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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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6
mysql-test/suite/innodb/r/innodb_lock_wait_timeout_1.result
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@@ -87,9 +87,9 @@ drop table t1, t2;
# handler::unlock_row() in InnoDB does nothing.
# Thus in order to reproduce the condition that led to the
# warning, one needs to relax isolation by either
# setting a weaker tx_isolation value, or by turning on
# setting a weaker transaction_isolation value, or by turning on
# the unsafe replication switch.
set @@session.tx_isolation="read-committed";
set @@session.transaction_isolation="read-committed";
# Prepare data. We need a table with a unique index,
# for join_read_key to be used. The other column
# allows to control what passes WHERE clause filter.
@@ -354,7 +354,7 @@ ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection default;
commit;
disconnect con1;
set @@session.tx_isolation=default;
set @@session.transaction_isolation=default;
drop table t1;
#
# End of 5.1 tests