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Answer:
A user defined word is a name we give to a particular data structure. Reserved keywords are words which are pre-defined by the programming language. Reserved keywords are mostly lowercase like int, long, short, float etc.
User defined words can be made up of capital letters, low case letters, digits and underscores.
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Answer:
BLOCK NESTED LOOP JOIN
WORST CASE:
=br ∗ bs + br block transfers + 2 * br seeks = (M*N*Cr)/(B-2)+|R|*|S|+P*Cw
br=no of blocks or pages containging relation r
Explanation:
The block nested loop is used to join the of relations R and S given that these following variables, we may or may not use all of them.
BLOCK NESTED LOOP JOIN
WORST CASE:
=br ∗ bs + br block transfers + 2 * br seeks = (M*N*Cr)/(B-2)+|R|*|S|+P*Cw
br=no of blocks or pages containging relation r