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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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20
mysql-test/suite/innodb/r/temporary_table.result
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@ -709,12 +709,12 @@ UPDATE t1 SET a= 2;
COMMIT;
DROP TABLE t1;
CREATE TEMPORARY TABLE t(c INT) ENGINE=InnoDB;
SET SESSION tx_read_only=TRUE;
SET SESSION TRANSACTION_READ_ONLY=TRUE;
LOCK TABLE test.t READ;
SELECT * FROM t;
c
INSERT INTO t VALUES(0xADC3);
SET SESSION tx_read_only=FALSE;
SET SESSION TRANSACTION_READ_ONLY=FALSE;
DROP TABLE t;
CREATE TEMPORARY TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
@ -748,27 +748,27 @@ COMMIT;
DROP TABLE t1;
CREATE TEMPORARY TABLE tmp (a INT) ENGINE=InnoDB;
INSERT INTO tmp () VALUES (),();
SET TX_READ_ONLY= 1;
SET TRANSACTION_READ_ONLY= 1;
INSERT INTO tmp SELECT * FROM tmp;
SET TX_READ_ONLY= 0;
SET TRANSACTION_READ_ONLY= 0;
DROP TABLE tmp;
SET sql_mode='';
SET GLOBAL tx_read_only=TRUE;
SET GLOBAL TRANSACTION_READ_ONLY=TRUE;
CREATE TEMPORARY TABLE t (c INT);
SET SESSION tx_read_only=DEFAULT;
SET SESSION TRANSACTION_READ_ONLY=DEFAULT;
INSERT INTO t VALUES(1);
INSERT INTO t SELECT * FROM t;
SET SESSION tx_read_only=FALSE;
SET GLOBAL tx_read_only=OFF;
SET SESSION TRANSACTION_READ_ONLY=FALSE;
SET GLOBAL TRANSACTION_READ_ONLY=OFF;
DROP TABLE t;
CREATE TEMPORARY TABLE t(a INT);
SET SESSION tx_read_only=ON;
SET SESSION TRANSACTION_READ_ONLY=ON;
LOCK TABLE t READ;
SELECT COUNT(*)FROM t;
COUNT(*)
0
INSERT INTO t VALUES (0);
SET SESSION tx_read_only=OFF;
SET SESSION TRANSACTION_READ_ONLY=OFF;
DROP TABLE t;
CREATE TEMPORARY TABLE t (a INT) ENGINE=InnoDB;
INSERT INTO t VALUES (1);