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MBF= |
Language element: | data set option |
Default: | 2 for files opened for update; 1 for files opened for input or output |
Engines: | CONCUR |
Valid as: | data set option, engine or host option |
OpenVMS specifics: | All aspects are host-specific |
Syntax | |
Details | |
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Syntax |
MBF=multibuffer-count |
Details |
A multibuffer count of 1 is adequate to process your data set sequentially. However, for random access, it is more efficient to use more than one buffer to store various parts of your file in memory. For example, to tell OpenVMS RMS to allocate five buffers for every file in a data library, use the following statement:
libname test concur '[mydir]' mbf=5;
The MBF= data set option corresponds to the FAB$B_MBF field in OpenVMS RMS or to the CONNECT MULTIBUFFER_COUNT attribute when you are using FDL. For additional details about the FAB$B_MBF field, see Guide to OpenVMS File Applications.
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