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Microsoft OLE DB Provider for SQL Server error '80040e31' - Timeout expired

Hi, all,
We have a website created using ASP, it works perfect.
But sometimes we will get the error message like the following when we try to update table:

Microsoft OLE DB Provider for SQL Server error '80040e31'

Timeout expired

/Inspection/Reports/PlatformInspection/AnnualInspectionUpdateActions.asp, line 729

I must make it clear there is nothing to do with code error or connection error, it mostly works fine.

Are there some tables blocked?  How to check it? What will I do to make the website works?

Urgent!!!!!!

Thanks!

LT



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atkinsHOU
Asked:
atkinsHOU
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1 Solution
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
could you post the relevant code, and the table structure + indexes involved, please?
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atkinsHOUAuthor Commented:
Thank you Angel for your reply.
I think there is no code error, we have this website years, it works fine, I test it this mooring, it also works fine. And all the pages related to Insert clause have this error.
Do you think it is possble that some client failed some transaction and cause table be blocked?
How do I check it? restart server can solve this issue?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
I think rather that despite the application "running fine" most of the time, the problem is that the database is not "tuned" for the amount of data you have meanwhile in the database...
hence making the queries more and more slower, and eventually taker longer than the default 30 seconds of timeout.

the first thing to check now is the sql server settings: max memory, parallelism, indexes on the tables, transaction log configs, ERRORLOG config/rollover, just to name the most important...
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atkinsHOUAuthor Commented:
I open the table in database and try to run the following codes
UPDATE    tblPAssessmentReport
SET              R = '2'
WHERE     (PName = 'AAAA')

I also get the "Timeout Expired" message.
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atkinsHOUAuthor Commented:
I am using SQL Server 2005, where can I find the ERRORLOG file?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
is there an index on the field PName ?
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atkinsHOUAuthor Commented:
No
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
then, please add such an index, and try to update again, and compare then the time to run the UPDATE :)
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atkinsHOUAuthor Commented:
would you please tell me how to add an index?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
with SQL:


CREATE INDEX idx_PAssessmentReport_Pname ON tblPAssessmentReport (PName )
 
you create that index once, and the queries should then take it into account "on the fly". 

Open in new window

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atkinsHOUAuthor Commented:
Ok the index is created, what will I do to it?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
nothing. just run the UPDATE query and check out the difference the existence of the index will make to it.
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atkinsHOUAuthor Commented:
Our website works fine now, the update in all the pages work,I don't know what happen.  
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atkinsHOUAuthor Commented:
Hi, Angel, can you tell me why? is it because I create an index in one table?
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
it's the index. see:
without the index, for your update, it will have to scan the entire table
 -> it's like you had to find a certain word in a 300-page-book, without the glossary/index in the end of the book: you have to read all the pages.
 with the index, it will just scan the index (few pages), find where the word is located (on which page), and can jump directly to that page.
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atkinsHOUAuthor Commented:
But Angel, the table that I add index is not the page I update to, that make me confused.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
your UPDATE code was this:
UPDATE    tblPAssessmentReport SET              R = '2' WHERE     (PName = 'AAAA')
and the index created was for that table:
CREATE INDEX idx_PAssessmentReport_Pname ON tblPAssessmentReport (PName )

now, you might have other tables/updates without indexes, you can "repeat" the same method (just change the index, table and column names as needed).
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atkinsHOUAuthor Commented:
No, I create an index for a testing table named "tblTestTable", because I don't want to messup the current used table:
CREATE INDEX idx_tblTestTable_Pname ON tblTestTablet (PName )
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
>No, I create an index for a testing table named "tblTestTable", because I don't want to messup the current used table:
creating an index won't mess up anything on the table. it's an additional structure, side-by-side of the table.
you can safely create indexes (just not tooooo many).
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atkinsHOUAuthor Commented:
Ok, because this is the first time I create an index, so I just want to do it in a testing table, after adding the index, then I test the website, magic, it works now. So I don't know it is because the index make it work or some other reasons(for example, restart server by our network person....).
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atkinsHOUAuthor Commented:
Angel, thank you very much for your help.
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