diff options
Diffstat (limited to 'src/test/regress/sql')
| -rw-r--r-- | src/test/regress/sql/stats.sql | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/test/regress/sql/stats.sql b/src/test/regress/sql/stats.sql index eb081f65a42..f6270f7badb 100644 --- a/src/test/regress/sql/stats.sql +++ b/src/test/regress/sql/stats.sql @@ -291,6 +291,92 @@ DROP TABLE prevstats; ----- +-- Test that last_seq_scan, last_idx_scan are correctly maintained +-- +-- Perform test using a temporary table. That way autovacuum etc won't +-- interfere. To be able to check that timestamps increase, we sleep for 100ms +-- between tests, assuming that there aren't systems with a coarser timestamp +-- granularity. +----- + +BEGIN; +CREATE TEMPORARY TABLE test_last_scan(idx_col int primary key, noidx_col int); +INSERT INTO test_last_scan(idx_col, noidx_col) VALUES(1, 1); +SELECT pg_stat_force_next_flush(); +COMMIT; + +SELECT pg_stat_reset_single_table_counters('test_last_scan'::regclass); +SELECT seq_scan, idx_scan FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass; + +-- ensure we start out with exactly one index and sequential scan +BEGIN; +SET LOCAL enable_seqscan TO on; +SET LOCAL enable_indexscan TO on; +SET LOCAL enable_bitmapscan TO off; +EXPLAIN (COSTS off) SELECT count(*) FROM test_last_scan WHERE noidx_col = 1; +SELECT count(*) FROM test_last_scan WHERE noidx_col = 1; +SET LOCAL enable_seqscan TO off; +EXPLAIN (COSTS off) SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT pg_stat_force_next_flush(); +COMMIT; + +-- fetch timestamps from before the next test +SELECT last_seq_scan AS test_last_seq, last_idx_scan AS test_last_idx +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass \gset +SELECT pg_sleep(0.1); -- assume a minimum timestamp granularity of 100ms + +-- cause one sequential scan +BEGIN; +SET LOCAL enable_seqscan TO on; +SET LOCAL enable_indexscan TO off; +SET LOCAL enable_bitmapscan TO off; +EXPLAIN (COSTS off) SELECT count(*) FROM test_last_scan WHERE noidx_col = 1; +SELECT count(*) FROM test_last_scan WHERE noidx_col = 1; +SELECT pg_stat_force_next_flush(); +COMMIT; +-- check that just sequential scan stats were incremented +SELECT seq_scan, :'test_last_seq' < last_seq_scan AS seq_ok, idx_scan, :'test_last_idx' = last_idx_scan AS idx_ok +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass; + +-- fetch timestamps from before the next test +SELECT last_seq_scan AS test_last_seq, last_idx_scan AS test_last_idx +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass \gset +SELECT pg_sleep(0.1); + +-- cause one index scan +BEGIN; +SET LOCAL enable_seqscan TO off; +SET LOCAL enable_indexscan TO on; +SET LOCAL enable_bitmapscan TO off; +EXPLAIN (COSTS off) SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT pg_stat_force_next_flush(); +COMMIT; +-- check that just index scan stats were incremented +SELECT seq_scan, :'test_last_seq' = last_seq_scan AS seq_ok, idx_scan, :'test_last_idx' < last_idx_scan AS idx_ok +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass; + +-- fetch timestamps from before the next test +SELECT last_seq_scan AS test_last_seq, last_idx_scan AS test_last_idx +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass \gset +SELECT pg_sleep(0.1); + +-- cause one bitmap index scan +BEGIN; +SET LOCAL enable_seqscan TO off; +SET LOCAL enable_indexscan TO off; +SET LOCAL enable_bitmapscan TO on; +EXPLAIN (COSTS off) SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT count(*) FROM test_last_scan WHERE idx_col = 1; +SELECT pg_stat_force_next_flush(); +COMMIT; +-- check that just index scan stats were incremented +SELECT seq_scan, :'test_last_seq' = last_seq_scan AS seq_ok, idx_scan, :'test_last_idx' < last_idx_scan AS idx_ok +FROM pg_stat_all_tables WHERE relid = 'test_last_scan'::regclass; + + +----- -- Test that various stats views are being properly populated ----- |