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# ulong session SET @start_global_value = @@global.join_cache_level; # # exists as global only # --replace_column 2 # show global variables like 'join_cache_level'; --replace_column 2 # show session variables like 'join_cache_level'; --replace_column 2 # select * from information_schema.global_variables where variable_name='join_cache_level'; --replace_column 2 # select * from information_schema.session_variables where variable_name='join_cache_level'; # # show that it's writable # set global join_cache_level=4; select @@global.join_cache_level; set session join_cache_level=4; select @@session.join_cache_level; # # incorrect types # --error ER_WRONG_TYPE_FOR_VAR set global join_cache_level=1.1; --error ER_WRONG_TYPE_FOR_VAR set session join_cache_level=1e1; --error ER_WRONG_TYPE_FOR_VAR set global join_cache_level="foo"; # # min/max values, block size # set global join_cache_level=0; select @@global.join_cache_level; set session join_cache_level=cast(-1 as unsigned int); select @@session.join_cache_level; SET @@global.join_cache_level = @start_global_value;