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Masahiko Sawada 072ee847ad Skip logical decoding of already-aborted transactions. ... Previously, transaction aborts were detected concurrently only during system catalog scans while replaying a transaction in streaming mode. This commit adds an additional CLOG lookup to check the transaction status, allowing the logical decoding to skip changes also when it doesn't touch system catalogs, if the transaction is already aborted. This optimization enhances logical decoding performance, especially for large transactions that have already been rolled back, as it avoids unnecessary disk or network I/O. To avoid potential slowdowns caused by frequent CLOG lookups for small transactions (most of which commit), the CLOG lookup is performed only for large transactions before eviction. The performance benchmark results showed there is not noticeable performance regression due to CLOG lookups. Reviewed-by: Amit Kapila, Peter Smith, Vignesh C, Ajin Cherian Reviewed-by: Dilip Kumar, Andres Freund Discussion: https://postgr.es/m/CAD21AoDht9Pz_DFv_R2LqBTBbO4eGrpa9Vojmt5z5sEx3XwD7A@mail.gmail.com		5 months ago
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binary.sql	test_decoding: Protect against rare spurious test failures.	10 years ago
ddl.sql	Make test_decoding ddl.out shorter	2 years ago
decoding_in_xact.sql	Make RelationFlushRelation() work without ResourceOwner during abort	1 year ago
decoding_into_rel.sql	Revert "Logical decoding of sequences"	3 years ago
messages.sql	Add flush option to pg_logical_emit_message()	2 years ago
permissions.sql	Add a slot synchronization function.	1 year ago
prepared.sql	Add skip-empty-xacts option to test_decoding for use in the regression tests.	11 years ago
replorigin.sql	Fix the misuse of origin filter across multiple pg_logical_slot_get_changes() calls.	2 years ago
rewrite.sql	Revert "Logical decoding of sequences"	3 years ago
slot.sql	Add a slot synchronization function.	1 year ago
spill.sql	Make contrib/test_decoding regression tests safe for CZ locale.	9 years ago
stats.sql	Skip logical decoding of already-aborted transactions.	5 months ago
stream.sql	Skip logical decoding of already-aborted transactions.	5 months ago
time.sql	logical decoding: fix decoding of a commit's commit time.	9 years ago
toast.sql	Revert "Logical decoding of sequences"	3 years ago
truncate.sql	Revert "Logical decoding of sequences"	3 years ago
twophase.sql	Stabilize the test added by commit 022564f60c.	9 months ago
twophase_stream.sql	Add option to enable two_phase commits via pg_create_logical_replication_slot.	4 years ago
xact.sql	Don't propagate a null subtransaction snapshot up to parent transaction.	9 years ago