IMS catalog data set groups
The IMS catalog database segment types are organized into four data set groups, A - D.
This information is provided to help you configure your IMS system for better catalog performance. Segment types are organized into data set groups A - D based on the expected frequency of access. Data set group A contains the most frequently accessed segment types and data set group D contains the least frequently accessed segment types.
| Segment name | Data set group |
|---|---|
| HEADER | A |
| DBD | A |
| CAPXDBD | D |
| DBDRMK | D |
| DSET | D |
| DSETRMK | D |
| AREA | D |
| AREARMK | D |
| SEGM | B |
| CAPXSEGM | D |
| SEGMRMK | D |
| FLD | C |
| FLDRMK | D |
| MAR | C |
| MARRMK | D |
| PROP | C |
| LCHILD | B |
| LCHRMK | D |
| LCH2IDX | D |
| XDFLD | B |
| XDFLDRMK | D |
| MAP | B |
| MAPRMK | D |
| CASE | B |
| CASERMK | D |
| CFLD | B |
| CFLDRMK | D |
| CMAR | B |
| CMARRMK | D |
| CPROP | B |
| DBDVEND | D |
| PSB | A |
| PSBRMK | D |
| PCB | B |
| PCBRMK | D |
| SS | B |
| SSRMK | D |
| SF | B |
| SFRMK | D |
| DBDXREF | D |
| PSBVEND | D |