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Question
What are the steps you will take to improve performance of 
a poor performing query?
 Question Submitted By :: SQL-Server
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
No indexes, table scans, missing or out of date statistics,
blocking, excess recompilations of stored procedures,
procedures and triggers without SET NOCOUNT ON, poorly
written query with unnecessarily complicated joins, too
much normalization, excess usage of cursors and temporary
tables.


Some of the tools/ways that help you troubleshooting
performance problems are: SET SHOWPLAN_ALL ON, SET
SHOWPLAN_TEXT ON, SET STATISTICS IO ON, SQL Server
Profiler, Windows NT /2000 Performance monitor, Graphical
execution plan in Query Analyzer.

 
Is This Answer Correct ?    13 Yes 1 No
Swapna
 

 
 
 
Other SQL Server Interview Questions
 
  Question Asked @ Answers
 
PC(code, model, speed, ram, hd, cd, price) Find the hard drive sizes that are equal among two or more PCs. APX 6
Display a roll having miminum marks in two subjects? Patni 7
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Hi All, I want to display all duplicate records in the table. My query has to fetch all the records which are duplicate(First Name or Last Name). Also I want the ability to also pull names where there might be a middle initial placed in the end of the first name field, (i.e., "Maria Z. " vs. "Maria") as well. Please guide me to find this. Table: ID FirstName LastName 1 Zach H Hoffman 2 Zach Hoffman 3 Troy Hoffman 4 Shawn Livermore 5 Prem S 6 Jony Hoffman H 7 Zach Modan I need the query to filter......... ID FirstName LastName 1 Zach H Hoffman 2 Zach Hoffman 3 Troy Hoffman 6 Jony Hoffman H 7 Zach Modan I hope this example will give you clear idea..... Thanks in Advance Prem   2
How to Run a Query on a Remote SQL Server?   2
What is an index? Yardi-Software 8
how to update a null value field in sql server eg a table contains 3 fields id,name,salary and 3 records salary of 1 record is null i want update the nullfield 111 arun 300 112 ddd 200 113 ttt null i want to update table with add 100 to every record include null after updation the recrds should be 111 arun 400 112 ddd 300 113 ttt 100 HCL 6
What are mdf,ndf,ldf files and how to see the data in those files? Accenture 6
What is DAC? what is the use of it? Wipro 1
What is the system function to get the current user's user id? TCS 3
how to find number of columns in a table in sql server 2000 and 2005 also Virtusa 16
Explain the new features of SQL server 2000?   1
 
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