Enable pg_stat_statements for PostgreSQL

The pg_stat_statements module provides a means for tracking planning and execution statistics of all SQL statements executed by a server.

Modify PostgreSQL Configuration

The pg_stat_statements module must be loaded by adding pg_stat_statements to shared_preload_libraries in postgresql.conf, because it requires additional shared memory.

To enable pg_stat_statements, you need to modify the following PostgreSQL configuration in PostgreSQL configuration file (e.g. /etc/postgresql/12/main/postgresql.conf):

shared_preload_libraries = 'pg_stat_statements'
pg_stat_statements.track = all

Restart PostgreSQL

After you change the PostgreSQL configuration, you need to restart PostgreSQL to make the change effective.

Create pg_stat_statements Extension for Each Database

Currently, pg_stat_statements only tracks the statistics of the database where the extension is created. So you need to create the extension for each database.

CREATE EXTENSION IF NOT EXISTS pg_stat_statements;

You can use the Bytebase Batch Change feature to create the extension for all databases.

Check pg_stat_statements

SELECT count(*) FROM pg_stat_statements;

References

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