6. Database Tailoring and Retrofitting Techniques › 6.3 Retrofitting Guidelines

6.3 Retrofitting Guidelines

This section deals with remedial modifications to the
CA MICS database. There are several situations that may call
for such remedial measures.

Bad data may get onto the CA MICS database. This may be
caused by a user exit or logic modification not working as
intended, or may be due to an operating system or subsystem
malfunction (e.g. bad data from SMF).  Whatever the cause,
the data elements affected should be treated as soon after
the anomaly is recognized as possible.

Adding a new control data element to a file can be a
complicated procedure.  If the file already exists, salvaging
as much as possible of the previous data on the file requires
careful planning and a lot of attention to detail.

Recovering a bad archive file may be more or less
difficult, according to the type of loss of data suffered.
Generally, archives contain large amounts of data, and this
volume issue can complicate the procedure.

It is necessary to have a thorough understanding of the
material presented thus far in chapter 6 of this manual
before changing data element content.