J2C connection pool counters

for properties of J2C connection pool counters.

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

Counter definitions

Name Key Description Version
ManagedConnectionCount j2cModule.numManagedConnections The number of ManagedConnection objects in use 5.0
ConnectionHandleCount j2cModule.numConnectionHandles The number of connections that are associated with ManagedConnections (physical connections) objects in this pool 5.0
CreateCount j2cModule.numManagedConnectionsCreated The total number of managed connections created 5.0
CloseCount j2cModule.numManagedConnectionsDestroyed The total number of managed connections destroyed 5.0
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
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
FaultCount j2cModule.faults The number of faults, such as timeouts, in the connection pool 5.0
FreePoolSize j2cModule.freePoolSize The number of free connections in the pool 5.0
PoolSize j2cModule.poolSize Average number of managed connections in the pool. 5.0
WaitingThreadCount j2cModule.concurrentWaiters Average number of threads concurrently waiting for a connection 5.0
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
PercentMaxed j2cModule.percentMaxed Average percent of the time that all connections are in use 5.0
WaitTime j2cModule.avgWait Average waiting time in milliseconds until a connection is granted 5.0
UseTime j2cModule.useTime Average time in milliseconds that connections are in use 5.0

Name Granularity Type Level Overhead
ManagedConnectionCount Per connection factory CountStatistic All Low
ConnectionHandleCount Per connection factory CountStatistic All Low
CreateCount Per connection factory CountStatistic Basic Low
CloseCount Per connection factory CountStatistic Basic Low
AllocateCount Per connection factory CountStatistic All Low
FreedCount Per connection factory CountStatistic All Low
FaultCount Per connection factory CountStatistic All Low
FreePoolSize Per connection factory BoundedRangeStatistic Basic High
PoolSize Per connection factory BoundedRangeStatistic Basic High
WaitingThreadCount Per connection factory RangeStatistic Basic High
PercentUsed Per connection factory RangeStatistic All High
PercentMaxed Per connection factory RangeStatistic All High
WaitTime Per connection factory TimeStatistic Basic Medium
UseTime Per connection factory TimeStatistic Basic Medium

Name	Key	Description	Version
ManagedConnectionCount	j2cModule.numManagedConnections	The number of ManagedConnection objects in use	5.0
ConnectionHandleCount	j2cModule.numConnectionHandles	The number of connections that are associated with ManagedConnections (physical connections) objects in this pool	5.0
CreateCount	j2cModule.numManagedConnectionsCreated	The total number of managed connections created	5.0
CloseCount	j2cModule.numManagedConnectionsDestroyed	The total number of managed connections destroyed	5.0
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
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
FaultCount	j2cModule.faults	The number of faults, such as timeouts, in the connection pool	5.0
FreePoolSize	j2cModule.freePoolSize	The number of free connections in the pool	5.0
PoolSize	j2cModule.poolSize	Average number of managed connections in the pool.	5.0
WaitingThreadCount	j2cModule.concurrentWaiters	Average number of threads concurrently waiting for a connection	5.0
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
PercentMaxed	j2cModule.percentMaxed	Average percent of the time that all connections are in use	5.0
WaitTime	j2cModule.avgWait	Average waiting time in milliseconds until a connection is granted	5.0
UseTime	j2cModule.useTime	Average time in milliseconds that connections are in use	5.0

Name	Granularity	Type	Level	Overhead
ManagedConnectionCount	Per connection factory	CountStatistic	All	Low
ConnectionHandleCount	Per connection factory	CountStatistic	All	Low
CreateCount	Per connection factory	CountStatistic	Basic	Low
CloseCount	Per connection factory	CountStatistic	Basic	Low
AllocateCount	Per connection factory	CountStatistic	All	Low
FreedCount	Per connection factory	CountStatistic	All	Low
FaultCount	Per connection factory	CountStatistic	All	Low
FreePoolSize	Per connection factory	BoundedRangeStatistic	Basic	High
PoolSize	Per connection factory	BoundedRangeStatistic	Basic	High
WaitingThreadCount	Per connection factory	RangeStatistic	Basic	High
PercentUsed	Per connection factory	RangeStatistic	All	High
PercentMaxed	Per connection factory	RangeStatistic	All	High
WaitTime	Per connection factory	TimeStatistic	Basic	Medium
UseTime	Per connection factory	TimeStatistic	Basic	Medium