I was doing some testing with temporary tables using this sql: begin; select pg_sleep(30); create temporary TABLE foo (a int, b int, c int, d text); insert into foo SELECT (x%1000) AS a,(x%1001) AS b, (x % 650) as c, '' as d FROM generate_series( 1, 1000000 ) AS x; -- create temporary TABLE foo AS SELECT (x%1000) AS a,(x%1001) AS b, (x % 650) as c, '' as d FROM generate_series( 1, 1000000 ) AS x; select count(1) from foo; While it was in pg_sleep, I would attach to the backend process with strace. I observed a few things that I don't yet understand, but one thing I did notice was an I/O pattern (following the count(1)) that seemed to suggest that the table was getting its hint bits set. I thought hint bits were just for the mvcc side of things? If this is a temporary table, is there any need or benefit to setting hint bits? -- Jon -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
