November 2015
Beginner
464 pages
9h 46m
English
Content preview from Learning PostgreSQLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Managing database locks
Lock management is essential in a production environment and should be monitored closely. There are several types of locks, such as deadlocks, advisory locks, and table locks. For tables, there are several lock modes; the only mode that blocks SELECT statements is ACCESS EXCLUSIVE. Access to the exclusive mode can be acquired through statements that alter the table's physical structure, such as ALTER, DROP, TRUNCATE, VACUUM FULL, CLUSTER, and REINDEX and finally using the LOCK command in the ACCESS EXCLUSIVE mode.
The table's looks might cause some queries to wait until the lock is lifted, depending on the lock mode and the query type. Also, some queries may wait for a long time due to keeping the transaction uncommitted ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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