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6c61b0d93c
function that actually sleeps, instead of busy-waiting. Perhaps this will resolve some of the intermittent stats failures we keep seeing.
46 lines
1.5 KiB
SQL
46 lines
1.5 KiB
SQL
--
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-- Test Statistics Collector
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--
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-- Must be run after tenk2 has been created (by create_table),
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-- populated (by create_misc) and indexed (by create_index).
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--
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-- conditio sine qua non
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SHOW stats_start_collector; -- must be on
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-- XXX stopgap until we figure out how bitmap scans should be counted
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SET enable_bitmapscan = off;
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-- save counters
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CREATE TEMP TABLE prevstats AS
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SELECT t.seq_scan, t.seq_tup_read, t.idx_scan, t.idx_tup_fetch,
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(b.heap_blks_read + b.heap_blks_hit) AS heap_blks,
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(b.idx_blks_read + b.idx_blks_hit) AS idx_blks
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FROM pg_catalog.pg_stat_user_tables AS t,
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pg_catalog.pg_statio_user_tables AS b
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WHERE t.relname='tenk2' AND b.relname='tenk2';
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-- enable statistics
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SET stats_block_level = on;
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SET stats_row_level = on;
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-- do something
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SELECT count(*) FROM tenk2;
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SELECT count(*) FROM tenk2 WHERE unique1 = 1;
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-- let stats collector catch up
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SELECT do_sleep(2);
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-- check effects
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SELECT st.seq_scan >= pr.seq_scan + 1,
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st.seq_tup_read >= pr.seq_tup_read + cl.reltuples,
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st.idx_scan >= pr.idx_scan + 1,
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st.idx_tup_fetch >= pr.idx_tup_fetch + 1
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FROM pg_stat_user_tables AS st, pg_class AS cl, prevstats AS pr
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WHERE st.relname='tenk2' AND cl.relname='tenk2';
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SELECT st.heap_blks_read + st.heap_blks_hit >= pr.heap_blks + cl.relpages,
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st.idx_blks_read + st.idx_blks_hit >= pr.idx_blks + 1
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FROM pg_statio_user_tables AS st, pg_class AS cl, prevstats AS pr
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WHERE st.relname='tenk2' AND cl.relname='tenk2';
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-- End of Stats Test
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