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Oracle9i Database Reference
Release 2 (9.2)

Part Number A96536-02
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Parameter type


Default value

Derived: (1.1 * PROCESSES) + 5

Parameter class


Range of values

1 to 231

SESSIONS specifies the maximum number of sessions that can be created in the system. Because every login requires a session, this parameter effectively determines the maximum number of concurrent users in the system. You should always set this parameter explicitly to a value equivalent to your estimate of the maximum number of concurrent users, plus the number of background processes, plus approximately 10% for recursive sessions.

Oracle uses the default value of this parameter as its minimum. Values between 1 and the default do not trigger errors, but Oracle ignores them and uses the default instead.

The default values of the ENQUEUE_RESOURCES and TRANSACTIONS parameters are derived from SESSIONS. Therefore, if you increase the value of SESSIONS, you should consider whether to adjust the values of ENQUEUE_RESOURCES and TRANSACTIONS as well.

In a shared server environment, the value of PROCESSES can be quite small. Therefore, Oracle Corporation recommends that you adjust the value of SESSIONS to approximately 1.1 * total number of connections.

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