May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Killing idle sessions
In PostgreSQL, a session or a transaction can basically live almost forever. In some cases, this has been a problem because transactions were kept open for too long. Usually, this was due to a bug. The trouble is this: insanely long transactions can cause cleanup problems and table bloat can occur. The uncontrolled growth of a table (table bloat) naturally leads to performance problems and unhappy end users.
Starting with PostgreSQL 9.6, it is possible to limit the duration a database connection is allowed to spend inside a transaction without performing real work. Here is how it works:
test=# SET idle_in_transaction_session_timeout TO 2500; SET test=# BEGIN; BEGIN test=# SELECT 1; ?column? ---------- 1 (1 row)
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