DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 15, Problem 7PE
Explanation of Solution
Pseudocode:
Pseudocode for an iterator that implements indexed nested-loop join is as follows:
IndexedNL::open()
begin
outer.open();
inner.open();
doner := false;
if (outer.next () != false)
move tuple from outer output buffer to tr;
else
doner := true;
end
IndexedNL::close()
begin
outer.close();
inner.close();
end
boolean IndexedNL::next()
begin
while (!doner)
begin
if(inner.next(tr [JoinAttrs]) != false)
begin
move tuple from inner output buffer to ts;
compute relation of tr an ts and place it in output buffer;
return true;
end
else
if(outer...
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Chapter 15 Solutions
DATABASE SYSTEM CONCEPTS LCPO
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