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MDEV-29986 Set innodb_undo_tablespaces=3 by default

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Starting with commit baf276e6d4 (MDEV-19229)
the parameter innodb_undo_tablespaces can be increased from its
previous default value 0 while allowing an upgrade from old databases.

We will change the default setting to innodb_undo_tablespaces=3
so that the space occupied by possible bursts of undo log records
can be reclaimed after SET GLOBAL innodb_undo_log_truncate=ON.

We will not enable innodb_undo_log_truncate by default, because it
causes some observable performance degradation.

Special thanks to Thirunarayanan Balathandayuthapani for diagnosing
and fixing a number of bugs related to this new default setting.

Tested by: Matthias Leich, Axel Schwenke, Vladislav Vaintroub
(with both values of innodb_undo_log_truncate)
This commit is contained in:
Marko Mäkelä
2023-01-13 12:46:30 +02:00
parent d6d85c92ee
commit 44dce3b207
11 changed files with 30 additions and 11 deletions
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2
mysql-test/suite/innodb/r/innodb-system-table-view.result
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@ -10,7 +10,7 @@ TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE
11 SYS_FOREIGN 0 7 0 Redundant 0 System
12 SYS_FOREIGN_COLS 0 7 0 Redundant 0 System
13 SYS_VIRTUAL 0 6 0 Redundant 0 System
16 mysql/transaction_registry 33 8 3 Dynamic 0 Single
16 mysql/transaction_registry 33 8 6 Dynamic 0 Single
SELECT table_id,pos,mtype,prtype,len,name
FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
WHERE table_id NOT IN (@table_stats_id, @index_stats_id)