Top 20 teradata interview questions and answers pdf ebook free download

Interview questions and answers – free pdf download Page 1 of 39
Top 20 teradata
interview questions and
answers

Job interview checklist:
- Pick out proper clothes.
- Research the company.
- Speak to past and present
employees.
- Run through questions
you may be asked.
- Practice with a friend or
family member.

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• http://jobinterview247.com/free-ebook-145-interview-
questions-and-answers
• http://jobinterview247.com/free-ebook-top-22-secrets-to-
win-every-job-interviews
• Top 7 job search, resume writing, job interview materials:
http://interviewquestions68.blogspot.com/2017/02/top-7-job-
interview-materials.html

Tell me about yourself?
This is probably the most asked
question in teradata interview. It breaks
the ice and gets you to talk about
something you should be fairly
comfortable with. Have something
prepared that doesn't sound rehearsed.
It's not about you telling your life story
and quite frankly, the interviewer just
isn't interested. Unless asked to do so,
stick to your education, career and
current situation. Work through it
chronologically from the furthest back
to the present.

What is the meaning of skewness in teradata? When do
we use nullif function in teradata?
When we choose wrong primary
index the data unevenly
distributed across all the amps
means some amps have more
records and some amps had less
records this is called skewness.
Percentage of skewness is called
skew factor.30% skew factor is
acceptable.

What Can You Do for Us That Other Candidates Can't?
What makes you unique?
This will take an
assessment of your
experiences, skills and
traits. Summarize
concisely: "I have a unique
combination of strong
technical skills, and the
ability to build strong
customer relationships.
This allows me to use my
knowledge and break down
information to be more
user-friendly."

What is fsldm in teradata ?
FSLDM - Financial Services
Logical Data Model (Teradata
FS-LDM 7.0) its developed by
Teradata for the financial sectors
(Specifically for Bank). it can be
customized based on the user
requirement.

Can we load a Multi set table using MLOAD?
We can Load SET,
MULTISET tables using
Mload, But here when loading
into MULTISET table using
MLOAD duplicate rows will
not be rejected, we have to
take care of them before
loading.But in case of Fload
when we are loading into
MULTISET duplicate rows
are automatically rejected,
FLOAD will not load
duplicate rows weather table is
SET or MULTISET

What is use of compress in teradata?Explain?
Compression is used to
Minimize the table size, for
example when the table size is
increasing anonymously We
can use Compression to reduce
the size of the table
Conditions:1.Compression can
be declared at the time of table
creation2.We can compress up
to 256 column values(not
columns) 3.We can’t compress
variable length fields
(vartext,varchar..)

Explain about Skew Factor?
The data distribution of table among
AMPs is called Skew Factor .
Generally For Non-Unique PI we get
duplicate values so the more
duplicate vales we get more the data
have same row hash so all the same
data will come to same amp, it
makes data distribution
inequality,One amp will store more
data and other amp stores less
amount of data, when we are
accessing full table, The amp which
is having more data will take longer
time and makes other amps waiting
which leads processing wastage In
this si ....

What is the difference between start schema and Fsldm?
FSLDM --> Financial Services
Logical Data Model (Teradata
FS-LDM 7.0) its developed by
Teradata for the financial sectors
(Specifically for Bank). it can be
customised based on the user
requirement.
StarSchema --> Its a relational
database schema for representing
multidimensional data. The data
is stored in a central fact table,
with one or more tables holding
information on each dimension.

What is an optimization and performance tuning and
how does it really work in practical projects?
Performance tuning and
optimization of a query involves
collecting statistics on join
columns, avoiding cross product
join, selection of appropriate
primary index (to avoid
skewness in storage) and using
secondary index. Avoiding
NUSI is advisable.

What is the difference between Global temporary tables
and Volatile temporary tables?
Global Temporary tables (GTT) –
1. When they are created, its
definition goes into Data
Dictionary.
2. When materialized data goes in
temp space.
3. That’s why, data is active upto
the session ends, and definition
will remain there up-to its not
dropped using Drop table
statement.If dropped from some
other session then its should be
Drop table all;
4. you can collect stats on GTT.

Volatile Temporary tables (VTT)
-
1. Table Definition is stored in
System cache< ....

How does indexing improve query performance?
Indexing is a way to physically
reorganize the records to enable some
frequently used queries to run faster.
The index can be used as a pointer to
the large table. It helps to locate the
required row quickly and then return it
back to the user.
or
The frequently used queries need not
hit a large table for data. they can get
what they want from the index itself. -
cover queries. Index comes with the
overhead of maintenance. Teradata
maintains its index by itself. Each time
an insert/u ....

How Teradata makes sure that there are no duplicate
rows being inserted when its a SET table?
Teradata will redirect the
new inserted row as per its
PI to the target AMP (on the
basis of its row hash value),
and if it find same row hash
value in that AMP (hash
synonyms) then it start
comparing the whole row,
and find out if duplicate. If
it’s a duplicate it silently
skips it without throwing
any error.

What is the difference between Sub-Query & Co-Related
Sub-Query?
When queries are written in a
nested manner then it is termed as a
sub-query. A Sub-Query get
executed once for the parent
statement whereas Co-Related Sub-
Query get executed once for each
row of the parent query.
Select Empname, Deptno, Salary
from Employee Emp where Salary
= (Select Max(Salary) from
Employee where Deptno =
Emp.Deptno) order by Deptno

What is the difference between Access Logging and Query
Logging in Teradata?
1. Access Logging is concerned with
security (i.e. who’s is doing what). In
access logging you ask the database to log
who’s doing what on a given object. The
information stored is based on the object
not the SQL fired or the user who fired it.
2. Query Logging (DBQL) is used for
debugging (i.e. what’s happening around
?). Incase of DBQL database keep on
tracking various parameters i.e. the SQLs,
Resource, Spool Usage, Steps and other
things which help you understand what’s
going on, the in ....

Explain TPUMP (Teradata Parallel Data Pump) Utility in
Teradata?
TPUMP allows near real time
updates from Transactional
Systems into the Data
Warehouse.
* It can perform Insert, Update
and Delete operations or a
combination from the same
source.
* It can be used as an alternative
to MLOAD for low volume
batch maintenance of large
databases.
* TPUMP allows target tables to
have Secondary Indexes, Join
Indexes, Hash Indexes,

Referential Integrity, Populated
or Empty Table, Multiset or Set
Table or Triggers defined on the
Tables.
* TPUMP can h ....

Commands used within Ferret Utility?
1. SHOWSPACE – Well this
command reports you the amount of
Disk Cylinder Space is in use and the
amount of Disk Cylinder Space is
available in the system. This will give
you an information about Permanent
Space cylinders, Spool Space
cylinders, Temporary Space cylinders,
Journaling cylinders, Bad cylinders
and Free cylinders. For each of these 5
things it will present you 3 parameters
i.e. Average Utilization per cylinder,
% of total avaliable cylinders and
number of cylinders.
2. SHOWBLOCK ....

Explain Ferret Utility in Teradata?
Ferret (File Reconfiguration
tool) is an utility which is used
to display and set Disk Space
Utilization parameters within
Teradata RDBMS. When you
select the Ferret Utility
parameters, it dynamically
reconfigures the data on disks.
We can run this utility through
Teradata Manager; to start the
Ferret Utility type (START
FERRET) in the database
window.

What is TENACITY? What is its default value?
TENACITY specifies the
amount of time in hours, to retry
to obtain a loader slot or to
establish all requested sessions to
logon. The default for Fast Load
is “no tenacity”, meaning that it
will not retry at all. If several
FastLoad jobs are executed at the
same time, we recommend
setting the TENACITY to 4,
meaning that the system will
continue trying to logon for the
number of sessions requested for
up to four hours.

What does SLEEP function does in Fast load?
The SLEEP command specifies
the amount minutes to wait
before retrying to logon and
establish all sessions. Sleep
command can be used with all
load utilities not only fastload.
This situation can occur if all of
the loader slots are used or if the
number of requested sessions is
not available. The default value
is 6 minutes. If tenacity was set
to 2 hours and sleep 10 minutes,
Sleep command will try to logon
for every 10 minutes up to 2
hours duration.

What is multi Insert?
Inserting data records into the
table using multiple insert
statements. Putting a Semi colon
in front of the key word INSERT
in the next statement rather than
Terminating the first statement
with a semi colon achieves it.
Insert into Sales “select * from
customer”
; Insert into Loan “select * from
customer”;

Top 6 tips for job
interview

Tip 1: Do your homework
You'll likely be asked difficult questions during the interview.
Preparing the list of likely questions in advance will help you easily
transition from question to question.
Spend time researching the company. Look at its site to understand
its mission statement, product offerings, and management team. A
few hours spent researching before your interview can impress the
hiring manager greatly. Read the company's annual report (often
posted on the site), review the employee's LinkedIn profiles, and
search the company on Google News, to see if they've been
mentioned in the media lately. The more you know about a
company, the more you'll know how you'll fit in to it.

Ref material: jobguide247.info/job-interview-checklist-40-points
Tip 2: First impressions
When meeting someone for the first time, we instantaneously make
our minds about various aspects of their personality.
Prepare and plan that first impression long before you walk in the
door. Continue that excellent impression in the days following, and
that job could be yours.
Therefore:
• Never arrive late.

• Use positive body language and turn on your charm right from
the start.
• Switch off your mobile before you step into the room.
• Look fabulous; dress sharp and make sure you look your best.
• Start the interview with a handshake; give a nice firm press and
then some up and down movement.
• Determine to establish a rapport with the interviewer right from
the start.
• Always let the interviewer finish speaking before giving your
response.
• Express yourself fluently with clarity and precision.
Useful material: jobguide247.info/top-10-elements-to-make-a-
good-first-impression-at-a-job-interview

Tip 3: The “Hidden” Job Market
Many of us don’t recognize that hidden job market is a huge one
and accounts for 2/3 of total job demand from enterprises. This
means that if you know how to exploit a hidden job market, you can
increase your chance of getting the job up to 300%.
In this section, the author shares his experience and useful tips to
exploit hidden job market.
Here are some sources to get penetrating into a hidden job market:
Friends; Family; Ex-coworkers; Referral; HR communities; Field

communities; Social networks such as Facebook, Twitter…; Last
recruitment ads from recruiters; HR emails of potential recruiters…
Tip 4: Do-It-Yourself Interviewing Practice
There are a number of ways to prepare for an interview at home
without the help of a professional career counselor or coach or a
fee-based service.
You can practice interviews all by yourself or recruit friends and
family to assist you.

Useful material: jobguide247.info/free-ebook-75-interview-
questions-and-answers
Tip 5: Ask questions
Do not leave the interview without ensuring that you know all that
you want to know about the position. Once the interview is over,
your chance to have important questions answered has ended.
Asking questions also can show that you are interested in the job.
Be specific with your questions. Ask about the company and the
industry. Avoid asking personal questions of the interviewer and
avoid asking questions pertaining to politics, religion and the like.

Ref material: jobguide247.info/25-questions-to-ask-employers-
during-your-job-interview
Tip 6: Follow up and send a thank-you note
Following up after an interview can help you make a lasting
impression and set you apart from the crowd.
Philip Farina, CPP, a security career expert at Manta Security
Management Recruiters, says: "Send both an email as well as a
hard-copy thank-you note, expressing excitement, qualifications
and further interest in the position. Invite the hiring manager to

contact you for additional information. This is also an excellent
time to send a strategic follow-up letter of interest."
Ref material: jobguide247.info/top-8-interview-thank-you-letter-
samples
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Top 20 teradata interview questions and answers pdf ebook free download

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Top 20 teradata interview questions and answers pdf ebook free download