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d20a96f9c1
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.
141 lines
6 KiB
Text
141 lines
6 KiB
Text
SET @global_start_value = @@global.transaction_isolation;
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SELECT @global_start_value;
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@global_start_value
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REPEATABLE-READ
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SET @session_start_value = @@session.transaction_isolation;
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SELECT @session_start_value;
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@session_start_value
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REPEATABLE-READ
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'#--------------------FN_DYNVARS_183_01------------------------#'
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SET @@global.transaction_isolation = 'READ-UNCOMMITTED';
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SET @@global.transaction_isolation = DEFAULT;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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REPEATABLE-READ
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SET @@session.transaction_isolation = DEFAULT;
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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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'#---------------------FN_DYNVARS_183_02-------------------------#'
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SET @@global.transaction_isolation = NULL;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'NULL'
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SET @@global.transaction_isolation = '';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of ''
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SET @@session.transaction_isolation = NULL;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'NULL'
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SET @@session.transaction_isolation = '';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of ''
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'#--------------------FN_DYNVARS_183_03------------------------#'
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SET @@global.transaction_isolation = 'READ-UNCOMMITTED';
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-UNCOMMITTED
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SET @@global.transaction_isolation = 'read-COMMITTED';
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-COMMITTED
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SET @@global.transaction_isolation = 'REPEATABLE-READ';
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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REPEATABLE-READ
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SET @@global.transaction_isolation = 'SERIALIZable';
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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SERIALIZABLE
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SET @@session.transaction_isolation = 'READ-UNCOMMITTED';
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SELECT @@session.transaction_isolation;
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@@session.transaction_isolation
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READ-UNCOMMITTED
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SET @@session.transaction_isolation = 'READ-COMMITTED';
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SELECT @@session.transaction_isolation;
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@@session.transaction_isolation
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READ-COMMITTED
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SET @@session.transaction_isolation = 'REPEATABLE-READ';
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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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SET @@session.transaction_isolation = 'serializable';
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SELECT @@session.transaction_isolation;
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@@session.transaction_isolation
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SERIALIZABLE
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'#--------------------FN_DYNVARS_183_04-------------------------#'
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SET @@global.transaction_isolation = -1;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of '-1'
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SET @@global.transaction_isolation = READUNCOMMITTED;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'READUNCOMMITTED'
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SET @@global.transaction_isolation = 'REPEATABLE';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'REPEATABLE'
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SET @@global.transaction_isolation = OFF;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'OFF'
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SET @@global.transaction_isolation = ON;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'ON'
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SET @@global.transaction_isolation = 'NON-SERIALIZABLE';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'NON-SERIALIZABLE'
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SET @@transaction_isolation = -1;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of '-1'
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SET @@transaction_isolation = READUNCOMMITTED;
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'READUNCOMMITTED'
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SET @@transaction_isolation = 'REPEATABLE';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'REPEATABLE'
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SET @@transaction_isolation = 'NONE';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'NONE'
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SET @@transaction_isolation = 'ALL';
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ERROR 42000: Variable 'transaction_isolation' can't be set to the value of 'ALL'
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'#-------------------FN_DYNVARS_183_05----------------------------#'
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SELECT @@session.transaction_isolation = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.SESSION_VARIABLES
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WHERE VARIABLE_NAME='transaction_isolation';
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@@session.transaction_isolation = VARIABLE_VALUE
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1
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'#----------------------FN_DYNVARS_183_06------------------------#'
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SELECT @@global.transaction_isolation = VARIABLE_VALUE
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FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
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WHERE VARIABLE_NAME='transaction_isolation';
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@@global.transaction_isolation = VARIABLE_VALUE
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1
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'#---------------------FN_DYNVARS_183_07-------------------------#'
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SET @@global.transaction_isolation = 0;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-UNCOMMITTED
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SET @@global.transaction_isolation = 1;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-COMMITTED
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SET @@global.transaction_isolation = 2;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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REPEATABLE-READ
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SET @@global.transaction_isolation = 3;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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SERIALIZABLE
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SET @@global.transaction_isolation = 0.4;
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ERROR 42000: Incorrect argument type to variable 'transaction_isolation'
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'#---------------------FN_DYNVARS_183_08----------------------#'
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SET @@global.transaction_isolation = TRUE;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-COMMITTED
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SET @@global.transaction_isolation = FALSE;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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READ-UNCOMMITTED
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'#---------------------FN_DYNVARS_183_09----------------------#'
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SET transaction_isolation = 'REPEATABLE-READ';
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SET session transaction_isolation = 'REPEATABLE-READ';
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SELECT @@transaction_isolation;
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@@transaction_isolation
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REPEATABLE-READ
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SET global transaction_isolation = 'REPEATABLE-READ';
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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REPEATABLE-READ
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SET @@global.transaction_isolation = @global_start_value;
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SELECT @@global.transaction_isolation;
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@@global.transaction_isolation
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REPEATABLE-READ
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SET @@session.transaction_isolation = @session_start_value;
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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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