V$RESOURCE_LIMIT

This view displays information about global resource use for some of the system resources. Use this view to monitor the consumption of resources so that you can take corrective action, if necessary. Many of the resources correspond to initialization parameters listed in Table 3-2.

Some resources, those used by DLM for example, have an initial allocation (soft limit), and the hard limit, which is theoretically infinite (although in practice it is limited by SGA size). During SGA reservation/initialization, a place is reserved in SGA for the INITIAL_ALLOCATION of resources, but if this allocation is exceeded, additional resources are allocated up to the value indicated by LIMIT_VALUE. The CURRENT_UTILIZATION column indicates whether the initial allocation has been exceeded. When the initial allocation value is exceeded, the additional required resources are allocated from the shared pool, where they must compete for space with other resources.

A good choice for the value of INITIAL_ALLOCATION will avoid the contention for space. For most resources, the value for INITIAL_ALLOCATION is the same as the LIMIT_VALUE. Exceeding LIMIT_VALUE results in an error.

Column	Datatype	Description
RESOURCE_NAME	VARCHAR2(30)	Name of the resource (see Table 3-2)
CURRENT_UTILIZATION	NUMBER	Number of (resources, locks, or processes) currently being used
MAX_UTILIZATION	NUMBER	Maximum consumption of this resource since the last instance start-up
INITIAL_ALLOCATION	VARCHAR2(10)	Initial allocation. This will be equal to the value specified for the resource in the initialization parameter file (UNLIMITED for infinite allocation).
LIMIT_VALUE	VARCHAR2(10)	Unlimited for resources and locks. This can be greater than the initial allocation value (UNLIMITED for infinite limit).

Table 3-2  Values for RESOURCE_NAME column

Resource Name	Corresponds to this Initialization Parameter
DML_LOCKS	See "DML_LOCKS"
ENQUEUE_LOCKS	This value is computed by Oracle. Use the V$ENQUEUE_LOCK view (described on ) to obtain more information about the enqueue locks.
ENQUEUE_RESOURCES	See "ENQUEUE_RESOURCES"
LM_PROCESSES	Lock manager processes
LM_LOCKS	See "LOCAL_LISTENER"
MAX_SHARED_SERVERS	See "MAX_SHARED_SERVERS"
PARALLEL_MAX_SERVERS	See "PARALLEL_MAX_SERVERS"
PROCESSES	See "PROCESSES"
ROLLBACK_SEGMENTS	See "MAX_ROLLBACK_SEGMENTS"
SESSIONS	See "SESSIONS"
SORT_SEGMENT_LOCKS	This value is computed by Oracle
TEMPORARY_LOCKS	This value is computed by Oracle
TRANSACTIONS	See "TRANSACTIONS"