# DROP INDEX CONCURRENTLY # # This test shows that the concurrent write behaviour works correctly # with the expected output being 2 rows at the READ COMMITTED and READ # UNCOMMITTED transaction isolation levels, and 1 row at the other # transaction isolation levels. # setup { CREATE TABLE test_dc(id serial primary key, data int); INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100); CREATE INDEX test_dc_data ON test_dc(data); } teardown { DROP TABLE test_dc; } session "s1" step "noseq" { SET enable_seqscan = false; } step "chkiso" { SELECT (setting in ('read committed','read uncommitted')) AS is_read_committed FROM pg_settings WHERE name = 'default_transaction_isolation'; } step "prepi" { PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34 ORDER BY id,data; } step "preps" { PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text ORDER BY id,data; } step "begin" { BEGIN; } step "explaini" { EXPLAIN (COSTS OFF) EXECUTE getrow_idx; } step "explains" { EXPLAIN (COSTS OFF) EXECUTE getrow_seq; } step "selecti" { EXECUTE getrow_idx; } step "selects" { EXECUTE getrow_seq; } step "end" { COMMIT; } session "s2" setup { BEGIN; } step "select2" { SELECT * FROM test_dc WHERE data=34 ORDER BY id,data; } step "insert2" { INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100); } step "end2" { COMMIT; } session "s3" step "drop" { DROP INDEX CONCURRENTLY test_dc_data; } permutation "noseq" "chkiso" "prepi" "preps" "begin" "explaini" "explains" "select2" "drop" "insert2" "end2" "selecti" "selects" "end"