Hi Nikhil,

The DSS setting you are referring to, seem to serve a different purpose. 

• Rows from the pc_events database table according to the EventsRetentionPeriod Dynamic System Setting (the default retention period is 90 days)

Reference :

https://pdn.pega.com/sites/pdn.pega.com/files/help_v721/procomhelpmain.htm#engine/agents/eng-rules-agent-con.htm

Through an entry in the prconfig.xml file or the Dynamic System Settings, you can set this retention period. To set a retention period longer or shorter than the 30 days, add or revise the following element to your prconfig.xml file and restart the system:

<env name="usage/retentionperiod " value="nnn" />

Reference:

https://pdn.pega.com/sites/pdn.pega.com/files/help_v719/procomhelpmain.htm#howto/howto2/logusagetable.htm

related

https://pdn.pega.com/community/pega-product-support/question/increasing-retention-period-prperfstats-table

Please take a look at this support article - https://pdn.pega.com/support-articles/how-alter-retention-period-prperfstats-table-cleanup

To set the prconfig as system setting, you can follow the steps in this article - https://pdn.pega.com/how-set-prconfig-values-dynamic-system-setting-value