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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
158 lines
6.9 KiB
SQL
158 lines
6.9 KiB
SQL
CREATE EXTENSION pg_walinspect;
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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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-- 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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CREATE TABLE sample_tbl(col1 int, col2 int);
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-- Save some LSNs for comparisons.
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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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SELECT pg_current_wal_lsn() AS wal_lsn2 \gset
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INSERT INTO sample_tbl SELECT * FROM generate_series(3, 4);
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-- ===================================================================
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-- Tests for input validation
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-- ===================================================================
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-- Invalid input LSN.
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SELECT * FROM pg_get_wal_record_info('0/0');
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-- Invalid start LSN.
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SELECT * FROM pg_get_wal_records_info('0/0', :'wal_lsn1');
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SELECT * FROM pg_get_wal_stats('0/0', :'wal_lsn1');
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SELECT * FROM pg_get_wal_block_info('0/0', :'wal_lsn1');
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-- Start LSN > End LSN.
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SELECT * FROM pg_get_wal_records_info(:'wal_lsn2', :'wal_lsn1');
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SELECT * FROM pg_get_wal_stats(:'wal_lsn2', :'wal_lsn1');
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SELECT * FROM pg_get_wal_block_info(:'wal_lsn2', :'wal_lsn1');
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-- LSNs with the highest value possible.
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SELECT * FROM pg_get_wal_record_info('FFFFFFFF/FFFFFFFF');
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-- Success with end LSNs.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_stats(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
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-- Failures with start LSNs.
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SELECT * FROM pg_get_wal_records_info('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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SELECT * FROM pg_get_wal_stats('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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SELECT * FROM pg_get_wal_block_info('FFFFFFFF/FFFFFFFE', 'FFFFFFFF/FFFFFFFF');
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-- ===================================================================
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-- Tests for all function executions
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-- ===================================================================
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_record_info(:'wal_lsn1');
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2');
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_stats(:'wal_lsn1', :'wal_lsn2');
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', :'wal_lsn2');
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-- ===================================================================
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-- Test for filtering out WAL records of a particular table
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-- ===================================================================
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SELECT oid AS sample_tbl_oid FROM pg_class WHERE relname = 'sample_tbl' \gset
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
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WHERE block_ref LIKE concat('%', :'sample_tbl_oid', '%') AND resource_manager = 'Heap';
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-- ===================================================================
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-- Test for filtering out WAL records based on resource_manager and
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-- record_type
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-- ===================================================================
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2')
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WHERE resource_manager = 'Heap' AND record_type = 'INSERT';
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-- ===================================================================
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-- Tests to get block information from WAL record
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-- ===================================================================
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-- Update table to generate some block data.
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SELECT pg_current_wal_lsn() AS wal_lsn3 \gset
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UPDATE sample_tbl SET col1 = col1 + 1 WHERE col1 = 1;
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SELECT pg_current_wal_lsn() AS wal_lsn4 \gset
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-- Check if we get block data from WAL record.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn3', :'wal_lsn4')
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WHERE relfilenode = :'sample_tbl_oid' AND block_data IS NOT NULL;
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-- Force full-page image on the next update.
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SELECT pg_current_wal_lsn() AS wal_lsn5 \gset
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CHECKPOINT;
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UPDATE sample_tbl SET col1 = col1 + 1 WHERE col1 = 2;
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SELECT pg_current_wal_lsn() AS wal_lsn6 \gset
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-- Check if we get FPI from WAL record.
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SELECT COUNT(*) >= 1 AS ok FROM pg_get_wal_block_info(:'wal_lsn5', :'wal_lsn6')
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WHERE relfilenode = :'sample_tbl_oid' AND block_fpi_data IS NOT NULL;
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-- ===================================================================
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-- Tests for permissions
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-- ===================================================================
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CREATE ROLE regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- no
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- no
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-- Functions accessible by users with role pg_read_server_files.
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GRANT pg_read_server_files TO regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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REVOKE pg_read_server_files FROM regress_pg_walinspect;
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-- Superuser can grant execute to other users.
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GRANT EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
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TO regress_pg_walinspect;
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GRANT EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn, boolean)
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TO regress_pg_walinspect;
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_record_info(pg_lsn)', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_records_info(pg_lsn, pg_lsn) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_stats(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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SELECT has_function_privilege('regress_pg_walinspect',
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'pg_get_wal_block_info(pg_lsn, pg_lsn, boolean) ', 'EXECUTE'); -- yes
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REVOKE EXECUTE ON FUNCTION pg_get_wal_record_info(pg_lsn)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_records_info(pg_lsn, pg_lsn)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_stats(pg_lsn, pg_lsn, boolean)
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FROM regress_pg_walinspect;
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REVOKE EXECUTE ON FUNCTION pg_get_wal_block_info(pg_lsn, pg_lsn, boolean)
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FROM regress_pg_walinspect;
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-- ===================================================================
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-- Clean up
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-- ===================================================================
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DROP ROLE regress_pg_walinspect;
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SELECT pg_drop_replication_slot('regress_pg_walinspect_slot');
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DROP TABLE sample_tbl;
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DROP EXTENSION pg_walinspect;
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