22.4. Database Configuration
Recall from Chapter 19 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 within a particular
database, you can execute the command:
ALTER DATABASE mydb SET geqo TO off;
This will save the setting (but not set it immediately). In
subsequent connections to this database it will appear as though
SET geqo TO off;
had been executed just before the
session started.
Note that users can still alter this setting during their sessions; it
will only be the default. To undo any such setting, use
ALTER DATABASE
.
dbname
RESET
varname