High memory usage specially after running group sync.
Switch is to prevent Dir Sync pro for AD Server from loading up the reports into memory.
Disable the initialization of the sync report
A configuration option can be used in the appSettings section of the config file to disable the initialization of the sync report. If disabled, a sync report will still be recorded, but it will not be initialized between syncs. The result will be that an object will show data from the last time it was processed by Directory Sync Pro for Active Directory, rather than just the most recent time it was processed. In other words, if an object is inserted during a sync, it will show in the sync report as Inserted. Assuming a second sync does not touch this object, then if the sync report is initialized, a second sync will show this object as No Change, but if the sync report is not initialized, the object will still show as Inserted.
This setting should be added to the BinaryTree.DirSync.Exchange.exe.config file.
<appSettings>
<add key="DisableSyncReportInitialization" value="true"/>
</appSettings>
Valid values are true and false. If this setting is omitted, or set to an invalid value, the value defaults to false. If set to false, the sync report will be initialized. If set to true, the sync report will not be initialized.
This information is also available in Quest product user guide in section - Additional Configuration Options
