All Questions
24
questions
0
votes
2
answers
1k
views
Query Plan Recompiled suddenly and degrades performance
Scenario: We have a simple select query
Declare P@
SELECT TOP(1) USERID
FROM table
WHERE non_clusteredindex_column = (@P) ORDER BY PK_column DESC
It usually executes with in 0.12sec since 1 year. ...
2
votes
1
answer
902
views
Clustered index update, how changing the index only at different column value?
I've table,
example as
Id int primary key(clustered index)
Name varchar(255)not null (non-clustered index)
..
..
Other columns
I execute stored procedur as
update table1 set table1.Name=isnull(@...
- 179
3
votes
1
answer
2k
views
Table Valued Parameters with Estimated Number of Rows 1
I have been searching the internet for hours trying to figure out how to improve the performance of my query using table-valued parameters (TVP).
After hours of searching, I finally determined what ...
0
votes
1
answer
526
views
SQL Server choice wrong execution plan
When this query is executed, SQL Server chooses a wrong execution plan, why?
SELECT top 10 AccountNumber , AVERAGE
FROM [M].[dbo].[Account]
WHERE [Code] = 9201
Go
SELECT top 10 ...
-1
votes
1
answer
5k
views
Query Stuck in Suspended mode with IO_Completition as Wait Type
I am running a query in SQL Server 2008r2, it is stuck with
Task State: Suspended (Sometimes changes to Running but mostly Suspended)
Wait Type: IO_Completion.
There is another query running on ...
- 7,633
3
votes
3
answers
3k
views
How can i avoid an extra inner join to optimize this query?
Is there any way where I can avoid the inner join to get the customer firstname, and lastname from customer table and how can i optimize the execution plan?
SELECT c1.firstname, c1.lastname, t.*
FROM ...
- 1,564
4
votes
2
answers
8k
views
The Same SQL Query takes longer to run in one DB than another DB under the same server
I have a SQL database server and 2 databases under it with the same structure and data. I run the same sql query in the 2 databases, one of them takes longer while the other completes in less than 50% ...
- 41
1
vote
2
answers
3k
views
SQL Server : delay before output (a print statement) is produced
I may have a slight feeling as to what is going on, but I thought I'd ask to get confirmation, and potentially look at an alternative.
As a slight background, I've written a C# application that is ...
- 8,466
2
votes
3
answers
865
views
Select columns affect execution plan?
I have a query something like this. It has an execution plan using an index that I expect, up until the amount of data (i.e. the number of characters) returned by the SELECT goes over a boundary. At ...
- 21
2
votes
2
answers
1k
views
SQL Server 2008: execution plan depends on date parameters
I have a SQL query whose execution plan depends on the DateTime parameters that I provide. I understand that if I have a condition like:
WHERE Date > '2012-02-28' AND Date < '2012-01-01'
then ...
- 551
1
vote
2
answers
2k
views
Resetting Execution Plans
I am optimizing a query and am worried that SQL Server is caching execution plans so want to wipe them.
How do I do this?
- 32.4k
5
votes
3
answers
12k
views
Simple SQL to check if parent has any child rows or not
I show a grid with parent data and need to show icon if it has a relevant child row(s) exist. My DB is in SQL Server 2008. Let me simplify, I've the following two tables -
Order (PK : ID)
...
- 1,734
2
votes
2
answers
4k
views
SQL: actual number of rows difference [duplicate]
Possible Duplicate:
How does SQL server work out the estimated number of rows?
I was just looking through SQL Server Graphical Execution plan and I encountered the following two information:
...
- 15.3k
1
vote
1
answer
684
views
Query to result execution plan in SQL Server 2008 out of SSMS
Hi friends is there a query something like select * from [stored proc] which returns execution plan of SQL statement in XML format...I don't want to use SSMS .
- 867
2
votes
1
answer
281
views
SQL Server 2008: Execution plan contains wrong data?
Consider the following situation:
There is an xml that contains data @XmlData
The @XmlData is extracted into a relational table (@ItemList)
A table variable is defined (@Table)
The data extracted ...
- 2,498