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# Multiple Row Versions test
#
# This test is designed to cover some code paths which only occur with
# four or more transactions interacting with particular timings.
#
# Due to long permutation setup time, we are only testing one specific
# permutation, which should get a serialization error.
setup
{
CREATE TABLE t (id int NOT NULL, txt text) WITH (fillfactor=50);
INSERT INTO t (id)
SELECT x FROM (SELECT * FROM generate_series(1, 1000000)) a(x);
ALTER TABLE t ADD PRIMARY KEY (id);
}
teardown
{
DROP TABLE t;
}
session s1
setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step rx1 { SELECT * FROM t WHERE id = 1000000; }
# delay until after T3 commits
step wz1 { UPDATE t SET txt = 'a' WHERE id = 1; }
step c1 { COMMIT; }
session s2
setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step wx2 { UPDATE t SET txt = 'b' WHERE id = 1000000; }
step c2 { COMMIT; }
session s3
setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step wx3 { UPDATE t SET txt = 'c' WHERE id = 1000000; }
step ry3 { SELECT * FROM t WHERE id = 500000; }
# delay until after T4 commits
step c3 { COMMIT; }
session s4
setup { BEGIN ISOLATION LEVEL SERIALIZABLE; }
step wy4 { UPDATE t SET txt = 'd' WHERE id = 500000; }
step rz4 { SELECT * FROM t WHERE id = 1; }
step c4 { COMMIT; }
permutation rx1 wx2 c2 wx3 ry3 wy4 rz4 c4 c3 wz1 c1
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