Network Deployment (Distributed operating systems), v8.0 > Reference > Administrator best practices
JDBC connection pool counters
This topic defines the JDBC connection pool counters that are used to monitor the performance of JDBC data sources
Performance Monitoring Infrastructure (PMI) collects performance data for 4.0 and 5.0 JDBC data sources. For a 4.0 data source, the data source name is used. For a 5.0 data source, the JNDI name is used.The JDBC connection pool counters are used to monitor the performance of JDBC data sources. We can find the data by using the Tivoli performance viewer and looking under each application server by click application_server > JDBC connection pool.
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
Counter definitions. Use these counters to monitor the performance of JDBC data sources.
Name Key ID Description Granularity Type Level Overhead CreateCount connectionPoolModule.numCreates 1 The total number of connections created Per connection pool CountStatistic All Low CloseCount connectionPoolModule.numDestroys 2 The total number of connections closed. Per connection pool CountStatistic All Low AllocateCount connectionPoolModule.numAllocates 3 The total number of connections allocated Per connection pool CountStatistic All Low ReturnCount connectionPoolModule.numReturns 4 The total number of connections returned Per connection pool CountStatistic All Low PoolSize connectionPoolModule.poolSize 5 The size of the connection pool Per connection pool BoundedRangeStatistic All High FreePoolSize connectionPoolModule.freePoolSize 6 The number of free connections in the pool (apply to 5.0 DataSource only) Per connection pool BoundedRangeStatistic Basic High WaitingThreadCount connectionPoolModule.concurrentWaiters 7 The number of threads that are currently waiting for a connection Per connection pool RangeStatistic All High FaultCount connectionPoolModule.faults 8 The total number of faults, such as timeouts, in the connection pool Per connection pool CountStatistic All Low PercentUsed connectionPoolModule.percentUsed 9 The average percent of the pool that is in use Per connection pool RangeStatistic Basic High PercentMaxed connectionPoolModule.percentMaxed 10 The average percent of the time that all connections are in use Per connection pool RangeStatistic All High UseTime connectionPoolModule.avgUseTime 12 The average time a connection is used (apply to 5.0 DataSource only). Difference between the time at which the connection is allocated and returned. This value includes the JDBC operation time. Per connection pool TimeStatistic All Medium WaitTime connectionPoolModule.avgWaitTime 13 The average waiting time in milliseconds until a connection is granted Per connection pool TimeStatistic All Medium ManagedConnectionCount connectionPoolModule.numManagedConnections 14 The number of ManagedConnection objects in use for a particular connection pool (applies to V5.0 DataSource objects only) Per connection factory CountStatistic All Low ConnectionHandleCount connectionPoolModule.numConnectionHandles 15 The number of Connection objects in use for a particular connection pool (apply to 5.0 DataSource only) Per connection factory CountStatistic All Low PrepStmtCacheDiscardCount connectionPoolModule.prepStmtCacheDiscards 21 The total number of statements discarded by the least recently used (LRU) algorithm of the statement cache Per connection pool CountStatistic All Low JDBCTime connectionPoolModule.jdbcOperationTimer 22 The amount of time in milliseconds spent running in the JDBC driver which includes time spent in the JDBC driver, network, and database (apply to 5.0 DataSource only) Per data source TimeStatistic All Medium
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PMI data organization