Can I log query execution time in PostgreSQL 8.4?

Question

I want to log each query execution time which is run in a day.

For example like this,

2012-10-01 13:23:38 STATEMENT: SELECT * FROM pg_stat_database           


        

Answer 1

I believe OP was actually asking for execution duration, not the timestamp.

To include the duration in the log output, open pgsql//data/postgresql.conf, find the line that reads

#log_duration = off

and change it to

log_duration = on

If you can't find the given parameter, just add it in a new line in the file.

After saving the changes, restart the postgresql service, or just invoke

pg_ctl reload -D 

e.g.

pg_ctl reload -D /var/lib/pgsql/9.2/data/

to reload the configuration.