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PostgreSQL 9 Administration Cookbook by Hannu Krosing, Simon Riggs

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Controlling automatic database maintenance

Autovacuum is enabled by default in PostgreSQL 9.0, and mostly does a great job of maintaining your PostgreSQL database. I say mostly because it doesn't know everything you do about the database, such as when would be the best time to perform maintenance actions.

Getting ready

Exercising control requires some thinking about what you actually want:

  • Which are the best times of day to do things? When are system resources more available?
  • Which days are quiet, and are which not?
  • Which tables are critical to the application, and which are not?

How to do it...

The first thing to do is to make sure autovacuum is switched on. You must have both the following parameters enabled in your postgresql.conf:

  • autovacuum = ...

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