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cc758332ba
plugins can have unused variables too. If they use a literal "Unused" string a compiler might or might not merge two identical strings into one (-fmerge-constants) and depending on that the server will or will not issue a "variable is ignored" warning.
22 lines
839 B
Plaintext
22 lines
839 B
Plaintext
SET @start_global_value = @@global.alter_algorithm;
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SELECT @@global.alter_algorithm;
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@@global.alter_algorithm
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DEFAULT
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SET GLOBAL alter_algorithm=2;
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Warnings:
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Warning 4200 The variable '@@alter_algorithm' is ignored. It only exists for compatibility with old installations and will be removed in a future release
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SELECT @@global.alter_algorithm;
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@@global.alter_algorithm
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DEFAULT
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SET GLOBAL alter_algorithm=5;
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ERROR 42000: Variable 'alter_algorithm' can't be set to the value of '5'
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SELECT @@global.alter_algorithm;
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@@global.alter_algorithm
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DEFAULT
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SET SESSION alter_algorithm=INSTANT;
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Warnings:
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Warning 4200 The variable '@@alter_algorithm' is ignored. It only exists for compatibility with old installations and will be removed in a future release
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SHOW SESSION VARIABLES LIKE 'alter_algorithm';
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Variable_name Value
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alter_algorithm DEFAULT
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