Updated February 2012

ISMROK.SBR reads the "rock" of the traditional ISAM file open under channel ch and returns the requested parameters, all of which are optional and can be specified using any numeric data types. It will be left as an exercise to the reader to determine the usage of the parameters (hint: check out ISMUTL.LIT). The three parameters added to ISMROK in A-Shell 5.1.1122 (see History) are described below.

xcall ISMROK, ch, idaalc, idaavl{, recsiz, keysiz, keypos, devdrv, idxalc, idxavl, idanxt, idxnxt, idx'lvls, idx'blk'siz, idx'type}

idx'lvls  (Num)  [out]

returns the number of levels in the IDX

idx'blk'siz  (Num)  [out]

returns the IDX block size

idx'type  (Num)  [out]

returns a bitmap field indicating the index type:

See Also

• ISMBLD.LIT

• ISMDMP.LIT

ISMBLD.SBX

History

2008 August, A-Shell 5.1.1122:  A-Shell's ISAM underwent some major surgery for improved ISAM performance, which see for an in-depth discussion of performance issues. As part of that project, ISMROK.SBR was given three new optional parameters, as described above. The old syntax was:

xcall ISMROK, ch, ida'alc, ida'avl, recsiz, keysiz, keypos, devdrv, idx'alc, idx'avl, ida'nxt, idx'nxt