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Servlet session counters

Use this page as a reference for properties of servlet session counters.

Data counters for this category contain usage information for HTTP sessions.


Counter definitions

Name Key ID Description Granularity Type Level Overhead
CreateCount servletSessionsModule.createdSessions 1 The number of sessions that were created Per web application CountStatistic All Low
InvalidateCount servletSessionsModule.invalidatedSessions 2 The number of sessions that were invalidated Per web application CountStatistic All Low
LifeTime servletSessionsModule.sessionLifeTime 4 The average session life time in milliseconds (time invalidated - time created) Per web application TimeStatistic Extended Medium
ActiveCount servletSessionsModule.activeSessions 6 The number of concurrently active sessions. A session is active if the WebSphere Application Server is currently processing a request that uses that session. Per web application RangeStatistic All High
LiveCount servletSessionsModule.liveSessions 7 The number of local sessions that are currently cached in memory from the time at which this metric is enabled. Per web application RangeStatistic Basic High
NoRoomForNewSessionCount servletSessionsModule.noRoomForNewSession 8 Applies only to session in memory with AllowOverflow=false. The number of times that a request for a new session cannot be handled because it exceeds the maximum session count. Per web application CountStatistic Extended Low
CacheDiscardCount servletSessionsModule.cacheDiscards 9 The number of session objects that have been forced out of the cache. A least recently used (LRU) algorithm removes old entries to make room for new sessions and cache misses. Applicable only for persistent sessions. Per web application CountStatistic All Low
ExternalReadTime servletSessionsModule.externalReadTime 10 The time (milliseconds) taken in reading the session data from the persistent store. For multirow sessions, the metrics are for the attribute; for single row sessions, the metrics are for the entire session. Applicable only for persistent sessions. When using a JMS persistent store, we can choose to serialize the replicated data. If we choose not to serialize the data, the counter is not available. Per web application TimeStatistic Extended Medium
ExternalReadSize servletSessionsModule.externalReadSize 11 Size of the session data read from persistent store. Applicable only for (serialized) persistent sessions; similar to external Read Time. Per web application TimeStatistic Extended Medium
ExternalWriteTime servletSessionsModule.externalWriteTime 12 The time (milliseconds) taken to write the session data from the persistent store. Applicable only for (serialized) persistent sessions. Similar to external Read Time. Per web application TimeStatistic Extended Medium
ExternalWriteSize servletSessionsModule.externalWriteSize 13 The size of the session data written to persistent store. Applicable only for (serialized) persistent sessions. Similar to external Read Time. Per web application TimeStatistic Extended Medium
AffinityBreakCount servletSessionsModule.affinityBreaks 14 The number of requests received for sessions that were last accessed from another web application. This value can indicate failover processing or a corrupt plug-in configuration. Per web application CountStatistic All Low
TimeSinceLastActivated servletSessionsModule.timeSinceLastActivated 15 The time difference in milliseconds between previous and current access time stamps. Does not include session time out. Per web application TimeStatistic All Medium
TimeoutInvalidationCount servletSessionsModule.invalidatedViaTimeout 16 The number of sessions invalidated by timeout. Per web application CountStatistic All Low
ActivateNonExistSessionCount servletSessionsModule.activateNonExistSessions 17 The number of requests for a session that no longer exists, presumably because the session timed out. Use this counter to help determine if the timeout is too short. Per web application CountStatistic All Low
SessionObjectSize servletSessionsModule.serializableSessObjSize 18 The size in bytes of (the serializable attributes of ) in-memory sessions. Only session objects that contain at least one serializable attribute object is counted. A session can contain some attributes that are serializable and some that are not. The size in bytes is at a session level. Per web application TimeStatistic All Max

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