39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
# This test provokes a "snapshot too old" error using a cursor.
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#
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# The sleep is needed because with a threshold of zero a statement could error
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# on changes it made. With more normal settings no external delay is needed,
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# but we don't want these tests to run long enough to see that, since
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# granularity is in minutes.
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#
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# Since results depend on the value of old_snapshot_threshold, sneak that into
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# the line generated by the sleep, so that a surprising value isn't so hard
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# to identify.
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setup
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{
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CREATE TABLE sto1 (c int NOT NULL);
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INSERT INTO sto1 SELECT generate_series(1, 1000);
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}
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setup
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{
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VACUUM ANALYZE sto1;
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}
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teardown
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{
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DROP TABLE sto1;
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}
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session "s1"
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setup { BEGIN ISOLATION LEVEL REPEATABLE READ; }
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step "s1decl" { DECLARE cursor1 CURSOR FOR SELECT c FROM sto1; }
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step "s1f1" { FETCH FIRST FROM cursor1; }
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step "s1sleep" { SELECT setting, pg_sleep(6) FROM pg_settings WHERE name = 'old_snapshot_threshold'; }
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step "s1f2" { FETCH FIRST FROM cursor1; }
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teardown { COMMIT; }
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session "s2"
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step "s2u" { UPDATE sto1 SET c = 1001 WHERE c = 1; }
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permutation "s1decl" "s1f1" "s1sleep" "s2u" "s1f2"
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