diff between OLTP and OLAP?
what TOP-DOWN and BOTTOM-UP Approach? which is best?
what are Star Schema and Snow Flake Schema?
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Answer / vijay sampoorna
oltp:
1) oltp has current and upated data
2)it is denarmalized
3)it has detailed data
4)it volatail
5) it is dynamic
OLAP:
1)it has current and histarical data
2) it is normalized
3) it has summarised data
4) it is non volatail
5) it is static
top down aproch;
first construct the enteir d.w.h then devided into data marts
Bottom down Aproch:
1)first build datamarts
2) then we build data where houses
star schema:
one fact table sorunded by one or more demintaion tables is calld star schema
it is use less memory
it performence is fast
it contain data duplicates
Snow-flake Schema:
one fact table soround by one or more demintion table that tables can splited into n dimentinos
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Answer / 8686865797
OLTP databases are highly Normalized relational databases & OLAP databases are highly De normalized.
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source 1123445 I WANT OUTPUT AS DUPLICATES TO TARGET1 LIKE TARGET1 1144 NON-DUPLICATES TO TARGET2 TARGET2 235
Describe the main features of datastage?
i having source like emptable,dept table and combined purpose using for the join stage but join stage which partition techq will be prefored? pls given the ans?
AGGREGATOR default datatype
How many jobs in ur project? Explain any complex job u have done in ur project?
how do u capture duplicates through sort & transformer
What is difference between join, merge and lookup stage?
Can anybody tell me in detail any complex datastage job? I have worked only in direct load and full refresh jobs.But in all interviews this question arises
If we take 2 tables(like emp and dept),we use join stage and how to improve the performance?
i have source like deptno,sal 1,2000 2,3000 3,4000 1,2300 4,5000 5,1100 i want target like target1 deptno,sal 1,2000 3,4000 4,5000 target2 2,3000 1,2300 5,1100 with out using transformerstage
what is snow flack schema?
What are data elements?