SELECT (@@GLOBAL.key_buffer_size + @@GLOBAL.query_cache_size + @@GLOBAL.tmp_table_size + @@GLOBAL.innodb_buffer_pool_size + @@GLOBAL.innodb_log_buffer_size + @@GLOBAL.max_connections*(@@GLOBAL.sort_buffer_size + @@GLOBAL.read_buffer_size + @@GLOBAL.read_rnd_buffer_size + @@GLOBAL.join_buffer_size + @@GLOBAL.thread_stack + @@GLOBAL.binlog_cache_size))/1024/1024 AS TOTAL_MEMORY_SIZE_mb
