Re: Hash Programming

msbrvamsi · Posted 01-21-2016 01:17 AM

Hi ,
Please can someone help me with an example for
Left , inner , full join in Hash Coding
I have very large datasets nearly 1 crore so need help .

Reagrds,
Satya.

Kurt_Bremser · Posted 01-21-2016 02:22 AM

define "crore".

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mohamed_zaki · Posted 01-21-2016 02:28 AM

Ten million

Crore

mohamed_zaki · Posted 01-21-2016 02:22 AM

Here you will find good Examples with explanation :

Merging into Hash: Some Practical Examples of Converting MERGE Statements into Hash Objects

msbrvamsi · Posted 01-21-2016 02:25 AM

Sorry it's 1 crore data please give some examples for all joins

mohamed_zaki · Posted 01-21-2016 11:21 AM

With such number you should keep in mind that, Larger data will require more memory and can impact overall system performance.

You may consider increase the HASHEXP value to maximize the efficiency of the hash object lookup. Read more here DECLARE Statement, Hash and Hash Iterator Objects . So increase it and see if you reach better performance.

Hash Programming