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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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16
mysql-test/suite/innodb_fts/r/innodb_fts_transaction.result
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@@ -534,8 +534,8 @@ INSERT INTO t1 (a,b) VALUES
('Sævör grét', 'áðan því úlpan var ónýt');
connect con2,localhost,root,,;
SET NAMES UTF8;
select @@session.tx_isolation;
@@session.tx_isolation
select @@session.transaction_isolation;
@@session.transaction_isolation
REPEATABLE-READ
CREATE FULLTEXT INDEX idx on t1 (a,b);
INSERT INTO t1 (a,b) VALUES
@@ -649,8 +649,8 @@ INSERT INTO t1 (a,b) VALUES
('Я могу есть стекло', 'оно мне Mне вредит');
connect con2,localhost,root,,;
SET NAMES UTF8;
select @@session.tx_isolation;
@@session.tx_isolation
select @@session.transaction_isolation;
@@session.transaction_isolation
REPEATABLE-READ
CREATE FULLTEXT INDEX idx on t1 (a,b);
INSERT INTO t1 (a,b) VALUES
@@ -794,8 +794,8 @@ INSERT INTO t1 (a,b) VALUES
('Sævör grét', 'áðan því úlpan var ónýt');
connect con2,localhost,root,,;
SET NAMES UTF8;
select @@session.tx_isolation;
@@session.tx_isolation
select @@session.transaction_isolation;
@@session.transaction_isolation
REPEATABLE-READ
CREATE FULLTEXT INDEX idx on t1 (a,b);
INSERT INTO t1 (a,b) VALUES
@@ -914,8 +914,8 @@ INSERT INTO t1 (a,b) VALUES
('Я могу есть стекло', 'оно мне Mне вредит');
connect con2,localhost,root,,;
SET NAMES UTF8;
select @@session.tx_isolation;
@@session.tx_isolation
select @@session.transaction_isolation;
@@session.transaction_isolation
REPEATABLE-READ
CREATE FULLTEXT INDEX idx on t1 (a,b);
INSERT INTO t1 (a,b) VALUES