projection and join operations. The reconstruction rule for mixed fragmentation uses union opera-
tions and join operations of fragments. All reduction techniques that are used for horizontal, verti-
cal and derived fragmentation can be used for mixed fragmentation. These reduction techniques
are summarized below:
Removal of empty relations that can be produced by contradicting selection predicates on
horizontal fragments.
Removal of useless relations that can be produced by applying projection operations on
vertical fragments.
Removal of useless join operations that can be produced by distributing join operations ...
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