PostgreSQL version:

log_directory

When logging_collector is enabled, this parameter determines the directory in which log files will be created. It can be specified as an absolute path, or relative to the cluster data directory. This parameter can only be set in the postgresql.conf file or on the server command line. The default is log.

Recommendations

If you are having PostgreSQL keep its own activity logs on a production server, it's probably a good idea to locate them on separate storage from the database and transaction log.

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