Database Management
Reference Manual
Introduction to Database Concepts
: Extracts
Extracts
Extracts are an extension of the multiwrite facilities.
The extra functionality offered by extracts is:
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They allow long term claims, i.e. Elements are not released on module switch.
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The issuing of data is separated from SAVEWORK.
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A partial set of changes may be issued, rather than the whole lot.
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A partial set of changes may be dropped, hence losing the changes.
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Allows variants to be tried and maintained.
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Allows a 'last back wins' when issuing from variants
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Users may have their own private work space.
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Users can use extracts to implement an approval/work cycle, i.e. the issuing of data from one extract to another could correspond to given criteria being met. Other users could then read the approved data rather than the working data.
1974 to current year.
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