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Rework design of functions in pg_walinspect

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This commit reworks a bit the set-returning functions of pg_walinspect,
making them more flexible regarding their end LSN:
- pg_get_wal_records_info()
- pg_get_wal_stats()
- pg_get_wal_block_info()

The end LSNs given to these functions is now handled so as a value
higher than the current LSN of the cluster (insert LSN for a primary, or
replay LSN for a standby) does not raise an error, giving more
flexibility to monitoring queries.  Instead, the functions return
results up to the current LSN, as found at the beginning of each
function call.

As an effect of that, pg_get_wal_records_info_till_end_of_wal() and
pg_get_wal_stats_till_end_of_wal() are now removed from 1.1, as the
existing, equivalent functions are able to offer the same
possibilities.

Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACU0_q-o4DSweyaW9NO1KBx-QkN6G_OzYQvpjf3CZVASkg@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-03-14 20:13:02 +09:00
parent d5d574146d
commit 5c1b662807
7 changed files with 185 additions and 208 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
contrib/pg_walinspect/sql/pg_walinspect.sql
View File

@ -33,9 +33,7 @@ SELECT * FROM pg_get_wal_block_info(:'wal_lsn2', :'wal_lsn1');
-- LSNs with the highest value possible.
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info('FFFFFFFF/FFFFFFFF');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info_till_end_of_wal('FFFFFFFF/FFFFFFFF');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats_till_end_of_wal('FFFFFFFF/FFFFFFFF');
-- failures with end LSNs
-- Success with end LSNs.
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', 'FFFFFFFF/FFFFFFFF');
@ -49,8 +47,6 @@ SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info('FFFFFFFF/FFFFFFFE', 'FFFF
-- ===================================================================
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_record_info(:'wal_lsn1');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info_till_end_of_wal(:'wal_lsn1');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats_till_end_of_wal(:'wal_lsn1');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_records_info(:'wal_lsn1', :'wal_lsn2');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_stats(:'wal_lsn1', :'wal_lsn2');
SELECT COUNT(*) >= 0 AS ok FROM pg_get_wal_block_info(:'wal_lsn1', :'wal_lsn2');