IFX_UPDDESC environment variable

You must set the IFX_UPDDESC environment variable at execution time before you can do a DESCRIBE of an UPDATE statement.
Read syntax diagramSkip visual syntax diagramsetenvIFX_UPDDESCvalue
value
is any non-NULL value.

A NULL value (here meaning that IFX_UPDDESC is not set) disables the describe-for-update feature. Any non-NULL value enables the feature.