Are PostgreSQL tables automatically re-indexed after an update?

Question

If I index a PostgreSQL table and then update it, do I need to re-index the table or is it automatically re-indexed?

Can someone provide a link to PostgreSQL documentation for further reading? I've got this so far: https://www.postgresql.org/docs/9.1/static/sql-createindex.html

Answer 1

indexes in PostgreSQL do not need maintenance or tuning

You do not need to re-index manually.

For more details, please also read https://www.postgresql.org/docs/current/static/monitoring-stats.html