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In this post, I am sharing one script to find Index Usage Statistics of PostgreSQL Database.
This is a very useful script for DBA to find out the usage of indexes and size of indexes which help them for performance tuning activity.
For DBA, working with Indexes is always important tasks so I have already shared a couple of articles on PostgreSQL Indexes.
Duplicate Indexes:
Missing Indexes:
Expression Index:
BRIN Index:
In below script, You can also find occupied size of Indexes, Total tuple read and scan by Indexes.
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SELECT pt.tablename AS TableName ,t.indexname AS IndexName ,pc.reltuples AS TotalRows ,pg_size_pretty(pg_relation_size(quote_ident(pt.tablename)::text)) AS TableSize ,pg_size_pretty(pg_relation_size(quote_ident(t.indexrelname)::text)) AS IndexSize ,t.idx_scan AS TotalNumberOfScan ,t.idx_tup_read AS TotalTupleRead ,t.idx_tup_fetch AS TotalTupleFetched FROM pg_tables AS pt LEFT OUTER JOIN pg_class AS pc ON pt.tablename=pc.relname LEFT OUTER JOIN ( SELECT pc.relname AS TableName ,pc2.relname AS IndexName ,psai.idx_scan ,psai.idx_tup_read ,psai.idx_tup_fetch ,psai.indexrelname FROM pg_index AS pi JOIN pg_class AS pc ON pc.oid = pi.indrelid JOIN pg_class AS pc2 ON pc2.oid = pi.indexrelid JOIN pg_stat_all_indexes AS psai ON pi.indexrelid = psai.indexrelid )AS T ON pt.tablename = T.TableName WHERE pt.schemaname='public' ORDER BY 1; |
