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select @@global.have_profiling="1"; @@global.have_profiling="1" 0 Warnings: Warning 1287 '@@have_profiling' is deprecated and will be removed in a future release. select @@session.have_profiling; ERROR HY000: Variable 'have_profiling' is a GLOBAL variable show global variables like 'have_profiling'; Variable_name Value have_profiling # show session variables like 'have_profiling'; Variable_name Value have_profiling # select * from information_schema.global_variables where variable_name='have_profiling'; VARIABLE_NAME VARIABLE_VALUE HAVE_PROFILING # select * from information_schema.session_variables where variable_name='have_profiling'; VARIABLE_NAME VARIABLE_VALUE HAVE_PROFILING # set global have_profiling=1; ERROR HY000: Variable 'have_profiling' is a read only variable set session have_profiling=1; ERROR HY000: Variable 'have_profiling' is a read only variable