To optimize performance, set the Oracle parameter optimizer_index_cost_adj to a value between 20 and 25. If this value is not set, the system can run exceedingly slowly, potentially blocking users from login.
Synchronized database and application server settings
Valid from Pega Version 7.1.3
Configure your database and application server to use the same time zone and character encoding to avoid conflicts.
Node description cannot match application server node name
Valid from Pega Version 6.3 SP1
A node's Short Description should not be the same value as the application server node name. If the node's Short Description is changed to be the same value as the application server node name, then the node description is automatically changed back to the original value after a system restart.
All Pega product release notes can be found on their product pages.