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SAS 9.4 Language Reference, Second Edition
book

SAS 9.4 Language Reference, Second Edition

by SAS Institute
December 2013
Intermediate to advanced content levelIntermediate to advanced
824 pages
24h 21m
English
SAS Institute
Content preview from SAS 9.4 Language Reference, Second Edition
using, and maintaining an index. The following topics provide information about
resource usage and give you some guidelines for creating indexes.
CPU Cost
Additional CPU time is necessary to create an index as well as to maintain the index
when the data file is modified. That is, for an indexed data file, when a value is added,
deleted, or modified, it must also be added, deleted, or modified in the appropriate
index(es).
When SAS uses an index to read an observation from a data file, there is also increased
CPU usage. The increased usage results from SAS using a more complicated process
than is used when SAS retrieves data sequentially. Although CPU usage is greater, you
benefit from SAS reading only those observations that meet the conditions. ...
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Publisher Resources

ISBN: 9781629590004