Performance Has Been Decreased After Migration.
Mar 13, 2006
Hi,
I have migrated my database from sql server 2000 to sql server 2005,
for migration i have backed up 2000 database and restored that into sql server 2005 databse.
when we are running following insert query is 50% slower in sql server 2005.
truncate table Table1
print getdate()
INSERT INTO Table1 SELECT CONVERT(INTEGER,cust_id ), store_id, MAX(Buydate), COUNT(*) FROM Table2 (NOLOCK) GROUP BY cust_id, store_id
print getdate()
How to increase the performance for the query.
Thanks in advance.
Regards
Manoj
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Mar 4, 2004
I'm trying to store files such as pdfs in my SQL Server as blobs for a particular .NET application and I'm noticing a rather large performance hit when compared to if the pdf was simply stored in the web server's file system.
I have a pdf of 7MB. If this is on a web server it takes roughly 9 seconds to download. When I store the same pdf in my database and then write it onto the page using the code below it takes roughly 40 seconds to display. Can anyone help me to improve this performance difference? Should I not be using this method to store large files?
Dim PdfCol As Integer = 0 ' the column # of the BLOB field
Dim dr As SqlDataReader = cmd.ExecuteReader()
If dr.Read() Then
Dim mypdf(dr.GetBytes(PdfCol, 0, Nothing, 0, Integer.MaxValue) - 1) As Byte
dr.GetBytes(PdfCol, 0, mypdf, 0, mypdf.Length)
End If
Response.Clear()
Response.Buffer = True
Response.ClearContent()
Response.ClearHeaders()
Response.ContentType = "application/pdf"
Response.BinaryWrite(mypdf)
Response.Flush()
Response.Close()
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Nov 22, 2007
Hi all.
Context: SQL 2000, JDBC 1.2
I have a query with 9 parameters that run as follows (approximate timing):
1. Using prepared statement: 1,7 sec
2. Re-using the same statement: 1,7 sec
3. Using prepared statement, no parameters (the params are hardcoded): 20 ms
4. Using statement+resultset+rs.getFirst: 20 ms
5. from inside SQL analyzer: instantly
So, I observe a problem when using parameters. Do I miss something, do I have to do something?
If the actual query may help, I will post it promptly.
Thx in advance
Denis
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Jan 5, 2006
Hi all,
I am wondering if anyone has similar experience.
I did the migration by detaching the database from SQL 2000 running on W2K Pro and attaching it to SQL 2005 running on XP Pro. Some queries with simple aggregate functions such as AVG() have been slowed by at least an order of magnitude. I understand that SQL server can intelligently adapt to improve the performance. I am not sure how much it can improve at this point of time.
H
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Apr 11, 2007
Hi,
I have a series of queries which have doubled in the amount of time they take to execute since moving to SQL Server 2005. The queries being performance tested are utilising hardware that is very similar to that of the comparison SQL Server 2000 server. They have 6 CPUs exactly the same and we have swapped RAM around to eliminate that difference.
There are 4 parts to the query suffering performance degredation.
1. Create temporary results table
2. Create (using SELECT INTO) and populate temporary working table 1 - 212,263 rows
3. Create (using SELECT INTO) and populate temporary working table 2 - 5,102 rows
4. Insert into temp results table matches found in temp work table 1 and temp work table 2 - 382 rows
On 2000, the queries take a total of 15 secs. On 2005, they take 30 seconds. Part four of the query takes approx 17 secs on its initial run. However, if i truncate the temp results table and re-run just the last query it only takes 1 sec. Query Plan caching?
I have reviewed the forum for a solution to the problem but with no luck. Many of the solutions presented appear to relate to permanant user tables. Solutions such as UPDATE STATISTICS and recompiling stored procedures have no positive effect. When reviewing the query plans, there are very little differences. Some expected between versions right?
The following code snippet is the query from part 4.
Code Snippet
INSERT #MatchingResults
(Table1IDNo, Table2IDNo, MatchRunNo)
SELECT DISTINCT #Table2.IDNo AS Table2IDNo,
#Table1.IDNo AS Table1IDNo,
1 AS MatchRunNo
FROM #Table1
INNER JOIN #Table2
ON ( #Table2.LastName = #Table1.LastName )
AND ( #Table2.AddressDetails = #Table1.AddressDetails )
AND ( #Table2.Country = #Table1.Country )
AND ( ( #Table2.FirstName = #Table1.FirstName) OR ( #Table1.FirstName = '' ) )
AND ( ( #Table2.Title = #Table1.Title ) OR ( #Table1.Title = '' ) )
The query plan shows a hash join on both servers. I have tried removing the distinct statement and forcing a Loop Join (query hint).
I have also run SQL Profiler. The only differences there appear to be with the "SELECT StatMan" statements.
On 2000, part of the query duration is 1719 and is as follows:
Code SnippetSELECT statman([AddressDetails],[LastName],[FirstName],[Title],[Country],@PSTATMAN)
FROM (SELECT TOP 100 PERCENT [AddressDetails],[LastName],[FirstName],[Title],[Country] FROM [dbo].[#TMCT04042007101009_________________________________________________________________________________________________000000000096] WITH(READUNCOMMITTED,SAMPLE 3.675520e+001 PERCENT) ORDER BY [AddressDetails],[LastName],[FirstName],[Title],[Country]) AS _MS_UPDSTATS_TBL OPTION (BYPASS OPTIMIZER_QUEUE, MAXDOP 1)
On 2005, part of the query duration is 5188 and is as follows:
Code Snippet
SELECT StatMan([SC0], [SB0000]) FROM (SELECT TOP 100 PERCENT [SC0], step_direction([SC0]) over (order by NULL) AS [SB0000] FROM (SELECT [AddressDetails] AS [SC0] FROM [dbo].[#TMCT04042007101009_________________________________________________________________________________________________00000000000E] WITH (READUNCOMMITTED,SAMPLE 7.946877e+001 PERCENT) ) AS _MS_UPDSTATS_TBL_HELPER ORDER BY [SC0], [SB0000] ) AS _MS_UPDSTATS_TBL OPTION (MAXDOP 1)
Its clear that the sampling rate is higher. I assume this could have something to do with it. Can this be modified?
Thank-you for your help in advance..
Cheers
Tim
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Jun 23, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server with aparticular query. It would take approximately 22 seconds to return 100rows, thats about 0.22 seconds per row. Note: I ran the query in singleuser mode. So I tested the query on the Development server by taking abackup (.dmp) of the database and moving it onto the dev server. I ranthe same query and found that it ran in less than a second.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue is relatedto some external hardware issue like: disk space, memory etc. Or couldit be OS software related issues, like service packs, SQL Serverconfiguations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating system related issue.Any Ideas would help me greatly!Thanks,Brian T*** Sent via Developersdex http://www.developersdex.com ***
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Jun 22, 2006
Hello Everyone,I have a very complex performance issue with our production database.Here's the scenario. We have a production webserver server and adevelopment web server. Both are running SQL Server 2000.I encounted various performance issues with the production server witha particular query. It would take approximately 22 seconds to return100 rows, thats about 0.22 seconds per row. Note: I ran the query insingle user mode. So I tested the query on the Development server bytaking a backup (.dmp) of the database and moving it onto the devserver. I ran the same query and found that it ran in less than asecond.I took a look at the query execution plan and I found that they we'rethe exact same in both cases.Then I took a look at the various index's, and again I found nodifferences in the table indices.If both databases are identical, I'm assumeing that the issue isrelated to some external hardware issue like: disk space, memory etc.Or could it be OS software related issues, like service packs, SQLServer configuations etc.Here's what I've done to rule out some obvious hardware issues on theprod server:1. Moved all extraneous files to a secondary harddrive to free up spaceon the primary harddrive. There is 55gb's of free space on the disk.2. Applied SQL Server SP4 service packs3. Defragmented the primary harddrive4. Applied all Windows Server 2003 updatesHere is the prod servers system specs:2x Intel Xeon 2.67GHZTotal Physical Memory 2GB, Available Physical Memory 815MBWindows Server 2003 SE /w SP1Here is the dev serers system specs:2x Intel Xeon 2.80GHz2GB DDR2-SDRAMWindows Server 2003 SE /w SP1I'm not sure what else to do, the query performance is an order ofmagnitude difference and I can't explain it. To me its is a hardware oroperating systemrelated issue.Any Ideas would help me greatly!Thanks,Brian T
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