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Databases & messaging · #couchdb
Learn how to use CouchDB's _rev tokens to implement optimistic concurrency control, preventing data loss from concurrent writes and handling HTTP 409 conflicts.
Two offline clients edit the same CouchDB document. After replication, users see different data depending on which leaf revision CouchDB returns. Conflicts are not corruption—they are MVCC working as designed. Here is how to detect and resolve them deterministically.
Learn how to use CouchDB’s since/until flags to replicate only the changes that matter, with a concrete step‑by‑step example and notes on conflict handling and checkpoint durability.
Learn how to create a CouchDB design document that indexes a document field using MapReduce, query it efficiently, and avoid common pitfalls.
Mango lets you query CouchDB with JSON selectors instead of JavaScript map functions. Learn how indexes are created, how to verify they are used, and the write and disk trade-offs to plan for.
Learn how to pick the right CouchDB replication mode for a mobile app that works offline, balances bandwidth, battery, and latency, and verify the choice with simple checks.
Learn how to configure CouchDB continuous replication, verify it works, and avoid common pitfalls like misconfigured URLs and attachment stalls.
CouchDB views are lazily updated B-tree indexes, so queries can lag recent writes. Learn to measure the update‑sequence gap, pick the right stale parameter, and fix view indexing lag without full rebuilds.
Step‑by‑step guide to create a persistent replication job that keeps a source and target CouchDB database in sync, with verification and recovery tips.