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MDEV-21921 Make transaction_isolation and transaction_read_only into system variables

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In MariaDB, we have a confusing problem where:
* The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically.
* The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file.

Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only.

MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html

This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
This commit is contained in:
Junqi Xie
2023-03-12 13:55:30 +08:00
committed by Daniel Black
parent 4472a7b4ff
commit d20a96f9c1
100 changed files with 1232 additions and 962 deletions
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2
mysql-test/suite/engines/rr_trx/include/rr_init.test
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@@ -17,7 +17,7 @@ if (`SELECT @@default_storage_engine LIKE 'InnoDB' AND @@version LIKE '%6.%'`)
SHOW VARIABLES LIKE 'default_storage_engine';
# Verify default isolation level
SHOW VARIABLES LIKE 'tx_isolation';
SHOW VARIABLES LIKE 'transaction_isolation';
#
# Create table for keeping track of test metadata/statistics (counters etc.).