Measure the size of a PostgreSQL table rowĪll the usual advice for performance optimization applies.

Are regular VACUUM ANALYZE still recommended under 9.1?.Did you enable it? (It's the default in modern Postgres.) It can also count calls to user-defined functions and the total time spent in each one. It also tracks the total number of rows in each table, and information about vacuum and analyze actions for each table. Alternatively, you can right-click a cell in the table and then click Navigate -> Row Count. To get the number of rows in a single table we can use the COUNT() or COUNTBIG() functions, e.g. (Or are you updating a lot?) A huge amount of dead tuples could slow you down - and call for VACUUM. Presently, the collector can count accesses to tables and indexes in both disk-block and individual-row terms. The number of rows appears in a status field next to the button. 1 Answer Sorted by: 42 Those two columns are the result of SELECT pgstatgetlivetuples (c.oid) AS nlivetup, pgstatgetdeadtuples (c.oid) AS ndeadtup FROM pgclass c Representing the number of live and dead rows (tuples) in the table. That your app will never delete images from this table makes this even more suspicious, because there shouldn't be many dead rows then.

Counting a million should not take more than a few seconds in the worst case.

Fast way to discover the row count of a tableĪs a matter of fact, in a DB with concurrent write access every count is an estimate, because the number may be outdated the instant you get it.īut, like commented, there is something off in your DB.

This function takes the name of the column as its argument (e.g., id ) and returns. Generally, if you don't need an exact count, there is a much faster way: SELECT reltuples::bigint AS estimate Use the COUNT aggregate function to count the number of rows in a table. CREATE OR REPLACE FUNCTION public.getcount ( TEXT, TEXT ) RETURNS TABLE (tcolumnname TEXT, tcount BIGINT ) LANGUAGE plpgsql AS BODY DECLARE pschema TEXT : 1 ptabname TEXT : 2 vsqlstatement TEXT BEGIN SELECT STRINGAGG ( 'SELECT ''' columnname ''',' ' count (' columnname ') FROM ' tableschema '.' tabl.

Postgresql count rows in table