Naming convention for HALDB data set names

You define a part of HALDB data set names and IMS creates the rest.

When you define a partition, you define a data set name prefix of up to 37 characters for the partition. A data set name prefix cannot be a duplicate of a data set name prefix in any other HALDB database, but it can be duplicated within a single HALDB database. Because partition IDs are unique, the suffix that IMS appends to each data set name prefix makes the data set names unique for the different partitions within a HALDB database. There is no required correlation between the partition name and the names of its data sets.

To create the lowest-level qualifier, IMS appends a 6-character suffix to the prefix to form the data set name. The first character of the IMS-supplied suffix is an alphabetic character: either A–J, L, and X, or M–V, L, and Y. The 6-character suffix is separated from the preceding data set name qualifiers by a period.

The first character of the data set name suffix matches the character that is used as the suffix in the ddname. The remaining five digits of the suffix represent the partition ID number, which is assigned by DBRC and you cannot change. For example:

• A suffix of A00001 indicates the first or only DBDS in a partition with partition ID 1
• A suffix of J00004 indicates the tenth DBDS in a partition with partition ID 4
• A suffix of L00007 indicates the ILDS in a partition with partition ID 7
• A suffix of X00011 indicates the primary index in a PHIDAM partition with partition ID 11