Re: Indexing file -- BPCS-L

Just some information on EVI's:

An encoded vector index (EVI) is an index object that is used by the query
optimizer and database engine to provide fast data access in decision
support and query reporting environments. EVIs are a complementary
alternative to existing index objects (binary radix tree structure -
logical file or SQL index) and are a variation on bitmap indexing. Because
of their compact size and relative simplicity, EVIs provide for faster
scans of a table that can also be processed in parallel.

Advantages of EVIs
      Require less storage
      May have better build times
      Provide more accurate statistics to the query optimizer


Disadvantages of EVIs
      Cannot be used in ordering and grouping
      Have limited use in joins
      Some additional maintenance idiosyncrasies

From:
http://publib.boulder.ibm.com/iseries/v5r2/ic2924/index.htm?info/rzajq/rzajqmst151.htm

Regards,


Kobie Jooste
Clover Information Services
Tel: +2711 758 5387 / Mobile: +2783 798 3155 / Fax: +2711 758 5301
E-mail: kobie.jooste@xxxxxxxxxxxx
Web: www.clover.co.za





                                                                           
             "Clare Holtham"                                               
             <Clare.Holtham@bt                                             
             internet.com>                                              To 
             Sent by:                  "SSA's BPCS ERP System"             
             bpcs-l-bounces+ko         <bpcs-l@xxxxxxxxxxxx>               
             bie.jooste=clover                                          cc 
             .co.za@xxxxxxxxxx                                             
             om                                                    Subject 
                                       Re: [BPCS-L] Indexing file          
                                                                           
             2007/02/22 11:06                                              
             AM                                                            
                                                                           
                                                                           
             Please respond to                                             
              SSA's BPCS ERP                                               
                  System                                                   
             <bpcs-l@midrange.                                             
                   com>                                                    
                                                                           
                                                                           




or just STRSQL, then CREATE INDEX, specify GLH, and on the next screen
select LHDREF. Encoded Vector indexes are not usually needed.

cheers,

Clare

----- Original Message -----
From: "Kusman Lim" <kusman@xxxxxxxxxxxx>
To: "SSA's BPCS ERP System" <bpcs-l@xxxxxxxxxxxx>
Sent: Thursday, February 22, 2007 3:38 AM
Subject: [BPCS-L] Indexing file

Dear Alls

How to create index file GLH for field LHDREF on BPCS Database ? We use
iSeries, BPCS ver 6.002plf.


Thanks
Kusman LIM

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