PostgreSQL 7.4.11 Documentation
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# 18.4. Database Configuration

Recall from Section 16.4 that the PostgreSQL server provides a large number of run-time configuration variables. You can set database-specific default values for many of these settings.

For example, if for some reason you want to disable the GEQO optimizer for a given database, you'd ordinarily have to either disable it for all databases or make sure that every connecting client is careful to issue `SET geqo TO off;`. To make this setting the default you can execute the command

    ALTER DATABASE mydb SET geqo TO off;

This will save the setting (but not set it immediately) and in subsequent connections it will appear as though `SET geqo TO off;` had been called right before the session started. Note that users can still alter this setting during the session; it will only be the default. To undo any such setting, use `ALTER DATABASE `dbname` RESET `varname`;`.

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