[Version 5.0.1 and later]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.

Note: With the instrumentation level set to anything other than MAX, the values may be less accurate for TimeStatistics and CountStatistics (and in the case of CountStatistics, such as numConnectionHandles, can even be negative). This is due to counters not being synchronized. Synchronizing counters is very expensive in terms of resources, so it is only done when the instrumentation level is set to MAX.

Counter definitions
Name Key Description Version Granularity Type Level
Num Managed Connections j2cModule.numManagedConnections The number of ManagedConnection objects in use 5.0 Per connection factory CountStatistic Low
Num Connection Handles j2cModule.numConnectionHandles The number of connections that are associated with ManagedConnections (physical connections) objects in this pool 5.0 Per connection factory CountStatistic Low
Num Connections Created j2cModule.numManagedConnectionsCreated The total number of managed connections created 5.0 Per connection factory CountStatistic Low
Num Connections Destroyed j2cModule.numManagedConnectionsDestroyed The total number of managed connections destroyed 5.0 Per connection factory CountStatistic Low
Num Connections Allocated 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 Low
Num Connections Freed 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 Low
Num Faults j2cModule.faults The number of faults, such as timeouts, in the connection pool 5.0 Per connection factory CountStatistic Low
Free Pool Size j2cModule.freePoolSize The number of free connections in the pool 5.0 Per connection factory BoundedRangeStatistic High
Pool Size j2cModule.poolSize Average number of managed connections in the pool. 5.0 Per connection factory BoundedRangeStatistic High
Concurrent Waiters j2cModule.concurrentWaiters Average number of threads concurrently waiting for a connection 5.0 Per connection factory RangeStatistic High
Percent Used j2cModule.percentUsed Average percent of the pool that is in use 5.0 Per connection factory RangeStatistic High
Percent Maxed j2cModule.percentMaxed Average percent of the time that all connections are in use 5.0 Per connection factory RangeStatistic High
Avg Wait Time j2cModule.avgWait Average waiting time in milliseconds until a connection is granted 5.0 Per connection factory TimeStatistic Medium
Avg Use Time j2cModule.useTime Average time in milliseconds that connections are in use 5.0 Per connection factory TimeStatistic Medium



Related reference
Performance data organization



Searchable topic ID:   rprf_datacounter3
Last updated: Jun 21, 2007 9:56:50 PM CDT    WebSphere Application Server for z/OS, Version 5.0.2
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