Answer / deepika

a view is like window through which we can acess the data.
it doesnot store the data,where as materialized view can
contain data also.this can be used for pre computed complex
calulations.
materialized views are called snapshots before oracle 9i

Answer / anurag arun edlabadkar

Difference Between Inline View & Materialized View?

You can use Materialized views to pre-aggregate the data
and improve the query performance. When you create a
materialized view, Oracle created a physical table to hold
data that would usually be read via a view. When you create
a materialized view, you specify the view's base query as
well as a schedule for the refreshes of its data. You can
then index the materialized view to enhance the performance
of queries against it. As a result, you can provide data to
your user in the format they need, indexed appropriately.

A View is a database object that is a logical
Representation of of a table. It is derived from a table
but has no storage of its own and often may be used in the
same manner as a table.

Answer / msb.dwh

a view is virtual or logical table it doesnot contain any
data but,m.view haveing data it also act like table m.view
mainly used for replication,computation,mentanience and
distrubuting the data these are equl to table or partation
table wich work like indexs

Answer / sarvesh

VIEW IS THE VIRTTUAL TABLE,AND WE CANOT REFRESH THE
DATA ,BUT IN MATERIALISED VIEW WE CAN REFRESH THE DATA
FREQUNENTLY,AND BY USING M.VIEW THE PERFORMANCE WILL BE
INCREASED.

Answer / bhabna

1.Basically Materialize view is used as the local copy of a
remote table.So instead of using a remote table,we use M-
View to avoid the network trafic.

2. One of the most prominent feature of M-view is "ENABLE
QUERY REWRITE" clause.It is a query optimization
technique that transforms a user query written in terms of
tables and views, to execute faster by fetching data from
materialized views. It is completely transparent to the end
user, requiring no intervention or hints in the SQL
application because the Oracle9i server will automatically
rewrite any appropriate SQL application to use the
materialized views.

Where as view doesn't contain any such type of clause

3.View doesn't contains any data where as M-View does

4.View reflects the data whenever thae base table is
updated but M-view doesn't reflect that untill it is
refreshed.

Answer / yaseen

Rowid of view and table is same
Rowid of M.view and table is different

Let’s say I have more than have record in source table and I have 3 destination table A,B,C. I have to insert first 1 to 10 records in A then 11 to 20 in B and 21 to 30 in C. Then again from 31 to 40 in A, 41 to 50 in B and 51 to 60 in C……So on up to last record.

5 Answers  

suppose my source is 101 a 1o1 b 101 c 101 d i want target like that 101 abcd how will u achive this please give me the answer

1 Answers   TCS,

How to transform normalized data to denormalized form in informatica? Is there any logic or any transformations to achieve this?

3 Answers  

How do you manage the Parameter files while migrating your data from one environment to another environment?

0 Answers  

what are the types of facts with Examples?

3 Answers  

How to implement security measures using repository manager?

0 Answers  

State the limitations where we cannot use joiner in the mapping pipeline?

0 Answers  

My Source qualifier has empno, sal. Now my mapping is like SQ(EMPNO)->AGGR->EXP->TARGET SAL ------------>TARGET ? Is this mapping valid or any issues are there if we design like this?

3 Answers   Span Systems,

What is the status code in stored procedure transformation?

0 Answers   Informatica,

How to generate sequence numbers without using the sequence generator transformation?

0 Answers   Informatica,

How to load only the first and last record of a flat file into the target?

3 Answers   Mind Tree,

difference between repository database and repository service?

0 Answers