| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "George Pavlov" <gpavlov(at)mynewplace(dot)com> |
| Cc: | "Brad Nicholson" <bnichols(at)ca(dot)afilias(dot)info>, pgsql-sql(at)postgresql(dot)org, jim(at)contactbda(dot)com |
| Subject: | Re: finding unused indexes? |
| Date: | 2007-10-10 13:35:59 |
| Message-ID: | 15003.1192023359@sss.pgh.pa.us |
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| Lists: | pgsql-sql |
"George Pavlov" <gpavlov(at)mynewplace(dot)com> writes:
> so is it safe to say that an index that has
> pg_stat_user_indexes.idx_scan, pg_stat_user_indexes.idx_tup_read, and
> pg_stat_user_indexes.idx_tup_fetch all equal to 0 has not been used
> (since stats have been reset)?
> i have a bunch of those and all of them have
> pg_statio_user_indexes.idx_blks_read > 0 and most of those have
> pg_statio_user_indexes.idx_blks_hit > 0. when/why would that happen?
You have stats_block_level turned on, but not stats_tuple_level?
You have a lot of searches that find no rows?
regards, tom lane
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