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| author | Peter Geoghegan <pg@bowt.ie> | 2023-04-07 16:08:52 -0700 |
|---|---|---|
| committer | Peter Geoghegan <pg@bowt.ie> | 2023-04-07 16:08:52 -0700 |
| commit | 7d8219a444bd917d21234c97e2417a410f10ebd3 (patch) | |
| tree | a4bf646294fb51f5bef2d7595dafab66a0fe9e2c /doc | |
| parent | 76c111a7f16659f9018391f655764c8226461ca4 (diff) | |
| download | postgresql-7d8219a444bd917d21234c97e2417a410f10ebd3.tar.gz | |
Show more detail in heapam rmgr descriptions.
Add helper functions that output arrays in a standard format, and use
the functions inside heapdesc routines. This allows tools like
pg_walinspect to show a detailed description of the page offset number
arrays for records like PRUNE and VACUUM (unless there was an FPI).
Also document the conventions that desc routines should follow. Only
the heapdesc routines follow the conventions for now, so they're just
guidelines for the time being.
Based on a suggestion from Andres Freund.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-By: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/flat/20230109215842.fktuhesvayno6o4g%40awork3.anarazel.de
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/sgml/pgwalinspect.sgml | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/doc/src/sgml/pgwalinspect.sgml b/doc/src/sgml/pgwalinspect.sgml index d9ed8f0a9a..b3712be009 100644 --- a/doc/src/sgml/pgwalinspect.sgml +++ b/doc/src/sgml/pgwalinspect.sgml @@ -71,19 +71,19 @@ after the <replaceable>in_lsn</replaceable> argument. For example: <screen> -postgres=# SELECT * FROM pg_get_wal_record_info('0/1E826E98'); --[ RECORD 1 ]----+---------------------------------------------------- -start_lsn | 0/1E826F20 -end_lsn | 0/1E826F60 -prev_lsn | 0/1E826C80 +postgres=# SELECT * FROM pg_get_wal_record_info('0/E84F5E8'); +-[ RECORD 1 ]----+-------------------------------------------------- +start_lsn | 0/E84F5E8 +end_lsn | 0/E84F620 +prev_lsn | 0/E84F5A8 xid | 0 resource_manager | Heap2 -record_type | PRUNE -record_length | 58 -main_data_length | 8 +record_type | VACUUM +record_length | 50 +main_data_length | 2 fpi_length | 0 -description | snapshotConflictHorizon 33748 nredirected 0 ndead 2 -block_ref | blkref #0: rel 1663/5/60221 fork main blk 2 +description | nunused: 1, unused: [ 22 ] +block_ref | blkref #0: rel 1663/16389/20884 fork main blk 126 </screen> </para> <para> @@ -144,7 +144,7 @@ block_ref | references. Returns one row per block reference per WAL record. For example: <screen> -postgres=# SELECT * FROM pg_get_wal_block_info('0/10E9D80', '0/10E9DC0') LIMIT 1; +postgres=# SELECT * FROM pg_get_wal_block_info('0/10E9D80', '0/10E9DC0'); -[ RECORD 1 ]-----+----------------------------------- start_lsn | 0/10E9D80 end_lsn | 0/10E9DC0 |