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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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28
mysql-test/suite/innodb/r/innodb_bug53756.result
View File

@@ -9,8 +9,8 @@ COMMIT;
# Start a transaction in the default connection for isolation.
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
SELECT * FROM bug_53756;
pk c1
@@ -20,38 +20,38 @@ pk c1
4 44
connect con1,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
DELETE FROM bug_53756 WHERE pk=1;
connect con2,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
DELETE FROM bug_53756 WHERE pk=2;
connect con3,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
UPDATE bug_53756 SET c1=77 WHERE pk=3;
connect con4,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
UPDATE bug_53756 SET c1=88 WHERE pk=4;
connect con5,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
INSERT INTO bug_53756 VALUES(5, 55);
connect con6,localhost,root,,;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
SELECT @@transaction_isolation;
@@transaction_isolation
READ-COMMITTED
INSERT INTO bug_53756 VALUES(6, 66);
connection con1;