In PostgreSQL you can create indexes concurrently, so the database doesn't have to go down to create a new index: https://www.postgresql.org/docs/current/sql-c

In PostgreSQL you can create indexes concurrently, so the database doesn't have to go down to create a new index: https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-CONCURRENTLY https://www.postgresql.org/docs/current/sql-createindex.html...