Answer / abhinaw prakash

surrogate key is used to avoid the critical column.critical
column means the column which makes the analysation or data
wrong for example assume one customer table
cust_id(p.k) cust_name amount loc
1 jones 1000 hyd
he purchase the product in hyd by 1000/- if he again
purchase by 2000/- in pune not in hyd.then we have to
create another record in that table with same cust_id but
here cust_id is having primary key so we are unable to
create a new record for suppose if u update the record u
got the wrong information as
1 jones 3000 pune
so eliminating this we are maintian the another column like
cust_no as surrogate key (unique value)and removes p.k in
cust_id.surrogate key is like an index.

Answer / vijaya

surrogate is acts as a primary key. some times we want to
maintain historical information of particular product or
anything. for eg, a product costs 20rs in the month of may
and next month it costs 25rs. in this case if we want to
maintain both records with same product_id then it cant be
possible if product_id is primary key. In this case we use
concept of surrogate key. like
skey prod_id price month
1 101 20 may
2 101 25 june

in informatica this concept is used in update strategy.

Answer / mahesh manam

The main purpose of SURROGATE KEY is:

--> If you want to store the multiple records
for example:
In one general store customer id is primary key ,
If the customer change his address or phone number .
But now our requeriment is like to store all the data along
with old


-->If you are using duplicate records with out using
SURROGATE KEY like as follows:

ID NAME LOC
1 Mahesh Chennai
1 Mahesh Hyderabad


In above case if you are work with any dimmension model it
is not support to use this table. So, we need to maintain
Primary Key in each table.

-->Surrogate key is a key in that table use as a primary
key in the table to do joininng to another

-->Surrogate is very usefull and Quickly
If you are using any huge amount of data and you need to
retrive the queries which is usefull to your bussiness

What is the difference between informatica 7.0 and 8.0?

0 Answers  

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Which will beter perform IIf or decode?

3 Answers   TCS,

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i did MBA in 2008. i got job as a Software Engineer(Informatica) in 2008 February in our college campus interviews through consultancy. my problem is when iam going interview HR people ask " YOu are MBA graduate how u get software(informatica) job". iam saying i got job in campus interviews. i have knowledge in informatica in dataware housing. is this answer correct or not. plese give me guidence

1 Answers   IBM,

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How can repository reports be accessed without sql or other transformations?

0 Answers  

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There are 2 files, Master and User. We need to compare 2 files and prepare a output log file which lists out missing Rolename for each UserName between Master and User file. Please find the sample data- MASTER.csv ---------- Org|Tmp_UsrID|ShortMark|Rolename ---|---------|----------|------------ AUS|0_ABC_PW |ABC PW |ABC Admin PW AUS|0_ABC_PW |ABC PW |MT Deny all GBR|0_EDT_SEC|CR Edit |Editor GBR|0_EDT_SEC|CR Edit |SEC MT103 GBR|0_EDT_SEC|CR Edit |AB User USER.csv -------- Org|UserName|ShortMark|Rolename ---|--------|---------|------------ AUS|charls |ABC PW |ABC Admin PW AUS|amudha |ABC PW |MT Deny all GBR|sandya |CR Edit |Editor GBR|sandya |CR Edit |SEC MT103 GBR|sandya |CR Edit |AB User GBR|sarkar |CR Edit |Editor GBR|sarkar |CR Edit |SEC MT103 Required Output file: --------------------- Org|Tmp_UsrID|UserName|Rolename |Code ---|---------|--------|------------|-------- AUS|0_ABC_PW |charls |ABC Admin PW|MATCH AUS|0_ABC_PW |charls |MT Deny all |MISSING AUS|0_ABC_PW |amudha |ABC Admin PW|MISSING AUS|0_ABC_PW |amudha |MT Deny all |MATCH GBR|0_EDT_SEC|sandya |Editor |MATCH GBR|0_EDT_SEC|sandya |SEC MT103 |MATCH GBR|0_EDT_SEC|sandya |AB User |MATCH GBR|0_EDT_SEC|sarkar |Editor |MATCH GBR|0_EDT_SEC|sarkar |SEC MT103 |MATCH GBR|0_EDT_SEC|sarkar |AB User |MISSING Both the files are mapped through Organization, Shor_mark. So, based on each Organization, Short_Mark, for each UserName from User.csv, we need to find the Matching and Missing Rolename. I am able to bring Matching records in the output. But really I don't find any concept or logic to achieve "MISSING" records which are present in Master and not in User.csv for each UserName. Please help out guys. Let me know if you need any more information. Note:- In User.csv file, there are n number of Organization, under which n number Shortmark comes which has n number of UserName.

0 Answers  

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how can we check whether a particular cache is static or dynamic?

1 Answers   InfoCepts, TCS,

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how to read data from website into informatica? plsss send answers ASAP thanks in advance.

1 Answers   DELL,

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What is up date strategy and what are the options for update strategy?

2 Answers  

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how lookup transformation is made active in new versions... When to use connected and when to use unconnected lookup and why? which is good for session performance. How to make lookup persistent and how to remove stale data from that lookup. how commit works - when we stop or abort data. Explain in both cases. What is factless fact table and have you ever used it in real time scenarios.

0 Answers   CTS,

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In a simple mapping when i use aggregate t/r with out any condition or group by, i am getting output as only last record in the table . can any one explain it please.........?

4 Answers  

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What are the steps involved in the migration from older version to newer version of Informatica Server?

0 Answers  

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What are the issues that you have faced while moving your project from the Test Environment to the Production Environment?

1 Answers  

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