For a multi-node system, depending on when the first user runs the load activity on the node, and what refresh rate is specified for that Declare Pages instance, the pages created on each node for this instance might not be exactly identical to each other at every second. However, because they all use the same rule definition in the system for this Declare Pages instance, the pages on each node across the system should have similar information.
So, when we are flushing/clearing a node level data page from a multi-node system, why Pega is removing instances of that data page from all nodes? How Pega is creating and deleting node level Data Page in a multi-node system?
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On a multinode system, each Java Virtual Machine instance has one copy of the node level data page. Node level pages reduce the memory footprint by storing only a single copy of the data available to all users. As my understanding It will clear the only one node data if you click on Clear Data Page.
Behavior is totally different and depends based upon data page is parameterized or non-parameterized.
Non-Parameterized Data Page: Pega is flushing data page from all nodes of a cluster.
Parameterized Data Page: Its depends selection. If we are providing parameter then Pega is clearing instance of data page from all nodes. But if we selecting "flush all" option then Pega is clearing instance of data page from that node only.