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MDEV-21921 Make transaction_isolation and transaction_read_only into system variables
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.
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@ -12,8 +12,8 @@
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# This test makes sense only in REPEATABLE-READ mode as
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# in SERIALIZABLE mode all statements that read data take
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# shared lock on them to enforce its semantics.
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select @@session.tx_isolation;
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@@session.tx_isolation
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select @@session.transaction_isolation;
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@@session.transaction_isolation
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REPEATABLE-READ
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# Prepare playground by creating tables, views,
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# routines and triggers used in tests.
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