62 lines
1.5 KiB
SQL
62 lines
1.5 KiB
SQL
--
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-- Test deallocation of entries
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--
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SHOW pg_stat_statements.max;
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SET pg_stat_statements.track = 'all';
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-- Create 101 tables.
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DO $$
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BEGIN
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FOR i IN 1..101 LOOP
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EXECUTE format('create table t%s (a int)', lpad(i::text, 3, '0'));
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END LOOP;
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END
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$$;
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SELECT pg_stat_statements_reset() IS NOT NULL AS t;
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-- Run 98 queries.
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DO $$
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BEGIN
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FOR i IN 1..98 LOOP
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EXECUTE format('select * from t%s', lpad(i::text, 3, '0'));
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END LOOP;
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END
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$$;
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-- All 98 queries should be registered. We just check the first and
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-- last to keep the output small.
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SELECT query FROM pg_stat_statements WHERE query LIKE '%t001%' OR query LIKE '%t098%' ORDER BY query;
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-- Query tables 2 through 98 again, so they have a higher calls count.
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-- Table 1 still has previous calls count.
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DO $$
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BEGIN
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FOR i IN 2..98 LOOP
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EXECUTE format('select * from t%s', lpad(i::text, 3, '0'));
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END LOOP;
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END
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$$;
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-- Run 3 more queries. This will exceed the max and will cause the
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-- least used query to be deallocated. (The queries for
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-- pg_stat_statements themselves will also register, so fewer than 3
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-- queries will also cause overflow, but let's keep this scenario
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-- self-contained.)
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DO $$
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BEGIN
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FOR i IN 99..101 LOOP
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EXECUTE format('select * from t%s', lpad(i::text, 3, '0'));
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END LOOP;
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END
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$$;
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-- Check that the limit was kept.
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SELECT count(*) <= 100 FROM pg_stat_statements;
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-- Check that record for t001 has been deallocated.
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SELECT query FROM pg_stat_statements WHERE query LIKE '%t001%' ORDER BY query;
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-- Check deallocation count.
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SELECT dealloc > 0 AS t FROM pg_stat_statements_info;
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