The purpose of the WOB is to provide all pertinent information required when writing an entry to the cache structure. For example, the name of the entry, the data area size in terms of its number of elements, and the storage class is contained in the WOB. Indicators specify such information as whether changed data is to be written, whether a directory entry should be assigned, and whether cross-invalidate processing should be performed.

Other information that you specify in the WOB refers to registration of interest in the entry. If you do not want to register interest, set the suppress registration indicator. If you do want to register interest, then you specify a vector index. When registration is performed, if connection interest is already registered, the specified vector index replaces any previously-specified vector index for the entry. To deregister interest for a different entry, specify OLDNAME in the WOB. If both NAME and OLDNAME are specified in the WOB for an entry, are not equal, and the name replacement control indicator is set, any registered interest for the specified local cache vector index for the entry specified by OLDNAME will be deregistered prior to registering interest for the named entry.

See IXLYWOB in z/OS® MVS™ Data Areas in the z/OS Internet library.