SELECT
t.tablename,
indexname,
c.reltuples AS num_rows,
100.0*pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(indexrelname)::text)/(pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(t.tablename)::text)+1)as ratio,
pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(t.tablename)::text) AS table_size_raw,
pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(indexrelname)::text) AS index_size_raw,
pg_size_pretty(pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(t.tablename)::text)) AS table_size,
pg_size_pretty(pg_relation_size(quote_ident(t.schemaname)::text||'.'||quote_ident(indexrelname)::text)) AS index_size,
CASE WHEN indisunique THEN 'Y'
ELSE 'N'
END AS UNIQUE,
idx_scan AS number_of_scans,
idx_tup_read AS tuples_read,
idx_tup_fetch AS tuples_fetched
FROM pg_tables t
LEFT OUTER JOIN pg_class c ON t.tablename=c.relname
LEFT OUTER JOIN
( SELECT c.relname AS ctablename, ipg.relname AS indexname, x.indnatts AS number_of_columns, idx_scan, idx_tup_read, idx_tup_fetch, indexrelname, indisunique FROM pg_index x
JOIN pg_class c ON c.oid = x.indrelid
JOIN pg_class ipg ON ipg.oid = x.indexrelid
JOIN pg_stat_all_indexes psai ON x.indexrelid = psai.indexrelid AND (psai.schemaname='public' or psai.schemaname='partitions') )
AS foo
ON t.tablename = foo.ctablename
WHERE (t.schemaname='public' or t.schemaname='partitions')
ORDER BY 5 desc, 6 desc
Compare ratio among partitions of same table to find bloated indexes - the one for current month is always bloated :).
czwartek, 18 lipca 2019
Checking for index bloat in Psotgresql
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