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MDEV-35124 Set innodb_snapshot_isolation=ON by default

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From the very beginning, the default InnoDB transaction isolation level
REPEATABLE READ does not correspond to any well formed definition.
The main issue is the lack of write/write conflict detection.
To fix that and to make REPEATABLE READ correspond to Snapshot Isolation,
b8a6719889 introduced the Boolean
session variable innodb_snapshot_isolation. It was disabled by default
in order not to break any user applications.

In a new major version of MariaDB Server, we had better enable this
parameter by default.
This commit is contained in:
Marko Mäkelä
2024-10-11 15:02:31 +03:00
parent 26dce1cec3
commit 4e1e9ea6f3
28 changed files with 35 additions and 3 deletions
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2
mysql-test/suite/innodb/r/innodb-isolation.result
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@ -80,6 +80,7 @@ COUNT(*)
#
# Do some DML in the default connection and leave the transaction pending.
#
SET innodb_snapshot_isolation=OFF;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN;
UPDATE t1 SET c2 = c2 * 3 WHERE c1 = 1;
@ -140,6 +141,7 @@ COUNT(*)
# Connection 1 REPEATABLE READ
#
connect con1,localhost,root,,;
SET innodb_snapshot_isolation=OFF;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN;
########## innodb_isolation_selects.inc ##########