监控PostgreSQL中索引构建的进展

SELECT
  t.tablename,indexname,c.reltuples AS num_rows,pg_size_pretty(pg_relation_size(quote_ident(t.tablename)::text)) AS table_size,pg_size_pretty(pg_relation_size(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 )
    AS foo
  ON t.tablename = foo.ctablename
WHERE t.schemaname='public'
ORDER BY 1,2;

列num_rows表示索引覆盖的行数,index_size将随着索引的构建而增长.