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Sort Merge Joins Algorithm Assignment Help


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What is Sort Merge Joins algorithm?


sort merge join
sort( a ), Sort( b );  x, y = 0
while !r.empty() && !s.empty():
if ( a[ x ] ==  b[ y ] )
output += a[ x ]
x++;  y++
elseif  ( a[ x ] < b[ y ] )
x++
else
y++


Optimized sort merge join algorithm


1) Combine join with the merge phase of sort

2) Sort R and S in M runs of size Mon disk.

3) Merge and join the tuples in one pass.



Optimized sort merge join algorithm


Optimized two pass sort merge join algorithm


1) Cost: 3b( r ) + 3b( s )

2) Memory requirement: b( r ) + b( s ) <= m power 2

    - because we merge them in one pass

    - more efficient but more strict requirement.


Example of Sort Merge Joins algorithm


S_ID
S_NAME
RATING
S_AGE
22
S_Name1
7
45
28
S_Name2
9
35
31
S_Name3
8
55
44
S_Name4
5
35
58
S_Name5
10
35


S_ID
B_ID
DAY
R_NAME
28
103
11-4-96
R_Name1
28
103
10-3-96
R_Name2
31
101
9-10-96
R_Name3
31
102
9-12-96
R_Name4
31
101
9-11-96
R_Name5
58
103
10-12-96
R_Name6


1) Cost of the sort is : A( logA )+ ( B logB ) + (A + B)

2) And the scanning of the cost is,  ( A + B ), could be ( A*B )

     - With ‘35’, ‘100’ or ‘300’ buffer pages, both can be sorted in 2 passes;

     - Total cost of the join is = 7500.



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