Postgres: How can I see all SQL statements being executed by the database server?

Question

I'm in the process of reviewing every SQL statement that an application makes against the database, for performance reasons. Is there an easy way to log all statements that are executed by the PostgreSQL database server? Thanks.

score 31 · Accepted Answer · edited Mar 21 '13 at 12:37

31

The config option you're looking for is log_statement = "all" (if you just want the statements), or log_min_statement_duration = <some number> if you're just after "slow" queries (for some value of "slow"). See http://www.postgresql.org/docs/current/static/runtime-config-logging.html for more details on logging configuration.

edited Mar 21 '13 at 12:37

Craig Ringer

11,525

answered Jun 04 '09 at 23:07

womble

98,245

score 5 · Answer 2 · answered Mar 21 '13 at 12:28

The auto_explain module is very useful for this. It'll not only log the statements, it'll log their execution plans and can even log statements run within PL/PgSQL functions. The performance hit is fairly low unless you enable analyze, in which case you incur a fair bit of timing overhead for all queries.

See auto_explain in the documentation.

score 3 · Answer 3 · edited May 10 '18 at 17:35

3

Of course, you can detect slowest queries by yourself, but I advise you to use pgFouine — a PostgreSQL log analyzer. It`s easy to install and really useful.

Sample reports: here and here.

edited May 10 '18 at 17:35

Gregory Arenius

103

answered Jun 04 '09 at 21:53

Severe_admin

338

Postgres: How can I see all SQL statements being executed by the database server?

3 Answers3