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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/main/concurrent_innodb_unsafelog.result
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@ -1,11 +1,11 @@
SET @save_timeout = @@GLOBAL.innodb_lock_wait_timeout;
SET GLOBAL innodb_lock_wait_timeout = 1;
SET @save_isolation = @@GLOBAL.tx_isolation;
SET @save_isolation = @@GLOBAL.transaction_isolation;
SET GLOBAL TRANSACTION ISOLATION LEVEL READ COMMITTED;
connection default;
SET SQL_MODE="";
SELECT @@global.tx_isolation;
@@global.tx_isolation
SELECT @@global.transaction_isolation;
@@global.transaction_isolation
READ-COMMITTED
# keep_locks == 0
GRANT ALL ON test.* TO mysqltest@localhost;
@ -791,4 +791,4 @@ drop table t1;
drop user mysqltest@localhost;
SET SQL_MODE=default;
SET GLOBAL innodb_lock_wait_timeout = @save_timeout;
SET GLOBAL tx_isolation = @save_isolation;
SET GLOBAL transaction_isolation = @save_isolation;