J2C connection pool counters

Use this page as a reference for properties of J2C connection pool counters.

The Java 2 Connector (J2C) connection pool counters are used to monitor J2C connection pool performance. We can find the data using the Tivoli performance viewer and clicking application_server > J2C connection pool.

Counter definitions

definitions. Use these counters to monitor J2C connection

Name	Key	Description	Version	Granularity	Type	Level	Overhead	ID
ManagedConnectionCount	j2cModule.numManagedConnections	The number of ManagedConnection objects in use	5.0	Per connection factory	CountStatistic	All	Low	14
ConnectionHandleCount	j2cModule.numConnectionHandles	The number of connections associated with ManagedConnections (physical connections) objects in this pool	5.0	Per connection factory	CountStatistic	All	Low	15
CreateCount	j2cModule.numManagedConnectionsCreated	The total number of managed connections created	5.0	Per connection factory	CountStatistic	Basic	Low	1
CloseCount	j2cModule.numManagedConnectionsDestroyed	The total number of managed connections destroyed	5.0	Per connection factory	CountStatistic	Basic	Low	2
AllocateCount	j2cModule.numManagedConnectionsAllocated	The total number of times that a managed connection is allocated to a client (the total is maintained across the pool, not per connection).	5.0	Per connection factory	CountStatistic	All	Low	3
FreedCount	j2cModule.numManagedConnectionsReleased	The total number of times that a managed connection is released back to the pool (the total is maintained across the pool, not per connection).	5.0	Per connection factory	CountStatistic	All	Low	4
FaultCount	j2cModule.faults	The number of faults, such as timeouts, in the connection pool	5.0	Per connection factory	CountStatistic	All	Low	8
FreePoolSize	j2cModule.freePoolSize	The number of free connections in the pool	5.0	Per connection factory	BoundedRangeStatistic	Basic	High	6
PoolSize	j2cModule.poolSize	Average number of managed connections in the pool.	5.0	Per connection factory	BoundedRangeStatistic	Basic	High	5
WaitingThreadCount	j2cModule.concurrentWaiters	Average number of threads concurrently waiting for a connection	5.0	Per connection factory	RangeStatistic	Basic	High	7
PercentUsed	j2cModule.percentUsed	Average percent of the pool that is in use. The value is determined by the total number of configured connections in the ConnectionPool, not the current number of connections.	5.0	Per connection factory	RangeStatistic	All	High	9
PercentMaxed	j2cModule.percentMaxed	Average percent of the time that all connections are in use	5.0	Per connection factory	RangeStatistic	All	High	10
WaitTime	j2cModule.avgWait	Average waiting time in milliseconds until a connection is granted	5.0	Per connection factory	TimeStatistic	Basic	Medium	13
UseTime	j2cModule.useTime	Average time in milliseconds that connections are in use	5.0	Per connection factory	TimeStatistic	Basic	Medium	12

In the JMS Connection Factories section of the Tivoli performance viewer all the entries with the $ sign, for example, JMS$AdviceQCF, represent managed connections to external resources for that connection pool, which for JMS$AdviceQCF would be jms/AdviceQCF. Connection pools are registered with PMI under the name, jmsConnections. The J2C component provides the Performance Monitoring Infrastructure with the details of the managed connections created for each connection pool. PMI collates this under one module with the name JMS$QCF. Entry that is seen in Tivoli performance viewer under the JMS Connection Factories section.

Related tasks

Monitor overall system health

PMI data organization

Reference topic