Built within the APPDS facility are various statistics and timing measures which can be view via the CLIB Peeker D22.
The following is a list of information collected per application across the APPDS facility as a whole:

For all READ, WRITE and DELETE calls Total calls made per APPDS routine For each access mode (Sequential, Index, Key) Success count Failure count Shortest access time Longest access time Access time for last call Return status for last call Total number of errors Last error code Name of the table where the last error occurred Last operation to report an error Access mode of the operation that reported an error List of open tables

The following information is collected for each open table:

For each access mode (Sequential, Index, Key) Total Call count Failure count Shortest access time Longest access time Access time for last call Return status for last call Last operation to produce an error

APPDS Introduction Document