Answer / rayudu

One more thing is while loading the data into table
,informatica writes the data into database logs before
loading into target ,and this cant be done while loading a
flat file.

Answer / rayudu

hi,


Flat file doesn't contain any indexes or keys so it will
directly load into it. whereas in a table it will first
check for indexes and keys while loading into table so it is
slow when compared to flat file loading.



Regards,
rayudu.

Answer / joe

In case of dbases- time is consumed to make the dbase
connection for reading/writing data to the table.

Answer / rayudu

another reason is that when we load the data into table
integration service also verifies data type and will do
parsing if needed. But in case of flat file there is no need
of parsing and checking data types.

Answer / ranjan

One more answer is in general flat files are kept on the server where informatica is installed.Thats the reason flat file loading is faster.

Answer / suresh

Here the records has to pass through the database drivers and ODBC connections are required, which is a time taking process.

But where as records from flat files are copied in easier way

Answer / nidhi

To write data in table informatica server generate the insert statement for each row where as for flat file write the data row wise in file.

Answer / ankur saini er.ankur861@gmail.

Hi in case of teradata..IS have to take care of database
logs , and backup tables etc like transient journel etc
which makes it slow in case of table.

Answer / sanjay

While loading the flat file target integration service do not have to prepare insert/update/delete sql statements, also there should not be any database overhead like unique index validation or constraints checking for the target data and no auto data type conversion takes place while writing to flat file target.

Answer / manojkumar

Thanks Rayudu.

Is there any other reson why flat file load is faster than
table load.

I had an interview and even I said the same answer. But the
interviewer asked me "Is there any other reason ?" .
Interviewer didn't satisfied with this answer.

I hope there will be some other reason as well for this
question.
Anyways thanks for your reply.

Why is meant by direct and indirect loading options in sessions?

4 Answers  

How will u pas the data with out debugger?

4 Answers  

WHat all joins are there in Source Qualifier?

1 Answers  

how can we calculate fact table size?

1 Answers  

Is it necessary to maintain the primary-foreign key relation ship between the targets in informatica while loading using constarint based loading or it is required only at database level ??

1 Answers   IBM,

How many number of sessions can one group in batches?

0 Answers  

what is incremental aggregation ,with example?

2 Answers  

What is a pre-defined event and user-defined event?

0 Answers  

What is confirmed fact in dataware housing?

2 Answers   Hewitt, TCS,

Hi, In a mapping I have 3 targets and one fixed width file as source. Total 193 records are there . I connected one port in aggregator to all 3 targets. The same value need to be load into these 3 targets . It is loaded like that only but in different order. Why? The order of insertion should be same know for all 3 targets ? Then why the order is changed ? Any one please help me. Advance thanks.

3 Answers   IBM,

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,

from Source 100 rows are coming, on target there are 5 m rows which options is better to match data 1. Joiner 2 No cache 3. Static 4. Dynamic

21 Answers   Deloitte,