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39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
SET @start_global_value = @@global.expensive_subquery_limit;
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SELECT @start_global_value;
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#
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# exists as global and session
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#
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select @@global.expensive_subquery_limit;
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select @@session.expensive_subquery_limit;
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show global variables like 'expensive_subquery_limit';
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show session variables like 'expensive_subquery_limit';
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select * from information_schema.global_variables where variable_name='expensive_subquery_limit';
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select * from information_schema.session_variables where variable_name='expensive_subquery_limit';
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#
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# show that it's writable
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#
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set global expensive_subquery_limit=10;
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set session expensive_subquery_limit=20;
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select @@global.expensive_subquery_limit;
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select @@session.expensive_subquery_limit;
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show global variables like 'expensive_subquery_limit';
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show session variables like 'expensive_subquery_limit';
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select * from information_schema.global_variables where variable_name='expensive_subquery_limit';
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select * from information_schema.session_variables where variable_name='expensive_subquery_limit';
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#
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# incorrect types
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#
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--error ER_WRONG_TYPE_FOR_VAR
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set global expensive_subquery_limit=1.1;
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--error ER_WRONG_TYPE_FOR_VAR
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set global expensive_subquery_limit=1e1;
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--error ER_WRONG_TYPE_FOR_VAR
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set global expensive_subquery_limit="foo";
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SET @@global.expensive_subquery_limit = @start_global_value;
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SELECT @@global.expensive_subquery_limit;
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