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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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12
mysql-test/suite/innodb/r/innodb.result
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@@ -1017,8 +1017,8 @@ SET sql_mode = default;
create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) engine=innodb;
BEGIN;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SELECT @@tx_isolation,@@global.tx_isolation;
@@tx_isolation @@global.tx_isolation
SELECT @@transaction_isolation, @@global.transaction_isolation;
@@transaction_isolation @@global.transaction_isolation
SERIALIZABLE REPEATABLE-READ
insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David');
select id, code, name from t1 order by id;
@@ -3141,7 +3141,7 @@ CONNECT c1,localhost,root,,;
CONNECT c2,localhost,root,,;
connection c1;
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET TRANSACTION_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
DROP TABLE IF EXISTS t1, t2;
Warnings:
@@ -3152,7 +3152,7 @@ SELECT * FROM t2;
a
connection c2;
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET TRANSACTION_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (1);
COMMIT;
@@ -3166,13 +3166,13 @@ CONNECT c1,localhost,root,,;
CONNECT c2,localhost,root,,;
connection c1;
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET TRANSACTION_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
SELECT * FROM t2;
a
connection c2;
SET binlog_format='MIXED';
SET TX_ISOLATION='read-committed';
SET TRANSACTION_ISOLATION='read-committed';
SET AUTOCOMMIT=0;
INSERT INTO t1 VALUES (2);
COMMIT;