Murthy Nunna <mnunna@xxxxxxxx> writes:
> The pg_dump (used verbose) log said "pg_dump: reading extended statistics".
> Does it mean it saved statistics and they can be restored with pg_restore?
What that means is that it will output clones of any CREATE STATISTICS
commands you may have issued.
> If not, is it necessary to run ANALYZE after pg_restore?
That has always been necessary after a dump/restore, and still is.
The pg_dump man page makes this clear enough, I should think:
The dump file produced by pg_dump does not contain the statistics used
by the optimizer to make query planning decisions. Therefore, it is
wise to run ANALYZE after restoring from a dump file to ensure optimal
performance; see Section 25.1.3 and Section 25.1.6 for more
information.
regards, tom lane
