Why does Merge Join needs its sources to be sorted

Hi,
Can anyone explain why Merge Join needs its sources to be sorted ?
I saw an explanation in another thread that this is the way to not load all the data to memory, but isnt the data that is about to be merged already all in memory becuase the SORT component waits for all the rows to arrive ?
Why are there no options for Full cache, Partial Cache and No Cache like in the Lookup component ?

MERGE Join is one of Join algorithms in SQL Server needs sorted inputs and efficient for large set of records.
You may refer the below(Craig
Freedman) link to understand the MERGE JOIN algorithm in details.
http://blogs.msdn.com/b/craigfr/archive/2006/08/03/merge-join.aspx
http://technet.microsoft.com/en-us/library/ms137653.aspx
Nope
This is SSIS forum and I guess poster is asking about MERGE JOIN transformation in SSIS
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

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Why does Merge Join needs its sources to be sorted

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