Even if you make regular backups, you might need to make an additional
backup of your VSAM spheres. Here are several examples of when to make a new
backup of your VSAM sphere:
- If you change the physical characteristics of a VSAM sphere, such as the
control interval (CI) size, or the length or location of a key field.
- If you successfully recover your VSAM sphere.
- If you are using CICS® VR forward recovery logging for batch updates and
your batch job receives a 3999 condition code.