Hi, My understanding is that the memory utilization of mysql can be calculated roughly using the formula like: (All global memory related server variables + max_connections * session memory related server variables) As I noticed that most global variables like key_buffer_size, innodb_buffer_szie will not return back the memory to OS since they are using (mt)malloc/free, My question is: will mysql return the memory to the OS after closing some connections? Such as, when one connection executing a query which located sort buffer, and created tempory table, after complete the query or close the query, will the memory used by this query release to OS? Thanks in advance for your info.
Regards, jenny
