Get faster vacuums

posted Nov 5, 2014, 5:30 PM by Sachchida Ojha   [ updated Nov 5, 2014, 6:16 PM ]
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The amount of memory pg uses for vacuuming by default is super low. You can increase it and thus dramatically speed up vacuuming by doing something like:

How to find current setting?

sachi=# show maintenance_work_mem
sachi-# ;
(1 row)

sachi=# select name, setting, unit from pg_settings where name='maintenance_work_mem';
         name         | setting | unit 
 maintenance_work_mem | 65536   | kB
(1 row)

Specifies the maximum amount of memory (in kilobytes) to be used in maintenance operations, such as VACUUM or CREATE INDEX. Since only one of these operations can be executed at a time by a database session, and an installation normally doesn't have very many of them happening concurrently, it's safe to set this value significantly larger than work_mem. Larger settings may improve performance for vacuuming and for restoring database dumps.

Set Classifications

Now set the maintenance_work_mem to 512MB.

sachi=# set maintenance_work_mem = 524288
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