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https://git.postgresql.org/git/postgresql.git
synced 2024-08-28 17:07:19 +02:00
52 lines
1.8 KiB
MySQL
52 lines
1.8 KiB
MySQL
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-- predictability
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SET synchronous_commit = on;
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DROP TABLE IF EXISTS xpto;
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SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'test_decoding');
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CREATE SEQUENCE xpto_rand_seq START 79 INCREMENT 1499; -- portable "random"
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CREATE TABLE xpto (
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id serial primary key,
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toasted_col1 text,
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rand1 float8 DEFAULT nextval('xpto_rand_seq'),
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toasted_col2 text,
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rand2 float8 DEFAULT nextval('xpto_rand_seq')
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);
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-- uncompressed external toast data
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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);
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-- compressed external toast data
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INSERT INTO xpto (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 xpto SET toasted_col1 = (SELECT string_agg(g.i::text, '') FROM generate_series(1, 2000) g(i)) WHERE id = 1;
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UPDATE xpto SET rand1 = 123.456 WHERE id = 1;
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DELETE FROM xpto WHERE id = 1;
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DROP TABLE IF EXISTS toasted_key;
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CREATE TABLE toasted_key (
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id serial,
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toasted_key text PRIMARY KEY,
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toasted_col1 text,
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toasted_col2 text
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);
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ALTER TABLE toasted_key ALTER COLUMN toasted_key SET STORAGE EXTERNAL;
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ALTER TABLE toasted_key ALTER COLUMN toasted_col1 SET STORAGE EXTERNAL;
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INSERT INTO toasted_key(toasted_key, toasted_col1) VALUES(repeat('1234567890', 200), repeat('9876543210', 200));
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-- test update of a toasted key without changing it
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UPDATE toasted_key SET toasted_col2 = toasted_col1;
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-- test update of a toasted key, changing it
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UPDATE toasted_key SET toasted_key = toasted_key || '1';
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DELETE FROM toasted_key;
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SELECT substr(data, 1, 200) 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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