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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 Description Granularity Type Level Overhead
CreateCount servletSessionsModule.createdSessions The number of sessions that were created Per Web application CountStatistic All Low
InvalidateCount servletSessionsModule.invalidatedSessions The number of sessions that were invalidated Per Web application CountStatistic All Low
LifeTime servletSessionsModule.sessionLifeTime The average session life time in milliseconds (time invalidated - time created) Per Web application TimeStatistic Extended Medium
ActiveCount servletSessionsModule.activeSessions The number of concurrently active sessions. A session is active if the WAS is currently processing a request that uses that session. Per Web application RangeStatistic All High
LiveCount servletSessionsModule.liveSessions The number of local sessions that are currently cached in memory. Per Web application RangeStatistic Basic High
NoRoomForNewSessionCount servletSessionsModule.noRoomForNewSession 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 The number of session objects 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 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, you can choose to serialize the replicated data. If you choose not to serialize the data, the counter is not available. Per Web application TimeStatistic Extended Medium
ExternalReadSize servletSessionsModule.externalReadSize 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 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 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 The number of requests that are 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
SessionObjectSize servletSessionsModule.serializableSessObjSize 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
TimeSinceLastActivated servletSessionsModule.timeSinceLastActivated 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 The number of sessions that are invalidated by timeout. Per Web application CountStatistic All Low
ActivateNonExistSessionCount servletSessionsModule.activateNonExistSessions 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

 

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