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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.
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
Parsed test spec with 2 sessions
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starting permutation: s1b s1w s2init s1c s2start s1b s1w s1c s2start s1b s1w s2start s1c s2start
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step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
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step s1w: INSERT INTO do_write DEFAULT VALUES;
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step s2init: SELECT 'init' FROM pg_create_logical_replication_slot('isolation_slot', 'test_decoding'); <waiting ...>
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step s1c: COMMIT;
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step s2init: <... completed>
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?column?
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init
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step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
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data
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step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
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step s1w: INSERT INTO do_write DEFAULT VALUES;
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step s1c: COMMIT;
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step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
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data
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BEGIN
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table public.do_write: INSERT: id[integer]:2
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COMMIT
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step s1b: BEGIN ISOLATION LEVEL SERIALIZABLE;
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step s1w: INSERT INTO do_write DEFAULT VALUES;
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step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
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data
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step s1c: COMMIT;
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step s2start: SELECT data FROM pg_logical_slot_get_changes('isolation_slot', NULL, NULL, 'include-xids', 'false');
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data
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BEGIN
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table public.do_write: INSERT: id[integer]:3
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COMMIT
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?column?
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stop
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