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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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3
mysql-test/suite/encryption/r/innodb-spatial-index.result
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@@ -38,6 +38,9 @@ INSERT INTO t2 values(1, 'secret', ST_GeomFromText('POINT(903994614 180726515)')
SELECT NAME FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION > 0;
NAME
innodb_system
innodb_undo001
innodb_undo002
innodb_undo003
mysql/innodb_index_stats
mysql/innodb_table_stats
mysql/transaction_registry