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тАО02-15-2006 08:24 PM
тАО02-15-2006 08:24 PM
query in RDBMS
Cheers
Priya
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тАО02-15-2006 08:29 PM
тАО02-15-2006 08:29 PM
Re: query in RDBMS
Duplication is not a needy effect in DB.
--
Muthu
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тАО02-15-2006 08:30 PM
тАО02-15-2006 08:30 PM
Re: query in RDBMS
This may be helpful to you,
http://www.dba-oracle.com/art_9i_denormal.htm
-Arun
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тАО02-15-2006 08:52 PM
тАО02-15-2006 08:52 PM
Re: query in RDBMS
Additing duplicate records could be by design. Can be avoided by introducing primary key or unique key index.
Check this link as well:
http://www.orafaq.com/faqdesgn.htm
sks
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тАО02-15-2006 09:00 PM
тАО02-15-2006 09:00 PM
Re: query in RDBMS
duplication = redundancy
this is very common when building data warehouses. Since they data almost never changes, you can afford to allow duplicates that would not hinder the integrity of the data.
hope this helps!
kind regards
yogeeraj
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тАО02-15-2006 09:03 PM
тАО02-15-2006 09:03 PM
Re: query in RDBMS
below a few characteristics of data warehouses:
o hundreds of gigabytes to terabyte in size. dealing with that scale takes knowledge.
o periods of read mostly activity, with periods of short bursts of FURIOUS load, reorganisation and rebuild activity
o use of specialised features that many people have read about but fewer have used such as bitmap indexes, materialized views, star query schemas, partitioning, etc.
o use of parallel query -- similar to above.
o constantly shifting set of questions - requiring shifting sets of data, MV's, indexes, etc (most systems, once production, are relatively static. DW's -- every day is a brand new day)
To name a few. Dealing with terabytes of data is hard, takes experience. It also require lots of know-how.
hope this helps too!
kind regards
yogeeraj