Saturday, November 06, 2010

Concurrent users in a instance

Calculate number of concurrent users of an existing instance
The view v$license keeps track of concurrent sessions and users.


SQL> desc v$license
Name Null? Type
----------------------------------------- -------- ----------------
SESSIONS_MAX NUMBER
SESSIONS_WARNING NUMBER
SESSIONS_CURRENT NUMBER
SESSIONS_HIGHWATER NUMBER
USERS_MAX NUMBER
CPU_COUNT_CURRENT NUMBER
CPU_CORE_COUNT_CURRENT NUMBER
CPU_SOCKET_COUNT_CURRENT NUMBER
CPU_COUNT_HIGHWATER NUMBER
CPU_CORE_COUNT_HIGHWATER NUMBER
CPU_SOCKET_COUNT_HIGHWATER NUMBER

select sessions_current from v$license;

The above query will give you the number of concurrent users right now.

You can write a small job which will capture this information every hour for a week. Once you have this data, you can take an average of this data to get the number of concurrent users.

select SESSIONS_CURRENT,SESSIONS_HIGHWATER,CPU_COUNT_CURRENT,CPU_COUNT_HIGHWATER from v$license;



Regards,
Sukhwinder Singh




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