-- predictability SET synchronous_commit = on; DROP TABLE IF EXISTS xpto; NOTICE: table "xpto" does not exist, skipping SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding'); ?column? ---------- init (1 row) CREATE SEQUENCE xpto_rand_seq START 79 INCREMENT 1499; -- portable "random" CREATE TABLE xpto ( id serial primary key, toasted_col1 text, rand1 float8 DEFAULT nextval('xpto_rand_seq'), toasted_col2 text, rand2 float8 DEFAULT nextval('xpto_rand_seq') ); -- uncompressed external toast data INSERT INTO xpto (toasted_col1, toasted_col2) SELECT string_agg(g.i::text, ''), string_agg((g.i*2)::text, '') FROM generate_series(1, 2000) g(i); -- compressed external toast data INSERT INTO xpto (toasted_col2) SELECT repeat(string_agg(to_char(g.i, 'FM0000'), ''), 50) FROM generate_series(1, 500) g(i); -- update of existing column UPDATE xpto SET toasted_col1 = (SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i)) WHERE id = 1; UPDATE xpto SET rand1 = 123.456 WHERE id = 1; DELETE FROM xpto WHERE id = 1; DROP TABLE IF EXISTS toasted_key; NOTICE: table "toasted_key" does not exist, skipping CREATE TABLE toasted_key ( id serial, toasted_key text PRIMARY KEY, toasted_col1 text, toasted_col2 text ); ALTER TABLE toasted_key ALTER COLUMN toasted_key SET STORAGE EXTERNAL; ALTER TABLE toasted_key ALTER COLUMN toasted_col1 SET STORAGE EXTERNAL; INSERT INTO toasted_key(toasted_key, toasted_col1) VALUES(repeat('1234567890', 200), repeat('9876543210', 200)); -- test update of a toasted key without changing it UPDATE toasted_key SET toasted_col2 = toasted_col1; -- test update of a toasted key, changing it UPDATE toasted_key SET toasted_key = toasted_key || '1'; DELETE FROM toasted_key; SELECT substr(data, 1, 200) FROM pg_logical_slot_get_changes('regression_slot', NULL, NULL, 'include-xids', '0'); substr ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- BEGIN COMMIT BEGIN COMMIT BEGIN table public.xpto: INSERT: id[integer]:1 toasted_col1[text]:'1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 COMMIT BEGIN table public.xpto: INSERT: id[integer]:2 toasted_col1[text]:null rand1[double precision]:3077 toasted_col2[text]:'00010002000300040005000600070008000900100011001200130014001500160017001800190020002100 COMMIT BEGIN table public.xpto: UPDATE: id[integer]:1 toasted_col1[text]:'1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 COMMIT BEGIN table public.xpto: UPDATE: id[integer]:1 toasted_col1[text]:unchanged-toast-datum rand1[double precision]:123.456 toasted_col2[text]:unchanged-toast-datum rand2[double precision]:1578 COMMIT BEGIN table public.xpto: DELETE: id[integer]:1 COMMIT BEGIN COMMIT BEGIN COMMIT BEGIN COMMIT BEGIN table public.toasted_key: INSERT: id[integer]:1 toasted_key[text]:'1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123 COMMIT BEGIN table public.toasted_key: UPDATE: id[integer]:1 toasted_key[text]:unchanged-toast-datum toasted_col1[text]:unchanged-toast-datum toasted_col2[text]:'987654321098765432109876543210987654321098765432109 COMMIT BEGIN table public.toasted_key: UPDATE: old-key: toasted_key[text]:'123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678 COMMIT BEGIN table public.toasted_key: DELETE: toasted_key[text]:'123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 COMMIT (37 rows) SELECT pg_drop_replication_slot('regression_slot'); pg_drop_replication_slot -------------------------- (1 row)