Supported DDM access methods
IBM® i DDM supports these DDM access methods. DDM abbreviations for the access methods are given in parentheses.
- Combined access method (CMBACCAM)
- Combined keyed access method (CMBKEYAM)
- Combined record number access method (CMBRNBAM)
- Directory access method (DRCAM)
- Random by key access method (RNDKEYAM)
- Random by record number access method (RNDRNBAM)
- Relative by key access method (RELKEYAM)
- Relative by record number access method (RELRNBAM)
- Stream access method (STRAM)
See the following table for a summary of the access methods that IBM i DDM supports for each DDM file model. For a description of these access methods, refer to the DDM Architecture: Implementation Planner's Guide, GC21-9528.
| Term | Access method | DDM file models | |||||
|---|---|---|---|---|---|---|---|
| Sequential file | Direct file | Keyed file | Alternate index file | Stream file | Directory file | ||
| CMBACCAM | Combined access | N | T | T | N | ||
| CMBKEYAM | Combined keyed | T | T | ||||
| CMBRNBAM | Combined record number | T | T | T | N | ||
| DRCAM | Directory | T | |||||
| RELKEYAM | Relative by key | T | T | ||||
| RELRNBAM | Relative by record number | T | T | T | N | ||
| RNDKEYAM | Random by key | T | T | ||||
| RNDRNBAM | Random by record number | T | T | T | N | ||
| STRAM | Stream | T | |||||
| Note:
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