diff between OLTP and OLAP?
what TOP-DOWN and BOTTOM-UP Approach? which is best?
what are Star Schema and Snow Flake Schema?
Answers were Sorted based on User's Feedback
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
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / 8686865797
OLTP databases are highly Normalized relational databases & OLAP databases are highly De normalized.
Is This Answer Correct ? | 0 Yes | 1 No |
i have a small question for datastage, After the desinging (i.e., transformations and loading)part, what we can do?
1.What is a delta record? How you will read it? 2.What are the different types of sorting?
Display all files which have size more 3KB in given directory/folder.
Hi All , in PX Job I have passed 4 Parameters and when i run the same job in sequence i dont want to use those parameters , is this possible if yes then how
Hi friends If anybody completed datastage 8.5 certification.Could please guide me what are the topics new in 8.5 certification.
What are the types of views in datastage director?
Hi, Please tell me how to solve this scenario in datastage ? Here we have 3 columns in a table TEST CODE,ENTRY DATE and BATCH The table looks like CODE ENTRYDATE BATCH 100 100716 1 100 100716 1 100 100716 1 200 122517 2 200 122517 2 302 555555 8 302 555555 8 302 555555 8 We need to create a seqno on grouping these 3 columns. The result should be like this. CODE ENTRYDATE BATCH SEQNO 100 100716 1 1 100 100716 1 2 100 100716 1 3 200 122517 2 1 200 122517 2 2 302 555555 8 1 302 555555 8 2 302 555555 8 3
1 Answers Alpharithm Technologies,
6) my sorce d1 d2 d1 d2 d1 d3 d2 d1 my target tartget 1 d1 2 d1 3 d1 4 d1 target2 1 d2 2 d2 3 d3 Target 3 1 d3 Can any body send me answer this is argent requierment
What are the main differences you have observed between 7.x and 8.x version of datastage?
How many types of views are there in a datastage director?
Why we use surrogate key?
count number of deptno in a emp table?