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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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4
mysql-test/suite/innodb/t/innodb-blob.test
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@@ -60,7 +60,7 @@ INSERT INTO t1 VALUES (3,REPEAT('c',50000));
connection con1;
SET DEBUG_SYNC='now WAIT_FOR rec_not_blob';
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT @@tx_isolation;
SELECT @@transaction_isolation;
# this one should see (3,NULL_BLOB)
SELECT a, RIGHT(b,20) FROM t1;
@@ -98,7 +98,7 @@ UPDATE t3 SET c=REPEAT('f',3000) WHERE a=1;
connect (con1,localhost,root,,);
SET DEBUG_SYNC='now WAIT_FOR go_sel';
SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT @@tx_isolation;
SELECT @@transaction_isolation;
SELECT a, RIGHT(b,20), RIGHT(c,20) FROM t3;
set debug_sync='now SIGNAL go_upd';