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. 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. Learn how to effectively manage concurrent access to database records in Postgres using row locking techniques with practical SQL examples. ---...more
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