January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Table-level locks
Tables can be locked in several locking modes. The syntax of the LOCK statement is as follows:
LOCK [ TABLE ] [ ONLY ] name [ * ] [, ...] [ IN lockmode MODE ] [ NOWAIT ]where lockmode is one of: ACCESS SHARE | ROW SHARE | ROW EXCLUSIVE | SHARE UPDATE EXCLUSIVE | SHARE | SHARE ROW EXCLUSIVE | EXCLUSIVE | ACCESS EXCLUSIVE
PostgreSQL locks the table implicitly when invoking an SQL command. It locks the table using the least restrictive mode to increase concurrency. When the developer desires a more restrictive lock, then the LOCK statement can be used.
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