6. Database Tailoring and Retrofitting Techniques › 6.3 Retrofitting Guidelines › 6.3.3 Retrofitting Archive Files

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6.3.3 Retrofitting Archive Files


There are several maintenance issues for archive files.  Data
element changes and archive reconstructions are the two major
types of maintenance discussed here.

Generally, due to the tape involvement, manipulating files in
the offline database is more cumbersome than manipulating
them in the online database.  History archive files contain
cumulative data, so applying retrofit logic amounts to
creating one new generation of the history file that contains
all cumulative data with the change applied.  Audit archives
contain "snapshot" data, normally at one week of detailed
data per generation, so applying a data element retrofit to
audit files involves rewriting all generations of a given
data set.