On 2015-05-22 09:41:57 -0400, Melvin Davidson wrote:
> I'd like to share those queries with the community, as I know there must be
> others out there with the same problem.
>
> /* useless_indexes.sql */
> SELECT
> idstat.schemaname AS schema,
> idstat.relname AS table_name,
> indexrelname AS index_name,
> idstat.idx_scan AS times_used,
> pg_size_pretty(pg_relation_size(quote_ident(idstat.schemaname) || '.' ||
> quote_ident(idstat.relname))) AS table_size,
> pg_size_pretty(pg_relation_size(quote_ident(idstat.schemaname) || '.' ||
> quote_ident(indexrelname))) AS index_size,
> n_tup_upd + n_tup_ins + n_tup_del as num_writes,
> indexdef AS definition
> FROM pg_stat_user_indexes AS idstat
> JOIN pg_indexes ON indexrelname = indexname
> JOIN pg_stat_user_tables AS tabstat ON idstat.relname = tabstat.relname
> WHERE idstat.idx_scan < 200
> AND indexdef !~* 'unique'
> ORDER BY idstat.schemaname,
> idstat.relname,
> indexrelname;
Thanks, that's useful.
However, it doesn't quite work if there are indexes with the same name
in different schemas. Better join on the schemaname, too:
FROM pg_stat_user_indexes AS idstat
JOIN pg_indexes AS idx ON indexrelname = indexname and idstat.schemaname = idx.schemaname
JOIN pg_stat_user_tables AS tabstat ON idstat.relname = tabstat.relname and idstat.schemaname = tabstat.schemaname
(for some reason that makes it a lot slower, though)
hp
--
_ | Peter J. Holzer | I want to forget all about both belts and
|_|_) | | suspenders; instead, I want to buy pants
| | | hjp@hjp.at | that actually fit.
__/ | http://www.hjp.at/ | -- http://noncombatant.org/
