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Diffstat (limited to '')
| -rw-r--r-- | contrib/test_decoding/sql/twophase.sql | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/contrib/test_decoding/sql/twophase.sql b/contrib/test_decoding/sql/twophase.sql new file mode 100644 index 0000000..aff5114 --- /dev/null +++ b/contrib/test_decoding/sql/twophase.sql @@ -0,0 +1,114 @@ +-- Test prepared transactions. When two-phase-commit is enabled, transactions are +-- decoded at PREPARE time rather than at COMMIT PREPARED time. +SET synchronous_commit = on; +SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding', false, true); + +CREATE TABLE test_prepared1(id integer primary key); +CREATE TABLE test_prepared2(id integer primary key); + +-- Test that decoding happens at PREPARE time when two-phase-commit is enabled. +-- Decoding after COMMIT PREPARED must have all the commands in the transaction. +BEGIN; +INSERT INTO test_prepared1 VALUES (1); +INSERT INTO test_prepared1 VALUES (2); +-- should show nothing because the xact has not been prepared yet. +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +PREPARE TRANSACTION 'test_prepared#1'; +-- should show both the above inserts and the PREPARE TRANSACTION. +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +COMMIT PREPARED 'test_prepared#1'; +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test that rollback of a prepared xact is decoded. +BEGIN; +INSERT INTO test_prepared1 VALUES (3); +PREPARE TRANSACTION 'test_prepared#2'; +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +ROLLBACK PREPARED 'test_prepared#2'; +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test prepare of a xact containing ddl. Leaving xact uncommitted for next test. +BEGIN; +ALTER TABLE test_prepared1 ADD COLUMN data text; +INSERT INTO test_prepared1 VALUES (4, 'frakbar'); +PREPARE TRANSACTION 'test_prepared#3'; +-- confirm that exclusive lock from the ALTER command is held on test_prepared1 table +SELECT 'test_prepared_1' AS relation, locktype, mode +FROM pg_locks +WHERE locktype = 'relation' + AND relation = 'test_prepared1'::regclass; +-- The insert should show the newly altered column but not the DDL. +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test that we decode correctly while an uncommitted prepared xact +-- with ddl exists. +-- +-- Use a separate table for the concurrent transaction because the lock from +-- the ALTER will stop us inserting into the other one. +-- +INSERT INTO test_prepared2 VALUES (5); +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +COMMIT PREPARED 'test_prepared#3'; +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +-- make sure stuff still works +INSERT INTO test_prepared1 VALUES (6); +INSERT INTO test_prepared2 VALUES (7); +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Check 'CLUSTER' (as operation that hold exclusive lock) doesn't block +-- logical decoding. +BEGIN; +INSERT INTO test_prepared1 VALUES (8, 'othercol'); +CLUSTER test_prepared1 USING test_prepared1_pkey; +INSERT INTO test_prepared1 VALUES (9, 'othercol2'); +PREPARE TRANSACTION 'test_prepared_lock'; + +SELECT 'test_prepared1' AS relation, locktype, mode +FROM pg_locks +WHERE locktype = 'relation' + AND relation = 'test_prepared1'::regclass; +-- The above CLUSTER command shouldn't cause a timeout on 2pc decoding. +\set env_timeout '' +\getenv env_timeout PG_TEST_TIMEOUT_DEFAULT +SELECT COALESCE(NULLIF(:'env_timeout', ''), '180') || 's' AS timeout \gset +SET statement_timeout = :'timeout'; +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +RESET statement_timeout; +COMMIT PREPARED 'test_prepared_lock'; +-- consume the commit +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test savepoints and sub-xacts. Creating savepoints will create +-- sub-xacts implicitly. +BEGIN; +CREATE TABLE test_prepared_savepoint (a int); +INSERT INTO test_prepared_savepoint VALUES (1); +SAVEPOINT test_savepoint; +INSERT INTO test_prepared_savepoint VALUES (2); +ROLLBACK TO SAVEPOINT test_savepoint; +PREPARE TRANSACTION 'test_prepared_savepoint'; +-- should show only 1, not 2 +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +COMMIT PREPARED 'test_prepared_savepoint'; +-- consume the commit +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test that a GID containing "_nodecode" gets decoded at commit prepared time. +BEGIN; +INSERT INTO test_prepared1 VALUES (20); +PREPARE TRANSACTION 'test_prepared_nodecode'; +-- should show nothing +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); +COMMIT PREPARED 'test_prepared_nodecode'; +-- should be decoded now +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +-- Test 8: +-- cleanup and make sure results are also empty +DROP TABLE test_prepared1; +DROP TABLE test_prepared2; +-- show results. There should be nothing to show +SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1'); + +SELECT pg_drop_replication_slot('regression_slot'); |