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May 17, 2026, 11:40 PM

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Paweł Domański
2026-05-18 06:40:19 +00:00
commit 64944cf004
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inbox/DataBase/PostgreSQL/queries/wasted_index_space.sql
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/* Requires PostgreSQL 8.4 or greater */
WITH s AS(
SELECT SUM(pg_relation_size(quote_ident(n.nspname) || '.' || quote_ident(c.relname))::bigint) AS table_size,
pg_size_pretty(SUM(pg_relation_size(quote_ident(n.nspname) || '.' || quote_ident(c.relname))::bigint)::bigint) AS table_size_pretty
FROM pg_class c
JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE c.relkind = 'r'
AND c.relname NOT LIKE 'pg_%'
AND c.relname NOT LIKE 'sql%'
)
SELECT s.table_size,
s.table_size_pretty,
SUM(pg_relation_size(quote_ident(n.nspname) || '.' || quote_ident(i.indexrelname))::bigint) AS unused_idx_size,
pg_size_pretty(SUM(pg_relation_size(quote_ident(n.nspname) || '.' || quote_ident(i.indexrelname))::bigint)::bigint) AS unused_idx_size_pretty,
pg_database_size(current_database()) as db_size,
pg_size_pretty(pg_database_size(current_database()))as db_size_pretty,
pg_size_pretty(pg_database_size(current_database()) - SUM(pg_relation_size(quote_ident(n.nspname) || '.' || quote_ident(i.indexrelname))::bigint)::bigint) as db_minus_wasted_space
FROM s, pg_stat_all_indexes i
JOIN pg_class c ON (c.oid = i.relid)
JOIN pg_namespace n ON (n.oid = c.relnamespace)
JOIN pg_index idx ON (idx.indexrelid = i.indexrelid )
WHERE i.idx_scan = 0
AND NOT idx.indisprimary
AND NOT idx.indisunique
GROUP BY table_size, table_size_pretty;