Record deactivation

If an error occurs while an application program is updating a DEDB, it is not necessary to stop the database or the area.

IMS continues to allow application programs to access that area, and it only prevents them from accessing the control interval in error. If multiple copies of the ADS exist, one copy of the data is always available. (It is unlikely that the same control interval is in error in seven copies of the ADS.) IMS automatically deactivates a record when a count of 10 errors is reached.

Record deactivation minimizes the effect of database failures and errors to the data in these ways:

• If multiple copies of an area data set are used, and an error occurs while an application program is trying to update that area, the error does not need immediate correction. Other application programs can continue to access the data in that area through other available copies of that area.
• If a copy of an area has errors, you can create a new copy from existing copies of the ADS using the DEDB Data Set Create utility. The copy with the errors can then be destroyed.