pg_stat_statements enabled, but the table does not exist

Question

I've postgresql-9.4 up and running, and I've enabled pg_stat_statements module lately by the help of official documentation.

But I'm getting following error upon usage:

postgres=# SELECT * FROM pg_stat_statements; ERROR:  relation "pg_stat_statements" does not exist LINE 1: SELECT * FROM pg_stat_statements;   postgres=# SELECT pg_stat_statements_reset(); ERROR:  function pg_stat_statements_reset() does not exist LINE 1: SELECT pg_stat_statements_reset(); 

I'm logged in to psql with the postgres user. I've also checked the available extension lists:

postgres=# SELECT * FROM pg_available_extensions WHERE name = 'pg_stat_statements' ;         name        | default_version | installed_version |                          comment                           --------------------+-----------------+-------------------+-----------------------------------------------------------  pg_stat_statements | 1.2             |                   | track execution statistics of all SQL statements executed (1 row) 

And here's the results of the extension versions query:

postgres=# SELECT * FROM pg_available_extension_versions WHERE name = 'pg_stat_statements';         name        | version | installed | superuser | relocatable | schema | requires |                          comment                           --------------------+---------+-----------+-----------+-------------+--------+----------+-----------------------------------------------------------  pg_stat_statements | 1.2     | f         | t         | t           |        |          | track execution statistics of all SQL statements executed (1 row) 

Any help will be appreciated.

Answer 1

Extension isn't installed:

SELECT *  FROM pg_available_extensions  WHERE      name = 'pg_stat_statements' and      installed_version is not null; 

If the table is empty, create the extension:

CREATE EXTENSION pg_stat_statements;