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
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