May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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The good thing about the aforementioned recipe is that it returns a value in about the same time, no matter how big the table is. The bad thing about it is that pg_relation_size() requests a lock on the table, so if any other user has an AccessExclusiveLock lock on the table, then the table size estimate will wait for the lock to be released before returning a value.
Err... so what is an AccessExclusiveLock lock? While performing a SQL maintenance action, such as changing the data type of a column, PostgreSQL will lock out all other actions on that table, including pg_relation_size, which takes a lock in the AccessShareLock mode. For me, a typical case is when I issue some form of SQL maintenance action, such as ALTER TABLE ...
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