Start Level 1 Node: Persistent Staging AreaPersistent Staging AreaEnd Level 1 Node: Persistent Staging Area
   Start Level 2 Node: DB Memory ParametersDB Memory ParametersEnd Level 2 Node: DB Memory Parameters
   Start Level 2 Node: Deleting Requests from the PSADeleting Requests from the PSAEnd Level 2 Node: Deleting Requests from the PSA
   Start Level 2 Node: Previous Technology of the PSAPrevious Technology of the PSAEnd Level 2 Node: Previous Technology of the PSA
      Start Level 3 Node: Persistent Staging AreaPersistent Staging AreaEnd Level 3 Node: Persistent Staging Area
         Start Level 4 Node: Types of Data Update with PSATypes of Data Update with PSAEnd Level 4 Node: Types of Data Update with PSA
         Start Level 4 Node: Checking and Changing DataChecking and Changing DataEnd Level 4 Node: Checking and Changing Data
         Start Level 4 Node: Checking and Changing Data Using PSA-APIsChecking and Changing Data Using PSA-APIsEnd Level 4 Node: Checking and Changing Data Using PSA-APIs
         Start Level 4 Node: VersioningVersioningEnd Level 4 Node: Versioning
         Start Level 4 Node: DB Memory ParametersDB Memory ParametersEnd Level 4 Node: DB Memory Parameters
         Start Level 4 Node: Reading the PSA and Updating a Data TargetReading the PSA and Updating a Data TargetEnd Level 4 Node: Reading the PSA and Updating a Data Target