2.2 Review jumbo data sets in TurboIMAGE/XL
Key points
- With jumbo data sets, there is a one-to-many mapping between data sets and
MPE files. Each data set can be stored in several MPE files.
- There is one chunk control file for each jumbo data set (filecode -408).
This file has no user data, and is typically small. It has information
about the chunk data files, and is used for mapping record numbers to
particular files.
- There can be up to 10 chunk data files for each jumbo data set (filecode
-409). Each file is typically 4 GigaBytes, except the last one, which may
be smaller. The data format within the chunk data files is identical to the
format used in traditional data sets.
Page last updated on November 29, 1995
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