Web Reference: Feb 26, 2026 · PostgreSQL doesn't remember any information about modified rows in memory, so there is no limit on the number of rows locked at one time. However, locking a row might cause a disk write, e.g., SELECT FOR UPDATE modifies selected rows to mark them locked, and so will result in disk writes. Jul 13, 2025 · Row locks in PostgreSQL - how do they work? How can I debug problems with them? The answers with examples are here. Jun 23, 2018 · I'm new enough to Postgres, and I'm trying to figure out how to lock a specific row of a table. As an example, I have a table of users: In my backend, I want to select John and make sure that no other calls can update (or even select possibly) John's row until my transaction is complete.
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