| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Murthy Nunna <mnunna(at)fnal(dot)gov> |
| Cc: | "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org> |
| Subject: | Re: pg_dump -Are statistics saved? |
| Date: | 2023-11-28 00:45:45 |
| Message-ID: | 4040678.1701132345@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-admin |
Murthy Nunna <mnunna(at)fnal(dot)gov> 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
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Nikhil Ingale | 2023-11-28 04:00:20 | idle in transaction |
| Previous Message | David G. Johnston | 2023-11-28 00:31:47 | Re: pg_dump -Are statistics saved? |