Interview Questions : Unix/Linux : Part-8

1. Display all the files in current directory sorted by size?
ls -l | grep '^-' | awk '{print $5,$9}' |sort -n|awk '{print $2}'


2. Write a command to search for the file 'map' in the current directory?
find -name map -type f

3. How to display the first 10 characters from each line of a file?
cut -c -10 filename

4. Write a command to remove the first number on all lines that start with "@"?
sed '\,^@, s/[0-9][0-9]*//' < filename

Interview Questions : DataWareHouse - Part 5

How Many different schemas or DW Models can be used in Siebel Analytics. I know Only STAR and SNOW FLAKE and any other model that can be used?
Integrated schema design is also used to define an integrated schema design we have to define the following concepts

► Fact constellation
► Act less fact table
► Onformed dimension

A: A fact constellation is the process of joining two or more fact tables

B: A fact table with out any facts is known as fact less fact table

C:A dimension which is re useful and fixed is known as conformed dimensionA dimension, which is, shared with multiple fact tables known as conformed dimension

What is an error log table in Informatica occurs and how to maintain it in mapping?
Error Log in Informatica is a one of output file created by Informatica Server while running the session for error messages. It is created in Informatica home directory.

Oracle Interview Questions - Part-4

76. What is the OPTIMAL parameter?
It is used to set the optimal length of a rollback segment.

77. What is the functionality of SYSTEM table space?
To manage the database level transactions such as modifications of the data dictionary table that record information about the free space usage.

78. How will you create multiple rollback segments in a database?
- Create a database, which implicitly creates a SYSTEM rollback segment in a SYSTEM tablespace.
- Create a second rollback segment name R0 in the SYSTEM tablespace.
- Make new rollback segment available (after shutdown, modify init.ora file and start database)
- Create other tablespaces (RBS) for rollback segments.
- Deactivate rollback segment R0 and activate the newly created rollback segments.

DataStage BASIC functions

These functions can be used in a job control routine, which is defined as part of a jobs properties and allows other jobs to be run and controlled from the first job. Some of the functions can also be used for getting status information on the current job; these are useful in active stage expressions and before- and after-stage subroutines. 


Specify the job you want to control
DSAttachJob

DataStage-Director: Unable to open DICT 'RT_LOG###'

When attempting to open a job log in Director, user gets the following error message: Error selecting from log file RT_LOG### Error was: Unable to open DICT 'RT_LOG###'. This is because the D_RT_LOG file is missing from the projects directory.

datastage4you QAnT - April2013 - 2

Click here ---> datastage4you QAnT - April2013 - 1

#14. DataStage Server – starting the server
a) DB2
su - db2inst1 -c "db2start“
b) WAS Server
/opt/IBM/WebSphere/AppServer/bin/startServer.sh server1 -user wasadmin -password PASSWORD
c) NODE
/opt/IBM/InformationServer/ASBNode/bin/NodeAgents.sh start
d) Engine
/opt/IBM/InformationServer/Server/DSEngine/bin/uv -admin -start

datastage4you QAnT - April2013 - 1

 #1. Use the Data Set Management utility, which is available in the Tools menu of the DataStage Designer or the DataStage Manager, to examine the schema, look at row counts, and delete a Parallel Data Set. You can also view the data itself.

#2. Use Sort stages instead of Remove duplicate stages. Sort stage has got more grouping options and sort indicator options.

#3. for quick checking if DS job is running on Server or not from UNIX
ps -ef | grep 'DSD.RUN'