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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.
139 lines
5.9 KiB
Text
139 lines
5.9 KiB
Text
#
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# MDEV-21921 Make transaction_isolation and transaction_read_only into
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# system variables
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#
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SET @saved_global_isolation= @@global.transaction_isolation;
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SET @saved_global_read_only= @@global.transaction_read_only;
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# Case 1: Check the influence of --transaction_* on
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# @@session.transaction_* and @@global.transaction_*,
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# @@session.tx_*, @@global.tx_*.
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SELECT @@session.transaction_isolation, @@global.transaction_isolation,
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@@session.tx_isolation, @@global.tx_isolation;
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@@session.transaction_isolation @@global.transaction_isolation @@session.tx_isolation @@global.tx_isolation
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SERIALIZABLE SERIALIZABLE SERIALIZABLE SERIALIZABLE
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SHOW GLOBAL VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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SELECT @@session.transaction_read_only, @@global.transaction_read_only,
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@@session.tx_read_only, @@global.tx_read_only;
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@@session.transaction_read_only @@global.transaction_read_only @@session.tx_read_only @@global.tx_read_only
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1 1 1 1
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SHOW GLOBAL VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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# Case 2: Check that the change to tx_* is reflected to transaction_*.
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SET tx_isolation= 'REPEATABLE-READ';
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Warnings:
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Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead
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SET @@global.tx_isolation= 'SERIALIZABLE';
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Warnings:
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Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead
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SELECT @@session.tx_isolation, @@global.tx_isolation,
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@@session.transaction_isolation, @@global.transaction_isolation;
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@@session.tx_isolation @@global.tx_isolation @@session.transaction_isolation @@global.transaction_isolation
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REPEATABLE-READ SERIALIZABLE REPEATABLE-READ SERIALIZABLE
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SHOW GLOBAL VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation REPEATABLE-READ
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tx_isolation REPEATABLE-READ
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SET STATEMENT tx_isolation= 'SERIALIZABLE' FOR SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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Warnings:
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Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead
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Warning 1287 '@@tx_isolation' is deprecated and will be removed in a future release. Please use '@@transaction_isolation' instead
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SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation REPEATABLE-READ
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tx_isolation REPEATABLE-READ
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SET tx_read_only= OFF;
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Warnings:
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Warning 1287 '@@tx_read_only' is deprecated and will be removed in a future release. Please use '@@transaction_read_only' instead
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SET @@global.tx_read_only= ON;
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Warnings:
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Warning 1287 '@@tx_read_only' is deprecated and will be removed in a future release. Please use '@@transaction_read_only' instead
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SELECT @@session.tx_read_only, @@global.tx_read_only,
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@@session.transaction_read_only, @@global.transaction_read_only;
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@@session.tx_read_only @@global.tx_read_only @@session.transaction_read_only @@global.transaction_read_only
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0 1 0 1
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SHOW GLOBAL VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only OFF
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tx_read_only OFF
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SET STATEMENT tx_read_only= ON FOR SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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Warnings:
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Warning 1287 '@@tx_read_only' is deprecated and will be removed in a future release. Please use '@@transaction_read_only' instead
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Warning 1287 '@@tx_read_only' is deprecated and will be removed in a future release. Please use '@@transaction_read_only' instead
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SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only OFF
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tx_read_only OFF
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# Case 3: Check that the change to transaction_* is reflected to tx_*.
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SET transaction_isolation= 'SERIALIZABLE';
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SET @@global.transaction_isolation= 'REPEATABLE-READ';
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SELECT @@session.tx_isolation, @@global.tx_isolation,
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@@session.transaction_isolation, @@global.transaction_isolation;
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@@session.tx_isolation @@global.tx_isolation @@session.transaction_isolation @@global.transaction_isolation
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SERIALIZABLE REPEATABLE-READ SERIALIZABLE REPEATABLE-READ
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SHOW GLOBAL VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation REPEATABLE-READ
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tx_isolation REPEATABLE-READ
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SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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SET STATEMENT transaction_isolation= 'REPEATABLE-READ' FOR SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation REPEATABLE-READ
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tx_isolation REPEATABLE-READ
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SHOW SESSION VARIABLES LIKE '%_isolation';
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Variable_name Value
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transaction_isolation SERIALIZABLE
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tx_isolation SERIALIZABLE
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SET transaction_read_only= ON;
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SET @@global.transaction_read_only= OFF;
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SELECT @@session.tx_read_only, @@global.tx_read_only,
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@@session.transaction_read_only, @@global.transaction_read_only;
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@@session.tx_read_only @@global.tx_read_only @@session.transaction_read_only @@global.transaction_read_only
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1 0 1 0
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SHOW GLOBAL VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only OFF
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tx_read_only OFF
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SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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SET STATEMENT transaction_read_only= OFF FOR SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only OFF
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tx_read_only OFF
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SHOW SESSION VARIABLES LIKE '%_read_only';
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Variable_name Value
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transaction_read_only ON
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tx_read_only ON
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SET @@global.transaction_isolation= @saved_global_isolation;
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SET @@global.transaction_read_only= @saved_global_read_only;
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