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# ALTER TABLE - Add and Validate constraint with concurrent writes
#
# VALIDATE allows a minimum of ShareUpdateExclusiveLock
# so we mix reads with it to see what works or waits
setup
{
CREATE TABLE a (i int PRIMARY KEY);
CREATE TABLE b (a_id int);
INSERT INTO a VALUES (0), (1), (2), (3);
INSERT INTO b SELECT generate_series(1,1000) % 4;
}
teardown
{
DROP TABLE a, b;
}
session "s1"
step "s1" { BEGIN; }
step "at1" { ALTER TABLE b ADD CONSTRAINT bfk FOREIGN KEY (a_id) REFERENCES a (i) NOT VALID; }
step "sc1" { COMMIT; }
step "s2" { BEGIN; }
step "at2" { ALTER TABLE b VALIDATE CONSTRAINT bfk; }
step "sc2" { COMMIT; }
session "s2"
setup { BEGIN; }
step "rx1" { SELECT * FROM b WHERE a_id = 1 LIMIT 1; }
step "wx" { INSERT INTO b VALUES (0); }
step "rx1" { SELECT * FROM b WHERE a_id = 3 LIMIT 3; }
step "c2" { COMMIT; }
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