How to Keep Transactions Short and Scoped

Long transactions are a common source of lock contention, replication lag, and unpredictable performance in high-traffic databases. Here are a few tips for keeping transactions short and tightly scoped:

• Locks live for the duration of a transaction: Every row you read or write stays locked until commit. Longer transactions increase the risk of blocking others, especially for frequently accessed rows or tables. (MySQL & Postgres)
• Autocommit helps avoid lingering locks: For simple statements (such as INSERTs and SELECTs), autocommit prevents lingering locks. Only wrap multiple statements in a transaction when atomicity is required. (MySQL & Postgres)
• Minimize client round-trips: Avoid starting a transaction and waiting for user input or external service calls before finishing it. (MySQL & Postgres)
• Avoid idle-in-transaction states: Enforce timeouts with a pooler, and use pg_stat_activity to spot long-lived connections. (Postgres)
• Keep transactions focused: Separate reads from writes unless snapshot consistency is required, doing so shortens lock time and improves cacheability. (MySQL & Postgres)

Shorter transactions mean fewer locks, faster queries, and fewer deadlocks. Readyset takes it further by caching repeat reads off the critical path, thereby reducing the load on the primary.

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