PostgreSQL Index Usage Analysis

Question

Is there a tool or method to analyze Postgres, and determine what missing indexes should be created, and which unused indexes should be removed? I have a little experience doing

Answer 1

On the determine missing indexes approach....Nope. But there's some plans to make this easier in future release, like pseudo-indexes and machine readable EXPLAIN.

Currently, you'll need to EXPLAIN ANALYZE poor performing queries and then manually determine the best route. Some log analyzers like pgFouine can help determine the queries.

As far as an unused index, you can use something like the following to help identify them:

select * from pg_stat_all_indexes where schemaname <> 'pg_catalog';

This will help identify tuples read, scanned, fetched.

Answer 2

Another new and interesting tool for analyzing PostgreSQL is PgHero. It is more focused on tuning the database and makes numerous analysis and suggestions.

Answer 3

It can be found by using following query in postgres console

use db_name
select * from pg_stat_user_indexes;
select * from pg_statio_user_indexes;

For More Details https://www.postgresql.org/docs/current/monitoring-stats.html