This section lists some special considerations which may help you increase the performance of your Natural for DL/I environment.
0 if no DL/I database is to be accessed.
Do not modify
NDLPARM parameters, unless requested by a
corresponding Natural for DL/I error message. Unused buffers are compressed by
the Natural compression algorithm.
Use the same DBID for all segment types (DDMs) of a given NDB, because
OPEN command is generated for each DBID.
Keep global and local data areas as small as possible, because the format buffer contains all fields of the global and local data areas, not only those which are referenced by a Natural I/O statement.
If the sequence field is unique, use a
FIND (1) statement
instead of a
FIND statement to prevent an unnecessary second DL/I
Access segments on lower levels directly (by using the field sequence of the parent); that is, access ancestor segments only if their contents are required by the application program.
In such cases, UDFs of ancestor segments as well as DL/I fields of ancestor segments which are not sequence fields are not available to the application program.
Use the Natural utility
TEST DBLOG D)
to tune your application; see Logging Database Calls
(DBLOG) in the Natural Utilities