postgresql - Vacuum analyze after huge deleting of rows not freeing space in postgres -


i delete huge amount of rows in our postgres database , ran vacuum analyze later on.

i noticed disk usage did not moved in aws rds console.

tried running query, based on table size did not move well.

select *, pg_size_pretty(total_bytes) total     , pg_size_pretty(index_bytes) index     , pg_size_pretty(toast_bytes) toast     , pg_size_pretty(table_bytes) table   (   select *, total_bytes-index_bytes-coalesce(toast_bytes,0) table_bytes (       select c.oid,nspname table_schema, relname table_name               , c.reltuples row_estimate               , pg_total_relation_size(c.oid) total_bytes               , pg_indexes_size(c.oid) index_bytes               , pg_total_relation_size(reltoastrelid) toast_bytes           pg_class c           left join pg_namespace n on n.oid = c.relnamespace           relkind = 'r'   ) ) order total_bytes desc;

is normal? or disk space not being reclaimed @ all?

vacuum reclaims storage occupied dead tuples, is, marks space inside table files , index available reuse, not free disk space.

i think want command rewrites entire table , indexes while keeping data there. cluster, or vacuum full, or 1 of forms of alter table requires table rewrite. if performance can benefit clustering on order, time it.

it locks table though, don't on live server requires uninterrupted access, unless table small , can live few seconds downtime.


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