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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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8
mysql-test/suite/perfschema/r/transaction.result
View File

@ -39,8 +39,8 @@ CALL clear_transaction_tables();
# ========================================================================
#
connection con1;
SELECT @@global.tx_isolation;
@@global.tx_isolation
SELECT @@global.transaction_isolation;
@@global.transaction_isolation
REPEATABLE-READ
SELECT @@global.autocommit;
@@global.autocommit
@ -48,8 +48,8 @@ SELECT @@global.autocommit;
SELECT @@global.binlog_format;
@@global.binlog_format
ROW
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
REPEATABLE-READ
SELECT @@autocommit;
@@autocommit

4
mysql-test/suite/perfschema/t/transaction.test
View File

@ -90,10 +90,10 @@ CALL clear_transaction_tables();
--echo # ========================================================================
--echo #
--connection con1
SELECT @@global.tx_isolation;
SELECT @@global.transaction_isolation;
SELECT @@global.autocommit;
SELECT @@global.binlog_format;
SELECT @@tx_isolation;
SELECT @@transaction_isolation;
SELECT @@autocommit;
SELECT @@binlog_format;