SQL > SELECT SUM(VARIABLE_VALUE)/1024/1024 AS 'GLOBAL_MEMORY_SIZE(MB)' FROM `information_schema`.`GLOBAL_VARIABLES` WHERE VARIABLE_NAME IN ('Innodb_buffer_pool_size','Key_buffer_size','innodb_log_buffer_size','tmp_table_size');
GLOBAL_MEMORY_SIZE(MB)
------------------------
32.99609375
SQL > SELECT
( SELECT SUM(VARIABLE_VALUE) AS 'SESSION_MEMORY_PER'
FROM `information_schema`.`GLOBAL_VARIABLES` WHERE VARIABLE_NAME IN ('sort_buffer_size','read_buffer_size','read_rnd_buffer_size','join_buffer_size','thread_stack','binlog_cache_size'))
*
(SELECT VARIABLE_VALUE AS 'MAX_CONNECTIONS'
FROM `information_schema`.`GLOBAL_VARIABLES` WHERE VARIABLE_NAME ='MAX_CONNECTIONS')/1024/1024 AS 'SESSION_MEMORY_SIZE(MB)'
FROM DUAL;
SESSION_MEMORY_SIZE(MB)
-------------------------
8343.72711181641