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