Preserving standard diagnostic documentation

If an error occurs, you can preserve diagnostic data that might be helpful in problem diagnosis. You can create operating procedures to preserve commonly needed diagnostic information.

About this task

Due to the interactions between address spaces, you might sometimes need to obtain a dump of associated address spaces so that you can diagnose problems. To ensure that information that is needed to diagnose the problem is available, consider the following factors when requesting dumps of data:

If you request a dump of less data, the dump process might complete more quickly and capture diagnostic data as it existed at the time of the error. Thus more control block information might be synchronized. Conversely, if you request a complete address space dump, it might contain more data areas, but data areas might have changed since the error event occurred.

Consider these recommendations when deciding which data areas to include in the dump data set:

  • If a slow-moving performance problem is being diagnosed, request a complete address space dump.
  • If Db2 is in a hard-wait situation, request a complete address space dump.
  • If you can narrow the problem to specific components, request a dump of only the pertinent address space and data areas.
  • If you cannot narrowed the problem to a specific component, request a dump of all related address spaces with minimal data for each address space.

Procedure

To collect and preserve diagnostic data, complete the following tasks.