Hash Algorithm

Former Member — Thu, 09 Aug 2007 12:05:48 GMT

Hi Experts,

Pls explain Hash Algorithm with one example

Thanks In Advance,

Ur's

Harsha.

Re: Hash Algorithm

sukhbold_altanbat — Thu, 09 Aug 2007 12:48:02 GMT

Hi Harsha,

check these out (general information):

<a href="http://en.wikipedia.org/wiki/Hash_function">Hash function</a>

<a href="http://en.wikipedia.org/wiki/Hash_table">Hash table</a>

Regards,

Sukhee

Re: Hash Algorithm

Former Member — Thu, 09 Aug 2007 12:54:15 GMT

if you want a internal table which allows faster reading then you should go for hashed table , but the disadvantage is that you cannot use index to read the hashed itab.

you have to use keys.

sample declratin of hashed table.

data:cc_text TYPE HASHED TABLE OF /bi0/tcostcenter WITH UNIQUE KEY co_area costcenter langu .

to read entries from the hashed table.

READ TABLE cc_text INTO wa_cc_text WITH KEY

co_area = coarea

costcenter = cctr

langu = sy-langu .

Hash table access time dosent increase based on the number of records, its constant.

check out the ABAP key work documentation for different types of internal table and their usages.

> How Hash Algorithm and Logarithmic Algorithm works

> to fetch the data ?

Fetching part is the same as standard internal table, only when you work with the internal table, than it's different.

> What the basic things we have to keep in mined when

> we select the Internal table ?

Eg Performance.

> Any rule for selecting the internal table which

> should be followed ?

Standard table is quite easy to use, but you might loose performance with it. Most of the time hash table is the fastest.

Using standard table and sort it is a good choice, when you access in READ TABLE via BINARY SEARCH.

Check 'ABAP for Power Users' SAP tutorial in SDN, it very good explains this topic in detail.

http://www.sap.info/public/en/category.php4/Category-28943c61b1e60d84b/page/0/article/Article-11988425e684a338ff/en

Regards,

Pavan

Re: Hash Algorithm

VijayaDeepthi — Tue, 24 Sep 2019 06:34:09 GMT

these links are not opened it's showing Error.

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