Supported DDM access methods

i5/OS™ 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 i5/OS 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.

Table 1. Supported access methods for each DDM file model
Term	Access method	DDM file models
Term	Access method	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: N = Not supported T = Target DDM supported Blank = Not applicable