Databases Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

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Databases Interview Questions

Questions Answers Views Company eMail

Which environment variables are absolutely critical in order to run the OUI?

2 4551

What SQL query from v$session can you run to show how many sessions are logged in as a particular user account?

3 6734

Why does Oracle not permit the use of PCTUSED with indexes?

1 3025

What would you use to improve performance on an insert statement that places millions of rows into that table?

TCS,

2 6324

What would you do with an "in-doubt" distributed transaction?

1 1951

What are the commands you'd issue to show the explain plan for "select * from dual"?

1 2284

In what script is "snap$" created? In what script is the "scott/tiger" schema created?

1 2509

If you're unsure in which script a sys or system-owned object is created, but you know it's in a script from a specific directory, what UNIX command from that directory structure can you run to find your answer?

1 3489

How would you configure your networking files to connect to a database by the name of DSS which resides in domain icallinc.com?

1 3585

You create a private database link and upon connection, fails with: ORA-2085: connects to . What is the problem? How would you go about resolving this error?

1 2052

I have my backup RMAN script called "backup_rman.sh". I am on the target database. My catalog username/password is rman/rman. My catalog db is called rman. How would you run this shell script from the o/s such that it would run as a background process?

1 7387

Explain the concept of the DUAL table.

3 6286

What are the ways tablespaces can be managed and how do they differ?

IBM,

2 6786

From the database level, how can you tell under which time zone a database is operating?

1 4430

What's the benefit of "dbms_stats" over "analyze"?

1 5769

Un-Answered Questions { Databases }

What is current version of mysql?

1057

How do I create a trace in sql server?

1102

How to remove duplicate rows from table except one?

1070

1. Tell me about your self? 2. Latest Project Introduction? 3. Difference between server jobs and parallel jobs? 4. Seq-Seq Explain its behavior and execution mode and which parallelism technique is used? 5. What is padding characters? 6. Seq-Seq, Seq-Copy-Seq which one is the best and efficient? 7. How many reject links do we have to a transformer? 8. How many reject links to join stage? 9. Difference between join and lookup? 10. How to design PX routine? 11. How can we call job in another job? 12. Difference between batch and sequencer? 13. Which Database is used? 14. What is change capture? Give briefing of that? 15. What is change Code? Explain? 16. How you call UNIX in Ds? 17. How do you call JCL in UNIX? 18. How do you pass the job status of one job to another job? Have designed any job sequencer? 19. How do you find a file in existed directory? 20. How can you call parallel jobs in transformer? 21. Execution of jobs in command line? 22. Tuning of sql queries? 23. What is orchestrating metadata? 24. What are junk dimension? 25. What are the third party tools you are used? 26. What are the system variables you have used? IBM 1. What is virtual dataset? 2. How do you handle reject link to a peek stage? 3. What is transaction table? 4. Which one is the efficient from the following? a. ODBC enterprise b. Oracle enterprise 5. How can you extract data from excel sheet? Do you know how to parameterize, this option? 6. Six pages of complex query I have, how do you simplify this query? 7. Difference between dataset and lookup file set?

1965

Is inner join faster than left join?

1265

What are wait types?

1220

What is a coalesce function?

1261

Hi am new to PLSQL & facing problems in writing code like in SP, Functions, so any one having some SP coding with in depth explanation please share with me my Email ID suvarnaatsuvarna@rediffmail.com Or taking tanning on this please do contact me

2081

Design database draw er diagram for a certain scenario ?

4635

What is sql or structured query language?

1206

This question asked during interview, 2) At the end of each month, a new table is created for each bank that contains monthly metrics consolidated at the account level. The table naming convention is bankX_YYYYMM where X represents the numeric designation of the bank and YYYYMM indicates the 4 digit year and 2 digit month. The tables contain the following fields: name data type description account text account number registered boolean indicates whether the account is registered num_trans integer number of transactions made during the time period spend numeric(9,2) total spend during the time period a) Write a SQL query that will display the total number of transactions and total spend for "Bank1" during the 4th quarter of 2009. b) Write a SQL query that will display the total number of transactions and total spend at "Bank1" and "Bank2", broken out by registered vs. non-registered accounts, during January 2010 not sure what is correct answer and how to solve?

2545

what is bcp? When does it used? : Sql dba

1040

How to select all columns of all rows from a table in oracle?

1107

Do we need to rebuild index after truncate?

1114

What versions of clipper does netlib support?

1064

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