Preparing for Installation › Configure CA Insight DPM for Use with CA Cross-Enterprise APM › CA Insight DPM Installation Recommendations

CA Insight DPM Installation Recommendations

1. We recommend installing the optional history component. The history component lets you view past application and subsystem performance data, which is collected and stored in VSAM history files.
2. If you install the history component, consider the following recommendations:
   • To avoid needing to redefine history and copy history files, pay attention to how the file is allocated (size and secondary extents) during the installation process:
   • Verify that the file is properly sized (primary allocation) for the amount of data to be collected.

     Note: For information about working with the Online History component, see the CA Insight DPM System Reference Guide. You can find out how to adjust allocations for the Online History data sets, and use tables and formulas to estimate the proper history file size.

3. We recommend not defining history files with a secondary extents specification. When the history file is initialized, CA Insight DPM initializes the entire file. This initialization causes the data set to extend into as many extents as possible. Use secondary extents only if you cannot allocate enough space in a primary allocation.
4. Filter the history data (using the HISTORY-ACCT=FILTER SYSPARM option) when implementing history on systems that generate a high volume of accounting records. Filtering the records lets you specify which history records to keep in the history file for subsequent online viewing and which records to discard. Storing all records on a high-volume system can cause the data on the history file to wrap too quickly and generate an unnecessary CPU overhead. You can enable filtering in the HISTORY-ACCT SYSPARM option and customize the FILTERAC IQL request to generate a simple IQL WHERE clause that ignores unwanted records. We recommend using a WHERE clause similar to the following example:

   WHERE TOTAL-TIME-DB2 > .5
   

   This clause causes CA Insight DPM to store records that have an “in DB2”