Setting the purge rules for a tracking service

The purge rule is the mechanism provided in Tracking Analyst for specifying how much data is removed from memory for a real-time tracking service and how often. A purge rule is defined individually for each tracking service. Generally, there are two purge rules to choose from: Purge Oldest Records and Purge All Except Latest.

Learn more about the purge rule

Steps:

1. In ArcCatalog or the Catalog window in ArcMap, expand the Tracking Connections folder in the Catalog tree.
2. Find the name of the Tracking Server connection that contains the tracking service you want to set the purge rules for. Expand the connection to display the list of tracking services available.
3. Right-click the name of the tracking service you want to change the settings for and click Properties.

   The Tracking Service Properties dialog box opens, and the General tab is active by default.
4. Check or uncheck the Auto Purge check box to set whether purging is done at all for the tracking service.

   Under most circumstances, it is advised that auto purging should be enabled.

   Caution:

   Tracking Analyst should not be left to run unattended or for extended periods of time with auto purging disabled due to the increased risk of running out of system memory and causing machine instability.
5. Click the Threshold text box and type the maximum number of records that must be stored in memory before purging takes place.
6. Click the Purge Rule drop-down arrow and choose the appropriate purge rule from the list.

   The purge rule determines which messages are deleted when the threshold is met. The two choices are Purge Oldest Records and Purge All Except Latest.

7. If you choose the Purge Oldest Records rule, click in the Percent to Purge text box and type the percentage of records to purge when the threshold is met.

   If you choose the Purge All Except Latest rule, the Percent to Purge field is unavailable because it does not apply. The Purge All Except Latest rule always purges all records except the latest record for each track.

8. Click OK to close the Tracking Service Properties dialog box and apply the changes.

The purge rules you set for your tracking service are now in effect for this tracking service.