| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Subbiah, Stalin" <SSubbiah(at)netopia(dot)com> |
| Cc: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Vacuum Verbose output |
| Date: | 2005-10-31 21:22:59 |
| Message-ID: | 19097.1130793779@sss.pgh.pa.us |
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| Lists: | pgsql-admin |
"Subbiah, Stalin" <SSubbiah(at)netopia(dot)com> writes:
> INFO: vacuuming "public.eventlog"
> INFO: index "ix_eventlog_eventtime" now contains 11465395 row versions
> in 77113 pages
> DETAIL: 8737797 index row versions were removed.
> Does it mean ix_eventlog_ index had 11.4mil row versions out of which
> 8.7mil were removed cause of deletes?
No, it says "now contains", ie those are the post-removal statistics.
> 33189 index pages have been deleted, 0 are currently reusable.
> Does it mean out of 77113 index pages, 33189 were deleted?
Yeah --- so almost half the space in the index is free space (more than
half according to the later report). Possibly you should be vacuuming
this table a bit more often...
> Why does index and table INFO reported twice with different row version
> numbers on a vacuum run.
Because it had to do two passes of row removal, due to not having enough
vacuum_mem to remember all the dead rows at once.
regards, tom lane
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