PostgreSQL Performance Tuning Tips: Vacuum and Indexing

Why is Autovacuum Important?

PostgreSQL uses MVCC (Multi-Version Concurrency Control). Updated or deleted data is not immediately deleted from the disk; it remains as a "dead tuple". Autovacuum cleans up this dead data, saving space and improving performance.

Advanced Indexing Strategies

You shouldn't just use B-Tree; depending on your data type, you should also use GIN or BRIN indexes.

-- GIN index for JSONB data
CREATE INDEX idx_user_data ON users USING GIN (data);

Don't forget to use the "CONCURRENTLY" keyword when creating an index on large tables, otherwise your table will be locked!