February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Deciphering database locks
It's not uncommon for various elements of the database to block each other. Queries can lock shared resources, system maintenance can temporarily prevent a transaction from committing; the list is endless. As a result, a critical aspect of troubleshooting a PostgreSQL system is tracking down blocked sessions, and what might be preventing normal operation.
There are two very powerful ways to decipher locks within PostgreSQL in the pg_locks view and the PostgreSQL 9.6+ pg_blocking_pids function. This recipe will demonstrate why these approaches are so useful.
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