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Automated Physical Database Design and Tuning
book

Automated Physical Database Design and Tuning

by Nicolas Bruno
February 2011
Intermediate to advanced content levelIntermediate to advanced
253 pages
8h 4m
English
CRC Press
Content preview from Automated Physical Database Design and Tuning
36 Automated Physical Database Design and Tuning
belongs to group 2. In this way, a MEMO compactly represents a potentially
very large number of operator trees. Also note that the children of physical
groupExpressions also point to the most efficient groupExpression in the cor-
responding groups. For instance, groupExpression 3.8 represents a hash join
operator whose left-hand child is the second groupExpression in group 1 and
whose right-hand child is the second groupExpression in group 2.
In addition to representing operator trees, the MEMO provides basic in-
frastructure for management of groupExpression properties. There are two
kinds of properties. ...
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Publisher Resources

ISBN: 9781439815670