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df4f3ab517
Allow users to opt out of returning FPI data and block data from
pg_get_wal_block_info as an optimization. Testing has shown that this
can make function execution over twice as fast in some cases.
When pg_get_wal_block_info is called with "show_data := false", it
always returns NULL values for its block_data and block_fpi_data bytea
output parameters. Nothing else changes. In particular, the function
will still return the usual per-block summary of block data/FPI space
overhead. Use of "show_data := false" is therefore feasible with all
queries that don't specifically require these raw binary strings.
Follow-up to recent work in commit 122376f0. There still hasn't been a
stable release with the pg_get_wal_block_info function, so no bump in
the pg_walinspect extension version.
Per suggestion from Melanie Plageman.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAAKRu_bJvbcYBRj2cN6G2xV7B7-Ja+pjTO1nEnEhRR8OXYiABA@mail.gmail.com
Discussion: https://postgr.es/m/CAH2-Wzm9shOkEDM10_+qOZkRSQhKVxwBFiehH6EHWQQRd_rDPw@mail.gmail.com
70 lines
2.4 KiB
Plaintext
70 lines
2.4 KiB
Plaintext
-- Test old extension version entry points.
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CREATE EXTENSION pg_walinspect WITH VERSION '1.0';
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-- Mask DETAIL messages as these could refer to current LSN positions.
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\set VERBOSITY terse
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-- List what version 1.0 contains, using a locale-independent sorting.
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SELECT pg_describe_object(classid, objid, 0) AS obj
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FROM pg_depend
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WHERE refclassid = 'pg_extension'::regclass AND
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refobjid = (SELECT oid FROM pg_extension
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WHERE extname = 'pg_walinspect') AND deptype = 'e'
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ORDER BY pg_describe_object(classid, objid, 0) COLLATE "C";
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obj
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-----------------------------------------------------------
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function pg_get_wal_record_info(pg_lsn)
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function pg_get_wal_records_info(pg_lsn,pg_lsn)
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function pg_get_wal_records_info_till_end_of_wal(pg_lsn)
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function pg_get_wal_stats(pg_lsn,pg_lsn,boolean)
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function pg_get_wal_stats_till_end_of_wal(pg_lsn,boolean)
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(5 rows)
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-- Make sure checkpoints don't interfere with the test.
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SELECT 'init' FROM pg_create_physical_replication_slot('regress_pg_walinspect_slot', true, false);
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?column?
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----------
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init
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(1 row)
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CREATE TABLE sample_tbl(col1 int, col2 int);
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SELECT pg_current_wal_lsn() AS wal_lsn1 \gset
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INSERT INTO sample_tbl SELECT * FROM generate_series(1, 2);
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-- Tests for the past functions.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info_till_end_of_wal(:'wal_lsn1');
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ok
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----
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t
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(1 row)
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_stats_till_end_of_wal(:'wal_lsn1');
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ok
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----
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t
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(1 row)
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-- Failures with start LSNs.
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SELECT * FROM pg_get_wal_records_info_till_end_of_wal('FFFFFFFF/FFFFFFFF');
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ERROR: WAL start LSN must be less than current LSN
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SELECT * FROM pg_get_wal_stats_till_end_of_wal('FFFFFFFF/FFFFFFFF');
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ERROR: WAL start LSN must be less than current LSN
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-- Move to new version 1.1.
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ALTER EXTENSION pg_walinspect UPDATE TO '1.1';
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-- List what version 1.1 contains.
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\dx+ pg_walinspect
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Objects in extension "pg_walinspect"
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Object description
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-------------------------------------------------------
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function pg_get_wal_block_info(pg_lsn,pg_lsn,boolean)
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function pg_get_wal_record_info(pg_lsn)
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function pg_get_wal_records_info(pg_lsn,pg_lsn)
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function pg_get_wal_stats(pg_lsn,pg_lsn,boolean)
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(4 rows)
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SELECT pg_drop_replication_slot('regress_pg_walinspect_slot');
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pg_drop_replication_slot
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--------------------------
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(1 row)
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DROP TABLE sample_tbl;
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DROP EXTENSION pg_walinspect;
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