \u003Cdiv class=\"flex items-center gap-2\">\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ff5f56] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ffbd2e] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#27c93f] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"ml-2 font-mono font-bold text-xs uppercase tracking-wider text-gray-300\">SQL\u003C/span>\n    \u003C/div>\n    \u003Cbutton type=\"button\" class=\"copy-code-btn flex items-center gap-1.5 px-3 py-1 text-xs font-bold bg-[#2f363d] text-gray-200 border-2 border-black dark:border-gray-500 rounded-lg shadow-neo-sm hover:translate-x-0.5 hover:translate-y-0.5 hover:shadow-none hover:bg-gray-700 transition-all cursor-pointer\" data-code=\"BEGIN%3B%0A%0A--%20Mengunci%20baris%20produk%20ID%2042%20agar%20nggak%20bisa%20diubah%20transaksi%20lain%0ASELECT%20id%2C%20stock%2C%20price%0AFROM%20products%0AWHERE%20id%20%3D%2042%0AFOR%20UPDATE%3B%0A%0A--%20Lakukan%20kalkulasi%20di%20aplikasi%0A--%20Update%20stok%20jika%20masih%20tersedia%0AUPDATE%20products%0ASET%20stock%20%3D%20stock%20-%201%0AWHERE%20id%20%3D%2042%3B%0A%0ACOMMIT%3B%20--%20Gembok%20dilepas%2C%20transaksi%20lain%20baru%20boleh%20masuk\" title=\"Salin kode\">\n      \u003Csvg class=\"w-3.5 h-3.5 copy-icon-svg\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n        \u003Cpath stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z\">\u003C/path>\n      \u003C/svg>\n      \u003Cspan class=\"copy-text\">Copy\u003C/span>\n    \u003C/button>\n  \u003C/div>\n  \u003Cdiv class=\"code-block-content p-4 overflow-x-auto text-sm font-mono leading-relaxed bg-[#24292e]\">\n    \u003Cpre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\">\u003Ccode>\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">BEGIN\u003C/span>\u003Cspan style=\"color:#E1E4E8\">;\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">-- Mengunci baris produk ID 42 agar nggak bisa diubah transaksi lain\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">SELECT\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id, stock, price\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">FROM\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> products\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">WHERE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 42\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">FOR\u003C/span>\u003Cspan style=\"color:#F97583\"> UPDATE\u003C/span>\u003Cspan style=\"color:#E1E4E8\">;\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">-- Lakukan kalkulasi di aplikasi\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">-- Update stok jika masih tersedia\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">UPDATE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> products\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">SET\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> stock \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> stock \u003C/span>\u003Cspan style=\"color:#F97583\">-\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 1\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">WHERE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 42\u003C/span>\u003Cspan style=\"color:#E1E4E8\">;\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">COMMIT\u003C/span>\u003Cspan style=\"color:#E1E4E8\">; \u003C/span>\u003Cspan style=\"color:#6A737D\">-- Gembok dilepas, transaksi lain baru boleh masuk\u003C/span>\u003C/span>\u003C/code>\u003C/pre>\n  \u003C/div>\n\u003C/div>\u003Cp>Kelebihannya jelas: aman. Kita dijamiin 100% \u003Cstrong>nggak ada data yang tumpang tindih\u003C/strong>, soalnya transaksi lain dipaksa ngantre (\u003Cem>blocking\u003C/em>).\u003C/p>\n\u003Cp>Tapi, ada harganya. \u003Cem>Throughput\u003C/em> bisa turun drastis kalau banyak \u003Cem>request\u003C/em> ngantre di \u003Cem>row\u003C/em> yang sama. Dan kalau kita kurang hati-hati ngatur urutan penguncian, sistem bisa kena \u003Cem>Deadlock\u003C/em> (kebuntuan) di mana dua transaksi saling nunggu selamanya.\u003C/p>\n\u003Ch2 id=\"terus-optimistic-locking-kerjanya-gimana\">Terus, \u003Cem>Optimistic Locking\u003C/em> Kerjanya Gimana?\u003C/h2>\n\u003Cp>Beda sama yang tadi, \u003Cem>Optimistic Locking\u003C/em> sebenernya \u003Cstrong>nggak ngunci apa pun secara fisik\u003C/strong>. Pendekatan ini ngandelin logika aplikasi, dengan bantuan kolom penanda versi kayak \u003Ccode>version INT\u003C/code> atau \u003Ccode>updated_at TIMESTAMP\u003C/code>.\u003C/p>\n\u003Cp>Alurnya kira-kira gini:\u003C/p>\n\u003Col>\n\u003Cli>Baca data beserta versinya sekarang.\n\u003Cdiv class=\"code-block-wrapper my-6 not-prose rounded-xl border-2 border-black dark:border-gray-600 shadow-neo overflow-hidden bg-[#24292e] text-[#e1e4e8] transition-all\">\n  \u003Cdiv class=\"code-block-header flex items-center justify-between px-4 py-2.5 bg-[#1f2428] border-b-2 border-black dark:border-gray-600 font-mono text-xs font-bold text-gray-300 select-none\">\n    \u003Cdiv class=\"flex items-center gap-2\">\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ff5f56] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ffbd2e] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#27c93f] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"ml-2 font-mono font-bold text-xs uppercase tracking-wider text-gray-300\">SQL\u003C/span>\n    \u003C/div>\n    \u003Cbutton type=\"button\" class=\"copy-code-btn flex items-center gap-1.5 px-3 py-1 text-xs font-bold bg-[#2f363d] text-gray-200 border-2 border-black dark:border-gray-500 rounded-lg shadow-neo-sm hover:translate-x-0.5 hover:translate-y-0.5 hover:shadow-none hover:bg-gray-700 transition-all cursor-pointer\" data-code=\"SELECT%20id%2C%20stock%2C%20version%20FROM%20products%20WHERE%20id%20%3D%2042%3B%0A--%20Hasil%3A%20stock%20%3D%2010%2C%20version%20%3D%201\" title=\"Salin kode\">\n      \u003Csvg class=\"w-3.5 h-3.5 copy-icon-svg\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n        \u003Cpath stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z\">\u003C/path>\n      \u003C/svg>\n      \u003Cspan class=\"copy-text\">Copy\u003C/span>\n    \u003C/button>\n  \u003C/div>\n  \u003Cdiv class=\"code-block-content p-4 overflow-x-auto text-sm font-mono leading-relaxed bg-[#24292e]\">\n    \u003Cpre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\">\u003Ccode>\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">SELECT\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id, stock, \u003C/span>\u003Cspan style=\"color:#F97583\">version\u003C/span>\u003Cspan style=\"color:#F97583\"> FROM\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> products \u003C/span>\u003Cspan style=\"color:#F97583\">WHERE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 42\u003C/span>\u003Cspan style=\"color:#E1E4E8\">;\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">-- Hasil: stock = 10, version = 1\u003C/span>\u003C/span>\u003C/code>\u003C/pre>\n  \u003C/div>\n\u003C/div>\u003C/li>\n\u003Cli>Hitung di aplikasi, terus simpan cuma kalau versinya belum berubah.\n\u003Cdiv class=\"code-block-wrapper my-6 not-prose rounded-xl border-2 border-black dark:border-gray-600 shadow-neo overflow-hidden bg-[#24292e] text-[#e1e4e8] transition-all\">\n  \u003Cdiv class=\"code-block-header flex items-center justify-between px-4 py-2.5 bg-[#1f2428] border-b-2 border-black dark:border-gray-600 font-mono text-xs font-bold text-gray-300 select-none\">\n    \u003Cdiv class=\"flex items-center gap-2\">\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ff5f56] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ffbd2e] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#27c93f] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"ml-2 font-mono font-bold text-xs uppercase tracking-wider text-gray-300\">SQL\u003C/span>\n    \u003C/div>\n    \u003Cbutton type=\"button\" class=\"copy-code-btn flex items-center gap-1.5 px-3 py-1 text-xs font-bold bg-[#2f363d] text-gray-200 border-2 border-black dark:border-gray-500 rounded-lg shadow-neo-sm hover:translate-x-0.5 hover:translate-y-0.5 hover:shadow-none hover:bg-gray-700 transition-all cursor-pointer\" data-code=\"UPDATE%20products%0ASET%20stock%20%3D%20stock%20-%201%2C%20version%20%3D%20version%20%2B%201%0AWHERE%20id%20%3D%2042%20AND%20version%20%3D%201%3B\" title=\"Salin kode\">\n      \u003Csvg class=\"w-3.5 h-3.5 copy-icon-svg\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n        \u003Cpath stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z\">\u003C/path>\n      \u003C/svg>\n      \u003Cspan class=\"copy-text\">Copy\u003C/span>\n    \u003C/button>\n  \u003C/div>\n  \u003Cdiv class=\"code-block-content p-4 overflow-x-auto text-sm font-mono leading-relaxed bg-[#24292e]\">\n    \u003Cpre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\">\u003Ccode>\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">UPDATE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> products\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">SET\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> stock \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> stock \u003C/span>\u003Cspan style=\"color:#F97583\">-\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 1\u003C/span>\u003Cspan style=\"color:#E1E4E8\">, \u003C/span>\u003Cspan style=\"color:#F97583\">version\u003C/span>\u003Cspan style=\"color:#F97583\"> =\u003C/span>\u003Cspan style=\"color:#F97583\"> version\u003C/span>\u003Cspan style=\"color:#F97583\"> +\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 1\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">WHERE\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> id \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 42\u003C/span>\u003Cspan style=\"color:#F97583\"> AND\u003C/span>\u003Cspan style=\"color:#F97583\"> version\u003C/span>\u003Cspan style=\"color:#F97583\"> =\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 1\u003C/span>\u003Cspan style=\"color:#E1E4E8\">;\u003C/span>\u003C/span>\u003C/code>\u003C/pre>\n  \u003C/div>\n\u003C/div>\u003C/li>\n\u003Cli>Cek jumlah \u003Cem>row\u003C/em> yang kena dampak (\u003Cem>rows affected\u003C/em>). Kalau hasilnya 1, berarti berhasil dan versinya naik jadi 2. Kalau hasilnya 0, artinya ada transaksi lain yang nyimpen lebih dulu—aplikasi bisa ngebatalin atau nyoba \u003Cem>retry\u003C/em>.\u003C/li>\n\u003C/ol>\n\u003Cp>Kelebihannya, ini cepat dan nggak ada proses yang diblokir (\u003Cem>non-blocking\u003C/em>). Cocok banget buat aplikasi yang beban bacanya tinggi (\u003Cem>high read throughput\u003C/em>).\u003C/p>\n\u003Cp>Kekurangannya, kalau tingkat bentrokan (\u003Cem>contention\u003C/em>) tinggi—misal rebutan 1 tiket konser—mayoritas transaksi bakal gagal. \u003Cem>Retry\u003C/em> beruntun itulah yang akhirnya ngabisin \u003Cem>CPU\u003C/em> kalian. 😅\u003C/p>\n\u003Ch2 id=\"contoh-kode-di-python-sqlalchemy\">Contoh Kode di Python / SQLAlchemy\u003C/h2>\n\u003Cp>Berikut perbandingannya pakai \u003Ca href=\"https://docs.sqlalchemy.org/en/20/orm/queryguide/concurrency.html\">SQLAlchemy Concurrency\u003C/a>:\u003C/p>\n\n\u003Cdiv class=\"code-block-wrapper my-6 not-prose rounded-xl border-2 border-black dark:border-gray-600 shadow-neo overflow-hidden bg-[#24292e] text-[#e1e4e8] transition-all\">\n  \u003Cdiv class=\"code-block-header flex items-center justify-between px-4 py-2.5 bg-[#1f2428] border-b-2 border-black dark:border-gray-600 font-mono text-xs font-bold text-gray-300 select-none\">\n    \u003Cdiv class=\"flex items-center gap-2\">\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ff5f56] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#ffbd2e] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"w-3 h-3 rounded-full bg-[#27c93f] border border-black/40 inline-block\">\u003C/span>\n      \u003Cspan class=\"ml-2 font-mono font-bold text-xs uppercase tracking-wider text-gray-300\">PYTHON\u003C/span>\n    \u003C/div>\n    \u003Cbutton type=\"button\" class=\"copy-code-btn flex items-center gap-1.5 px-3 py-1 text-xs font-bold bg-[#2f363d] text-gray-200 border-2 border-black dark:border-gray-500 rounded-lg shadow-neo-sm hover:translate-x-0.5 hover:translate-y-0.5 hover:shadow-none hover:bg-gray-700 transition-all cursor-pointer\" data-code=\"from%20sqlalchemy.orm%20import%20Session%0Afrom%20sqlalchemy%20import%20select%0Afrom%20models%20import%20Product%0A%0A%23%201.%20Implementasi%20Pessimistic%20Locking%0Adef%20buy_product_pessimistic(db%3A%20Session%2C%20product_id%3A%20int%2C%20quantity%3A%20int)%3A%0A%20%20%20%20%23%20Menggunakan%20with_for_update()%20untuk%20memicu%20'SELECT%20...%20FOR%20UPDATE'%0A%20%20%20%20product%20%3D%20db.execute(%0A%20%20%20%20%20%20%20%20select(Product)%0A%20%20%20%20%20%20%20%20.where(Product.id%20%3D%3D%20product_id)%0A%20%20%20%20%20%20%20%20.with_for_update()%0A%20%20%20%20).scalar_one()%0A%0A%20%20%20%20if%20product.stock%20%3C%20quantity%3A%0A%20%20%20%20%20%20%20%20raise%20ValueError(%22Stok%20nggak%20mencukupi!%22)%0A%0A%20%20%20%20product.stock%20-%3D%20quantity%0A%20%20%20%20db.commit()%0A%20%20%20%20return%20product%0A%0A%23%202.%20Implementasi%20Optimistic%20Locking%0Adef%20buy_product_optimistic(db%3A%20Session%2C%20product_id%3A%20int%2C%20quantity%3A%20int)%3A%0A%20%20%20%20%23%20Baca%20data%20tanpa%20lock%20fisik%0A%20%20%20%20product%20%3D%20db.execute(%0A%20%20%20%20%20%20%20%20select(Product).where(Product.id%20%3D%3D%20product_id)%0A%20%20%20%20).scalar_one()%0A%0A%20%20%20%20if%20product.stock%20%3C%20quantity%3A%0A%20%20%20%20%20%20%20%20raise%20ValueError(%22Stok%20nggak%20mencukupi!%22)%0A%0A%20%20%20%20current_version%20%3D%20product.version%0A%0A%20%20%20%20%23%20Update%20bersyarat%20mencocokkan%20nomor%20versi%0A%20%20%20%20result%20%3D%20db.query(Product).filter(%0A%20%20%20%20%20%20%20%20Product.id%20%3D%3D%20product_id%2C%0A%20%20%20%20%20%20%20%20Product.version%20%3D%3D%20current_version%0A%20%20%20%20).update(%7B%0A%20%20%20%20%20%20%20%20%22stock%22%3A%20product.stock%20-%20quantity%2C%0A%20%20%20%20%20%20%20%20%22version%22%3A%20current_version%20%2B%201%0A%20%20%20%20%7D)%0A%0A%20%20%20%20if%20result%20%3D%3D%200%3A%0A%20%20%20%20%20%20%20%20db.rollback()%0A%20%20%20%20%20%20%20%20raise%20ValueError(%22Bentrokan%20data%20terdeteksi!%20Silakan%20ulangi%20transaksi.%22)%0A%0A%20%20%20%20db.commit()%0A%20%20%20%20return%20product\" title=\"Salin kode\">\n      \u003Csvg class=\"w-3.5 h-3.5 copy-icon-svg\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\">\n        \u003Cpath stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z\">\u003C/path>\n      \u003C/svg>\n      \u003Cspan class=\"copy-text\">Copy\u003C/span>\n    \u003C/button>\n  \u003C/div>\n  \u003Cdiv class=\"code-block-content p-4 overflow-x-auto text-sm font-mono leading-relaxed bg-[#24292e]\">\n    \u003Cpre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\">\u003Ccode>\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">from\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> sqlalchemy.orm \u003C/span>\u003Cspan style=\"color:#F97583\">import\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> Session\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">from\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> sqlalchemy \u003C/span>\u003Cspan style=\"color:#F97583\">import\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> select\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">from\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> models \u003C/span>\u003Cspan style=\"color:#F97583\">import\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> Product\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\"># 1. Implementasi Pessimistic Locking\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">def\u003C/span>\u003Cspan style=\"color:#B392F0\"> buy_product_pessimistic\u003C/span>\u003Cspan style=\"color:#E1E4E8\">(db: Session, product_id: \u003C/span>\u003Cspan style=\"color:#79B8FF\">int\u003C/span>\u003Cspan style=\"color:#E1E4E8\">, quantity: \u003C/span>\u003Cspan style=\"color:#79B8FF\">int\u003C/span>\u003Cspan style=\"color:#E1E4E8\">):\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">    # Menggunakan with_for_update() untuk memicu 'SELECT ... FOR UPDATE'\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    product \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> db.execute(\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        select(Product)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        .where(Product.id \u003C/span>\u003Cspan style=\"color:#F97583\">==\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product_id)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        .with_for_update()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    ).scalar_one()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">    if\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product.stock \u003C/span>\u003Cspan style=\"color:#F97583\"><\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> quantity:\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">        raise\u003C/span>\u003Cspan style=\"color:#79B8FF\"> ValueError\u003C/span>\u003Cspan style=\"color:#E1E4E8\">(\u003C/span>\u003Cspan style=\"color:#9ECBFF\">\"Stok nggak mencukupi!\"\u003C/span>\u003Cspan style=\"color:#E1E4E8\">)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    product.stock \u003C/span>\u003Cspan style=\"color:#F97583\">-=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> quantity\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    db.commit()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">    return\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\"># 2. Implementasi Optimistic Locking\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">def\u003C/span>\u003Cspan style=\"color:#B392F0\"> buy_product_optimistic\u003C/span>\u003Cspan style=\"color:#E1E4E8\">(db: Session, product_id: \u003C/span>\u003Cspan style=\"color:#79B8FF\">int\u003C/span>\u003Cspan style=\"color:#E1E4E8\">, quantity: \u003C/span>\u003Cspan style=\"color:#79B8FF\">int\u003C/span>\u003Cspan style=\"color:#E1E4E8\">):\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">    # Baca data tanpa lock fisik\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    product \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> db.execute(\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        select(Product).where(Product.id \u003C/span>\u003Cspan style=\"color:#F97583\">==\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product_id)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    ).scalar_one()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">    if\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product.stock \u003C/span>\u003Cspan style=\"color:#F97583\"><\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> quantity:\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">        raise\u003C/span>\u003Cspan style=\"color:#79B8FF\"> ValueError\u003C/span>\u003Cspan style=\"color:#E1E4E8\">(\u003C/span>\u003Cspan style=\"color:#9ECBFF\">\"Stok nggak mencukupi!\"\u003C/span>\u003Cspan style=\"color:#E1E4E8\">)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    current_version \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product.version\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#6A737D\">    # Update bersyarat mencocokkan nomor versi\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    result \u003C/span>\u003Cspan style=\"color:#F97583\">=\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> db.query(Product).filter(\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        Product.id \u003C/span>\u003Cspan style=\"color:#F97583\">==\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product_id,\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        Product.version \u003C/span>\u003Cspan style=\"color:#F97583\">==\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> current_version\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    ).update({\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#9ECBFF\">        \"stock\"\u003C/span>\u003Cspan style=\"color:#E1E4E8\">: product.stock \u003C/span>\u003Cspan style=\"color:#F97583\">-\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> quantity,\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#9ECBFF\">        \"version\"\u003C/span>\u003Cspan style=\"color:#E1E4E8\">: current_version \u003C/span>\u003Cspan style=\"color:#F97583\">+\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 1\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    })\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">    if\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> result \u003C/span>\u003Cspan style=\"color:#F97583\">==\u003C/span>\u003Cspan style=\"color:#79B8FF\"> 0\u003C/span>\u003Cspan style=\"color:#E1E4E8\">:\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">        db.rollback()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">        raise\u003C/span>\u003Cspan style=\"color:#79B8FF\"> ValueError\u003C/span>\u003Cspan style=\"color:#E1E4E8\">(\u003C/span>\u003Cspan style=\"color:#9ECBFF\">\"Bentrokan data terdeteksi! Silakan ulangi transaksi.\"\u003C/span>\u003Cspan style=\"color:#E1E4E8\">)\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#E1E4E8\">    db.commit()\u003C/span>\u003C/span>\n\u003Cspan class=\"line\">\u003Cspan style=\"color:#F97583\">    return\u003C/span>\u003Cspan style=\"color:#E1E4E8\"> product\u003C/span>\u003C/span>\u003C/code>\u003C/pre>\n  \u003C/div>\n\u003C/div>\u003Cp>Di versi \u003Cem>optimistic\u003C/em>, kunci utamanya ada di klausa \u003Ccode>WHERE id = 42 AND version = 1\u003C/code>. Kalau versinya udah berubah duluan, update-nya nggak ngefek ke \u003Cem>row\u003C/em> mana pun, dan \u003Ccode>result\u003C/code> bakal bernilai 0. Cek inilah yang jadi pengganti \u003Cstrong>kunci fisik\u003C/strong>.\u003C/p>\n\u003Ch2 id=\"kapan-pakai-yang-mana-sih\">Kapan Pakai yang Mana, Sih?\u003C/h2>\n\u003Cp>Gampangnya, lihat seberapa sering bentrokan datanya terjadi.\u003C/p>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth align=\"left\">Kriteria\u003C/th>\n\u003Cth align=\"left\">\u003Cem>Pessimistic Locking\u003C/em>\u003C/th>\n\u003Cth align=\"left\">\u003Cem>Optimistic Locking\u003C/em>\u003C/th>\n\u003C/tr>\n\u003C/thead>\n\u003Ctbody>\u003Ctr>\n\u003Ctd align=\"left\">Tingkat Bentrokan\u003C/td>\n\u003Ctd align=\"left\">Tinggi (banyak yang rebutan 1 \u003Cem>row\u003C/em>).\u003C/td>\n\u003Ctd align=\"left\">Rendah sampai sedang.\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd align=\"left\">Karakteristik Trafik\u003C/td>\n\u003Ctd align=\"left\">Transaksi finansial, \u003Cem>flash sale\u003C/em>, \u003Cem>booking\u003C/em>.\u003C/td>\n\u003Ctd align=\"left\">Profil \u003Cem>user\u003C/em>, edit blog, katalog umum.\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd align=\"left\">Biaya Kegagalan\u003C/td>\n\u003Ctd align=\"left\">Antrean waktu tunggu (\u003Cem>blocking latency\u003C/em>).\u003C/td>\n\u003Ctd align=\"left\">Biaya komputasi buat \u003Cem>retry\u003C/em>.\u003C/td>\n\u003C/tr>\n\u003Ctr>\n\u003Ctd align=\"left\">Mekanisme\u003C/td>\n\u003Ctd align=\"left\">Kunci fisik database (\u003Ccode>FOR UPDATE\u003C/code>).\u003C/td>\n\u003Ctd align=\"left\">Kolom \u003Cem>version\u003C/em> / \u003Cem>timestamp\u003C/em> di logika aplikasi.\u003C/td>\n\u003C/tr>\n\u003C/tbody>\u003C/table>\n\u003Cp>Jadi, buat persaingan tinggi yang butuh integritas mutlak, pakai \u003Cem>pessimistic\u003C/em>. Buat trafik yang didominasi baca dengan konflik jarang, \u003Cem>optimistic\u003C/em> jauh lebih enteng.\u003C/p>\n\u003Ch2 id=\"jadi-mana-yang-harus-kita-pilih\">Jadi, Mana yang Harus Kita Pilih?\u003C/h2>\n\u003Cp>Nggak ada solusi tunggal yang sempurna buat semua kasus. Yang penting, kita paham dulu karakter transaksi di aplikasi sendiri.\u003C/p>\n\u003Cp>Pakai \u003Cem>Pessimistic Locking\u003C/em> pas integritas mutlak tanpa toleransi \u003Cem>retry\u003C/em> bener-bener dibutuhkan di tengah persaingan tinggi. Sebaliknya, manfaatkan \u003Cem>Optimistic Locking\u003C/em> biar sistem tetap gesit di transaksi yang risikonya bentrok rendah.\u003C/p>\n\u003Cp>Kalau salah pilih, \u003Cstrong>bukan cuma data yang kacau\u003C/strong>—\u003Cem>CPU\u003C/em> kalian juga bisa ikut nangis. Hehe.\u003C/p>\n\u003Cp>Selamat ber-\u003Cem>locking\u003C/em> ria, dan semoga transaksi kalian selalu selamat dari rebutan yang bikin pusing! 👋\u003C/p>\n","\u003Cul>\n\u003Cli>Race Condition dan Lost Update Problem muncul pas banyak pengguna ngedit \u003Cem>row\u003C/em> yang sama secara barengan.\u003C/li>\n\u003Cli>\u003Cem>Pessimistic Locking\u003C/em> ngunci data secara fisik di level database lewat \u003Ccode>SELECT ... FOR UPDATE\u003C/code>, cocok buat persaingan tinggi kayak \u003Cem>flash sale\u003C/em> tiket.\u003C/li>\n\u003Cli>\u003Cem>Optimistic Locking\u003C/em> main di kolom \u003Cem>version\u003C/em> atau \u003Cem>timestamp\u003C/em> tanpa ngunci \u003Cem>row\u003C/em>, pas buat trafik \u003Cem>high read\u003C/em> dengan frekuensi konflik rendah.\u003C/li>\n\u003Cli>Pemilihan strategi yang tepat ngejaga integritas data tanpa ngorbanin \u003Cem>throughput\u003C/em> aplikasi.\u003C/li>\n\u003C/ul>\n",[417,420,423,431],{"id":321,"title":322,"slug":323,"excerpt":324,"thumbnail_image":418,"tags":419},{"id":326},[328,329,330,331,332],{"id":86,"title":87,"slug":88,"excerpt":89,"thumbnail_image":421,"tags":422},{"id":91},[51,55,93,94,95,56,96],{"id":424,"title":425,"slug":426,"excerpt":427,"thumbnail_image":428,"tags":430},"44","Transactional Outbox Pattern: Solusi Konsistensi Database dan Message Broker Tanpa 2PC","transactional-outbox-pattern-konsistensi-database-message-broker","Pernah nggak kalian lihat pesanan udah masuk database, tapi email konfirmasinya nggak pernah kekirim? Itu gejala *dual-write problem*. Yuk, kita bedah Transactional Outbox Pattern biar data dan *event* kalian nggak lagi berselisih paham!",{"id":429},"e3c617fd-1486-4b82-b937-94fbec846c77",[51,129,56,52,128,55,54],{"id":432,"title":433,"slug":434,"excerpt":435,"thumbnail_image":436,"tags":438},"43","Dead Letter Queue (DLQ) & Retry Policy: Menyelamatkan Pesan Nyasar di RabbitMQ Tanpa Bikin Worker Macet","dead-letter-queue-retry-policy-rabbitmq-resilient-messaging","Pernah nggak sih, *worker* kalian nolak satu pesan terus-terusan sampai CPU melonjak 100%? Itu namanya *poison message loop*, jebakan klasik di RabbitMQ. Yuk, kita bahas cara pasang *retry policy* dan *dead letter queue* yang bener!",{"id":437},"6c0a7ead-4841-4073-b29e-df7ae0f2aa3c",[127,128,51,56,129,130,285],[440,444,447,450,453,456],{"text":441,"depth":442,"id":443},"Gimana Cara Orang Ngedit Dokumen Bareng?",2,"gimana-cara-orang-ngedit-dokumen-bareng",{"text":445,"depth":442,"id":446},"Apa Sih Pessimistic Locking Itu?","apa-sih-pessimistic-locking-itu",{"text":448,"depth":442,"id":449},"Terus, Optimistic Locking Kerjanya Gimana?","terus-optimistic-locking-kerjanya-gimana",{"text":451,"depth":442,"id":452},"Contoh Kode di Python / SQLAlchemy","contoh-kode-di-python-sqlalchemy",{"text":454,"depth":442,"id":455},"Kapan Pakai yang Mana, Sih?","kapan-pakai-yang-mana-sih",{"text":457,"depth":442,"id":458},"Jadi, Mana yang Harus Kita Pilih?","jadi-mana-yang-harus-kita-pilih",1791045073070]