## Errors in the Execution of the SDBUPD Program

If errors occur when you execute the SDBUPD program, the program terminates with a message describing the cause of the error.

#### Frequent Causes of Errors

...

1. An unexpected error occurred when you executed SDBUPD.

2. You are attempting to use SDBUPD to switch to a software version that is lower than your current version (called a downgrade in the following). Examples of this situation:

¡ You selected the wrong software version by mistake.

¡ The upgrade of the database instance terminated with an error. You then tried to use SDBUPD to return to the original software version.

¡ The database instance upgrade was successful, however, you want to return to a lower software version for other reasons.

You cannot use SDBUPD to downgrade software. If you want to use SDBUPD, the new software must have at least a higher build number (Version Notation).

#### User Action

Proceed as follows in each case.

Case 1:

No database instances exist that refer to a higher software version.

Case 2:

Database instances exist that refer to a higher software version. You want to downgrade the software that is used exclusively by the database instance (Dependent Software).

Case 3:

Database instances exist that refer to a higher software version. You want to downgrade the software that is not used by the database instance, or whose version is not relevant for the database instance (Independent Software).