122 lines
4.3 KiB
Plaintext
122 lines
4.3 KiB
Plaintext
SET @start_global_value = @@global.innodb_rollback_segments;
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SELECT @start_global_value;
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@start_global_value
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128
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#
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# Default value is 128 and exists as global only
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#
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SELECT @@GLOBAL.innodb_rollback_segments;
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@@GLOBAL.innodb_rollback_segments
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128
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SELECT @@GLOBAL.innodb_rollback_segments >=0;
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@@GLOBAL.innodb_rollback_segments >=0
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1
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SELECT @@GLOBAL.innodb_rollback_segments <=128;
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@@GLOBAL.innodb_rollback_segments <=128
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1
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SELECT COUNT(@@GLOBAL.innodb_rollback_segments);
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COUNT(@@GLOBAL.innodb_rollback_segments)
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1
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SELECT COUNT(@@innodb_rollback_segments);
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COUNT(@@innodb_rollback_segments)
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1
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SHOW GLOBAL variables LIKE 'innodb_rollback_segments';
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Variable_name Value
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innodb_rollback_segments 128
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SHOW SESSION variables LIKE 'innodb_rollback_segments';
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Variable_name Value
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innodb_rollback_segments 128
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# Expected below: error 'Variable is a GLOBAL variable'
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SELECT @@SESSION.innodb_rollback_segments;
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ERROR HY000: Variable 'innodb_rollback_segments' is a GLOBAL variable
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SELECT COUNT(@@SESSION.innodb_rollback_segments);
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ERROR HY000: Variable 'innodb_rollback_segments' is a GLOBAL variable
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SELECT innodb_rollback_segments = @@SESSION.innodb_rollback_segments;
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ERROR 42S22: Unknown column 'innodb_rollback_segments' in 'field list'
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SELECT @@LOCAL.innodb_rollback_segments;
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ERROR HY000: Variable 'innodb_rollback_segments' is a GLOBAL variable
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SELECT COUNT(@@LOCAL.innodb_rollback_segments);
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ERROR HY000: Variable 'innodb_rollback_segments' is a GLOBAL variable
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SELECT innodb_rollback_segments = @@LOCAL.innodb_rollback_segments;
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ERROR 42S22: Unknown column 'innodb_rollback_segments' in 'field list'
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#
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# Check if accessing variable with and without GLOBAL point to same variable
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#
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SELECT @@innodb_rollback_segments = @@GLOBAL.innodb_rollback_segments;
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@@innodb_rollback_segments = @@GLOBAL.innodb_rollback_segments
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1
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#
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# Check if the value in GLOBAL table matches value in performance_schema
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#
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SELECT * FROM performance_schema.global_variables
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WHERE variable_name='innodb_rollback_segments';
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VARIABLE_NAME VARIABLE_VALUE
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innodb_rollback_segments 128
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SELECT * FROM performance_schema.session_variables
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WHERE variable_name='innodb_rollback_segments';
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VARIABLE_NAME VARIABLE_VALUE
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innodb_rollback_segments 128
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#
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# Check if value can be set
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#
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SET GLOBAL innodb_rollback_segments=100;
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Warnings:
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Warning 1292 Truncated incorrect innodb_rollback_segments value: '100'
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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SELECT * FROM performance_schema.global_variables
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WHERE variable_name='innodb_rollback_segments';
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VARIABLE_NAME VARIABLE_VALUE
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innodb_rollback_segments 128
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SELECT * FROM performance_schema.session_variables
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WHERE variable_name='innodb_rollback_segments';
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VARIABLE_NAME VARIABLE_VALUE
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innodb_rollback_segments 128
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SET SESSION innodb_rollback_segments=101;
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ERROR HY000: Variable 'innodb_rollback_segments' is a GLOBAL variable and should be set with SET GLOBAL
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#
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# Valid values are 1 - 128
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#
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SET GLOBAL innodb_rollback_segments=1.1;
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ERROR 42000: Incorrect argument type to variable 'innodb_rollback_segments'
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SET GLOBAL innodb_rollback_segments=1e1;
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ERROR 42000: Incorrect argument type to variable 'innodb_rollback_segments'
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SET GLOBAL innodb_rollback_segments="foo";
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ERROR 42000: Incorrect argument type to variable 'innodb_rollback_segments'
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SET GLOBAL innodb_rollback_segments=-7;
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Warnings:
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Warning 1292 Truncated incorrect innodb_rollback_segments value: '-7'
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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SET GLOBAL innodb_rollback_segments=0;
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Warnings:
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Warning 1292 Truncated incorrect innodb_rollback_segments value: '0'
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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SET GLOBAL innodb_rollback_segments=50;
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Warnings:
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Warning 1292 Truncated incorrect innodb_rollback_segments value: '50'
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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SET GLOBAL innodb_rollback_segments=129;
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Warnings:
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Warning 1292 Truncated incorrect innodb_rollback_segments value: '129'
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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SELECT * FROM performance_schema.global_variables
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WHERE variable_name='innodb_rollback_segments';
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VARIABLE_NAME VARIABLE_VALUE
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innodb_rollback_segments 128
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#
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# cleanup
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#
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SET @@global.innodb_rollback_segments = @start_global_value;
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SELECT @@global.innodb_rollback_segments;
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@@global.innodb_rollback_segments
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128
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