The Long Term Canister (LTC) is a database stored on the local disk of the Processing Server to retain completed sessions and their related search indexes for a configurable length of time.
To review information on an LTC, in the Canister Status report select the individual Canister that you wish to review from the Tealeaf CX drop-down. The following areas of the report can be reviewed to check LTC health.
Un-indexed sessions
- This value indicates the number of sessions in the LTC waiting for indexing.Total Sessions LTC
- Divide the above value by this one to identify the percentage of un-indexed sessions in the LTC. If the above percentage is elevated for a significant period of time, there may be problems with session indexing.- The
Memory In Use
and CPU Utilization statistics may provide insight into more general issues.
Reviewing the session index processing
When sessions are moved to the Long Term Canister, they are queued for indexing by the Session Indexer, which periodically polls the LTC for new sessions to index. In a typical deployment, generated indexes should be approximately the same size as the session data that they index. You can identify if there are potential problems with indexing.
- Select the Canister Status report.
- Select an individual canister.
- Review the value for
Un-indexed sessions
. - The above value needs to be compared to the number of hits being submitted per second to the canister to effectively gauge if session indexing is a bottleneck.
- The interval in which the Session Indexer checks for new sections is defined by default to be
10000
milliseconds (ten seconds). You can review this setting through TMS. - If the number of un-indexed sessions is approaching the number of sessions to be inserted on average during the interval between index checks, Session Indexing may be having a difficult time keeping up with the traffic load.
- The interval in which the Session Indexer checks for new sections is defined by default to be
- To improve session performance, you can examine configuration settings in TMS.
Storage report
You can monitor storage usage on any and all Canisters in the system. To review the storage report, navigate to System Status > Storage.
- Review session storage: For each server, the LSSN Space Used and LSSN Space Free columns indicate how space has been used and is available for storage of session data in the Canister. The percentage values may be most important.
- Review index storage: For each server, the Index Space Used and Index Space Free columns indicate how space has been used and is available for storage of indexes in the Canister. The percentage values may be most important. On average, the ratio of session data storage to index data storage is 1:1.
- Index Style has a significant impact on system storage. Select
FastRsp
to enable to index only a selection of fields in the response.