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b89e151054
This feature, building on previous commits, allows the write-ahead log stream to be decoded into a series of logical changes; that is, inserts, updates, and deletes and the transactions which contain them. It is capable of handling decoding even across changes to the schema of the effected tables. The output format is controlled by a so-called "output plugin"; an example is included. To make use of this in a real replication system, the output plugin will need to be modified to produce output in the format appropriate to that system, and to perform filtering. Currently, information can be extracted from the logical decoding system only via SQL; future commits will add the ability to stream changes via walsender. Andres Freund, with review and other contributions from many other people, including Álvaro Herrera, Abhijit Menon-Sen, Peter Gheogegan, Kevin Grittner, Robert Haas, Heikki Linnakangas, Fujii Masao, Abhijit Menon-Sen, Michael Paquier, Simon Riggs, Craig Ringer, and Steve Singer.
338 lines
13 KiB
PL/PgSQL
338 lines
13 KiB
PL/PgSQL
-- predictability
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SET synchronous_commit = on;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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-- fail because of an already existing slot
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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-- fail because of an invalid name
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SELECT 'init' FROM pg_create_logical_replication_slot('Invalid Name', 'test_decoding');
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-- fail twice because of an invalid parameter values
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SELECT 'init' FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', 'frakbar');
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SELECT 'init' FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'nonexistant-option', 'frakbar');
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SELECT 'init' FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', 'frakbar');
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-- succeed once
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SELECT pg_drop_replication_slot('regression_slot');
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-- fail
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SELECT pg_drop_replication_slot('regression_slot');
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-- check that we're detecting a streaming rep slot used for logical decoding
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SELECT 'init' FROM pg_create_physical_replication_slot('repl');
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SELECT data FROM pg_logical_slot_get_changes('repl', NULL, NULL, 'include-xids', '0');
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SELECT pg_drop_replication_slot('repl');
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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/* check whether status function reports us, only reproduceable columns */
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SELECT slot_name, plugin, slot_type, active,
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NOT catalog_xmin IS NULL AS catalog_xmin_set,
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xmin IS NULl AS data_xmin_not_set,
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pg_xlog_location_diff(restart_lsn, '0/01000000') > 0 AS some_wal
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FROM pg_replication_slots;
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/*
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* Check that changes are handled correctly when interleaved with ddl
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*/
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CREATE TABLE replication_example(id SERIAL PRIMARY KEY, somedata int, text varchar(120));
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BEGIN;
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INSERT INTO replication_example(somedata, text) VALUES (1, 1);
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INSERT INTO replication_example(somedata, text) VALUES (1, 2);
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COMMIT;
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ALTER TABLE replication_example ADD COLUMN bar int;
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INSERT INTO replication_example(somedata, text, bar) VALUES (2, 1, 4);
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BEGIN;
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INSERT INTO replication_example(somedata, text, bar) VALUES (2, 2, 4);
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INSERT INTO replication_example(somedata, text, bar) VALUES (2, 3, 4);
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INSERT INTO replication_example(somedata, text, bar) VALUES (2, 4, NULL);
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COMMIT;
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ALTER TABLE replication_example DROP COLUMN bar;
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INSERT INTO replication_example(somedata, text) VALUES (3, 1);
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BEGIN;
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INSERT INTO replication_example(somedata, text) VALUES (3, 2);
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INSERT INTO replication_example(somedata, text) VALUES (3, 3);
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COMMIT;
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ALTER TABLE replication_example RENAME COLUMN text TO somenum;
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INSERT INTO replication_example(somedata, somenum) VALUES (4, 1);
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-- collect all changes
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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ALTER TABLE replication_example ALTER COLUMN somenum TYPE int4 USING (somenum::int4);
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-- throw away changes, they contain oids
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SELECT count(data) FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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INSERT INTO replication_example(somedata, somenum) VALUES (5, 1);
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BEGIN;
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INSERT INTO replication_example(somedata, somenum) VALUES (6, 1);
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ALTER TABLE replication_example ADD COLUMN zaphod1 int;
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INSERT INTO replication_example(somedata, somenum, zaphod1) VALUES (6, 2, 1);
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ALTER TABLE replication_example ADD COLUMN zaphod2 int;
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INSERT INTO replication_example(somedata, somenum, zaphod2) VALUES (6, 3, 1);
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INSERT INTO replication_example(somedata, somenum, zaphod1) VALUES (6, 4, 2);
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COMMIT;
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-- show changes
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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-- hide changes bc of oid visible in full table rewrites
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CREATE TABLE tr_unique(id2 serial unique NOT NULL, data int);
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INSERT INTO tr_unique(data) VALUES(10);
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ALTER TABLE tr_unique RENAME TO tr_pkey;
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ALTER TABLE tr_pkey ADD COLUMN id serial primary key;
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SELECT count(data) FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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INSERT INTO tr_pkey(data) VALUES(1);
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--show deletion with primary key
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DELETE FROM tr_pkey;
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/* display results */
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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/*
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* check that disk spooling works
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*/
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BEGIN;
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CREATE TABLE tr_etoomuch (id serial primary key, data int);
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INSERT INTO tr_etoomuch(data) SELECT g.i FROM generate_series(1, 10234) g(i);
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DELETE FROM tr_etoomuch WHERE id < 5000;
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UPDATE tr_etoomuch SET data = - data WHERE id > 5000;
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COMMIT;
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/* display results, but hide most of the output */
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SELECT count(*), min(data), max(data)
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FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0')
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GROUP BY substring(data, 1, 24)
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ORDER BY 1;
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/*
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* check whether we decode subtransactions correctly in relation with each
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* other
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*/
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CREATE TABLE tr_sub (id serial primary key, path text);
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-- toplevel, subtxn, toplevel, subtxn, subtxn
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BEGIN;
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INSERT INTO tr_sub(path) VALUES ('1-top-#1');
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SAVEPOINT a;
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INSERT INTO tr_sub(path) VALUES ('1-top-1-#1');
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INSERT INTO tr_sub(path) VALUES ('1-top-1-#2');
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RELEASE SAVEPOINT a;
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SAVEPOINT b;
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SAVEPOINT c;
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INSERT INTO tr_sub(path) VALUES ('1-top-2-1-#1');
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INSERT INTO tr_sub(path) VALUES ('1-top-2-1-#2');
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RELEASE SAVEPOINT c;
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INSERT INTO tr_sub(path) VALUES ('1-top-2-#1');
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RELEASE SAVEPOINT b;
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COMMIT;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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-- check that we handle xlog assignments correctly
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BEGIN;
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-- nest 80 subtxns
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SAVEPOINT subtop;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;SAVEPOINT a;
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-- assign xid by inserting
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INSERT INTO tr_sub(path) VALUES ('2-top-1...--#1');
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INSERT INTO tr_sub(path) VALUES ('2-top-1...--#2');
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INSERT INTO tr_sub(path) VALUES ('2-top-1...--#3');
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RELEASE SAVEPOINT subtop;
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INSERT INTO tr_sub(path) VALUES ('2-top-#1');
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COMMIT;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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-- make sure rollbacked subtransactions aren't decoded
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BEGIN;
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INSERT INTO tr_sub(path) VALUES ('3-top-2-#1');
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SAVEPOINT a;
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INSERT INTO tr_sub(path) VALUES ('3-top-2-1-#1');
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SAVEPOINT b;
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INSERT INTO tr_sub(path) VALUES ('3-top-2-2-#1');
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ROLLBACK TO SAVEPOINT b;
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INSERT INTO tr_sub(path) VALUES ('3-top-2-#2');
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COMMIT;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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-- test whether a known, but not yet logged toplevel xact, followed by a
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-- subxact commit is handled correctly
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BEGIN;
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SELECT txid_current() != 0; -- so no fixed xid apears in the outfile
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SAVEPOINT a;
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INSERT INTO tr_sub(path) VALUES ('4-top-1-#1');
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RELEASE SAVEPOINT a;
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COMMIT;
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-- test whether a change in a subtransaction, in an unknown toplevel
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-- xact is handled correctly.
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BEGIN;
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SAVEPOINT a;
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INSERT INTO tr_sub(path) VALUES ('5-top-1-#1');
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COMMIT;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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/*
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* Check whether treating a table as a catalog table works somewhat
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*/
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CREATE TABLE replication_metadata (
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id serial primary key,
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relation name NOT NULL,
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options text[]
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)
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WITH (user_catalog_table = true)
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;
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\d+ replication_metadata
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INSERT INTO replication_metadata(relation, options)
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VALUES ('foo', ARRAY['a', 'b']);
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ALTER TABLE replication_metadata RESET (user_catalog_table);
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\d+ replication_metadata
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INSERT INTO replication_metadata(relation, options)
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VALUES ('bar', ARRAY['a', 'b']);
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ALTER TABLE replication_metadata SET (user_catalog_table = true);
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\d+ replication_metadata
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INSERT INTO replication_metadata(relation, options)
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VALUES ('blub', NULL);
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-- make sure rewrites don't work
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ALTER TABLE replication_metadata ADD COLUMN rewritemeornot int;
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ALTER TABLE replication_metadata ALTER COLUMN rewritemeornot TYPE text;
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ALTER TABLE replication_metadata SET (user_catalog_table = false);
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\d+ replication_metadata
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INSERT INTO replication_metadata(relation, options)
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VALUES ('zaphod', NULL);
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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/*
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* check whether we handle updates/deletes correct with & without a pkey
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*/
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/* we should handle the case without a key at all more gracefully */
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CREATE TABLE table_without_key(id serial, data int);
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INSERT INTO table_without_key(data) VALUES(1),(2);
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DELETE FROM table_without_key WHERE data = 1;
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-- won't log old keys
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UPDATE table_without_key SET data = 3 WHERE data = 2;
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UPDATE table_without_key SET id = -id;
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UPDATE table_without_key SET id = -id;
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-- should log the full old row now
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ALTER TABLE table_without_key REPLICA IDENTITY FULL;
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UPDATE table_without_key SET data = 3 WHERE data = 2;
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UPDATE table_without_key SET id = -id;
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UPDATE table_without_key SET id = -id;
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DELETE FROM table_without_key WHERE data = 3;
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CREATE TABLE table_with_pkey(id serial primary key, data int);
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INSERT INTO table_with_pkey(data) VALUES(1), (2);
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DELETE FROM table_with_pkey WHERE data = 1;
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-- should log the old pkey
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UPDATE table_with_pkey SET data = 3 WHERE data = 2;
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UPDATE table_with_pkey SET id = -id;
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UPDATE table_with_pkey SET id = -id;
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-- check that we log nothing despite having a pkey
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ALTER TABLE table_without_key REPLICA IDENTITY NOTHING;
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UPDATE table_with_pkey SET id = -id;
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-- check that we log everything despite having a pkey
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ALTER TABLE table_without_key REPLICA IDENTITY FULL;
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UPDATE table_with_pkey SET id = -id;
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DELETE FROM table_with_pkey WHERE data = 3;
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CREATE TABLE table_with_unique_not_null(id serial unique, data int);
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ALTER TABLE table_with_unique_not_null ALTER COLUMN id SET NOT NULL; --already set
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-- won't log anything, replica identity not setup
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INSERT INTO table_with_unique_not_null(data) VALUES(1), (2);
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DELETE FROM table_with_unique_not_null WHERE data = 1;
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UPDATE table_with_unique_not_null SET data = 3 WHERE data = 2;
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UPDATE table_with_unique_not_null SET id = -id;
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UPDATE table_with_unique_not_null SET id = -id;
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DELETE FROM table_with_unique_not_null WHERE data = 3;
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-- should log old key
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ALTER TABLE table_with_unique_not_null REPLICA IDENTITY USING INDEX table_with_unique_not_null_id_key;
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INSERT INTO table_with_unique_not_null(data) VALUES(1), (2);
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DELETE FROM table_with_unique_not_null WHERE data = 1;
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UPDATE table_with_unique_not_null SET data = 3 WHERE data = 2;
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UPDATE table_with_unique_not_null SET id = -id;
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UPDATE table_with_unique_not_null SET id = -id;
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DELETE FROM table_with_unique_not_null WHERE data = 3;
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-- check toast support
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BEGIN;
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CREATE SEQUENCE toasttable_rand_seq START 79 INCREMENT 1499; -- portable "random"
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CREATE TABLE toasttable(
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id serial primary key,
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toasted_col1 text,
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rand1 float8 DEFAULT nextval('toasttable_rand_seq'),
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toasted_col2 text,
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rand2 float8 DEFAULT nextval('toasttable_rand_seq')
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);
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COMMIT;
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-- uncompressed external toast data
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INSERT INTO toasttable(toasted_col1) SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i);
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-- compressed external toast data
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INSERT INTO toasttable(toasted_col2) SELECT repeat(string_agg(to_char(g.i, 'FM0000'), ''), 50) FROM generate_series(1, 500) g(i);
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-- update of existing column
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UPDATE toasttable
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SET toasted_col1 = (SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i))
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WHERE id = 1;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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INSERT INTO toasttable(toasted_col1) SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i);
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-- update of second column, first column unchanged
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UPDATE toasttable
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SET toasted_col2 = (SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i))
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WHERE id = 1;
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-- make sure we decode correctly even if the toast table is gone
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DROP TABLE toasttable;
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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-- done, free logical replication slot
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SELECT data FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0');
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SELECT pg_drop_replication_slot('regression_slot');
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/* check that we aren't visible anymore now */
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SELECT * FROM pg_stat_replication;
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