Improving Conversion Performance
Sep 20, 2006
I have a varchar(max) field that is on its way to a Term Lookup task, so it requires conversion to DT_NTEXT before it gets there. The conversion is taking a really, really, really long time. In my current example I have about 400 rows. Granted the length of the varchar(max) if I 'select max(len(myColumn))' is approximately 14,000,000 so I understand that I'm moving a lot of data. But I'm on a x64 machine with 4 dual core processors and watching Task Manager I can see that I'm only using 1 core out of 8. Anything I'm missing that can speed this up?
Thanks,
Frank
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Feb 19, 2007
Hi,I used SQL Server 2005 on my development machine, and whilst thismachine isn't as powerful as the live server, it does at times seem alittle slower than I would expect. So I've been wondering if there isany way for me to tune the machine so that SQL Server is better able tomake use of the resources? I am using WS2003.Short of tweaking with the actual database, which is still underdevelopment, does anyone have any tips to increase peformance?Thanks,--Dylan Parryhttp://electricfreedom.org | http://webpageworkshop.co.ukProgramming, n: A pastime similar to banging one's headagainst a wall, but with fewer opportunities for reward.
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Sep 23, 2007
I've written a small application that uses a Microsoft Sql Server 2000 Database and Here lately i've been experiencing alot of performance problems with timeouts and data just taking too long to retreive. I was wondering what could i do to help with this.
Details:
My Program i wrote simply takes windows eventlogs and uploads them into a central database in general , i have also build a small asp.net page, where users could write out queries or save them for later use. The program is hitting our servers and it grabs them remotely, inserts into sql one by one, and clears out the logs when finished, it runs one a day, and generates about 12,000 events daily. (mostly login's and logoffs). once it starts it'll take about 2 and a half hours to finish going through everything.
Database Design...
Single Table, about 3.5 million rows now, takes up about 3 gigs of harddrive space.
Column Definitions
Name, Data Type
EventEntryID INT PrimaryKey(Clustered) (Auto-Increment Identity)
Log varchar(300)
Type varchar(300)
Date smalldatetime
Source varchar(300)
Category varchar(300)
Message varchar(8000)
EventID varchar(300)
UserName varchar(300)
Computer varchar(300)I know the database design can probally use some work, but it's hard to do so now b/c of the massive amoutns of data without killing the transaction log.
Computer Specs:
OS: Window Server 2003
Processor: Intel 700 MHz
RAM: 1 GB
I know it's a small server, but this is pretty much the largest thing this server deals with
I've tried to monitor sql with perfmon and sql performance counters and I just don't see much of anything going wrong with it there, so i'm thinking the the hardware isn't an issue, but then again, i'm not very familar with sql.
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Mar 28, 2006
hello everyone,
does anyone know some tipps or articles that descripe how the sqlserver 2000 can be improved? i have an application which displays newspapers. the text of the newspapers is saved in db. performance is ok but i have performance-problems when i do a fulltext-search.
1) hardware: p4 xeon double core, 2.4 Ghz, 2 GB Ram
2) number of articles in database: ~ 255.000 Records (betwenn 10 - 400 words each)
3) the database is indexed (i am searching with "CONTAINS" and not with the "LIKE"-keyword)
4) in my query i am searching in 3 columns (title,leadtext,content)
5) results (searching for one word, stopping after 150 Results):the time to get a result from database lies between 5 to 10 Seconds (Average: 6.77 sec)!
this is the time only for getting the dataset from the sqlserver. the time of manipulating the dataset and binding it to my repeater needs about 15 milliseconds. using a sqldatareader didn't improve the performance. i got the same results.
in future the number of records will be three to five times higher than now. i am afraid that then the user has to wait half a minute to get a result of 150 search hits.
my questions:
Are you having similiar results in your applications? Are this times acceptable?
The SqlServer 2000 (professional) is installed in its default way with the default settings. Are they possiblities to modify this settings for improving performance? Where can i find info about that?
greetings and thx
Klaus
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Feb 24, 2008
Hi guys,
I'm facing a performance issue with select count(*) table_name when performing pagination to my results. My actualy query joins 4 tables with proper PK and FK contrainsts and indices applied.
select top 100 * from table1
left outer join table2 on tid=rid
left outer join table3 on tid=aid
inner join shipment on sid=sid
where datetime>=convert(datetime,'20070810 00:00:00') and datetime<=convert(datetime,'20070920 23:59:59')
The query above takes 200 ms to 600 ms to execute.
select count(*) from table1
left outer join table2 on tid=rid
left outer join table3 on tid=aid
inner join shipment on sid=sid
where datetime>=convert(datetime,'20070810 00:00:00') and datetime<=convert(datetime,'20070920 23:59:59')
The query above takes 2000ms to 4000 ms to run.
The total records that fulfill the where clause is approximately 5000 to 6000 records. I checked the execution plan but found that the server is actually utilizing the indices with operations like index scan and index seek.
Are there any other things that i can do to improve the counting of total records?
Thanks.
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Dec 5, 2007
I have a number of complex search stored procedures that use the following syntax to try to simplify the code.
WHERE @SearchParam IS NULL OR SearchCol = @SearchParam
unfortunately it appears that this is really inefficient as far as the database is concerned.
If I run the following query on the AdventureWorks database (SQL Server 2005 with SP2 and fixes up to v3054)
Code Block
SET STATISTICS IO ON
Declare @CustomerID int
SET @CustomerID = 1
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE @CustomerID IS NULL OR CustomerID = @CustomerID
SELECT SalesOrderID
FROM Sales.SalesOrderHeader
WHERE CustomerID = @CustomerID
Is see that the first select results in 45 logical reads, whereas the second results in only 2 logical reads.
Does anyone have any idea how I can get the benefit of a search procedure that does not have loads of IF blocks, or dynamic SQL without this major performance issue?
Cheers,
Justin
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Aug 15, 2007
We have a table that is 800GB. We are planning to re-build the clustered index on this table to a different filegroup. The new filegroup and files associated with it will sit on a SAN which will have a 1.5TB allocation. Does anyone have any suggestions in regards to how many files to have associated with the filegroup to provide optimal performance? Apparently we could have 3 LUNS (500gb each), so would 1 file on each LUN provide additional performance as opposed to one file on 1 LUN?
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Mar 12, 2008
i have following problem. i'v designed a package which works pretty fine but now i discovered that i have performance troubles when trying to convert timestamps. I have a generated Timestamp [DT_DBTIMESTAMP], but i transfer the data to an AS/400 where i need the timestamp in the format "2008-03-12-13.37.32.000000". so i've used a derived column component with following conversion
REPLACE(REPLACE((DT_WSTR,50)ZEITPUNKT,":",".")," ","-") + ".000000"
is there a more performant way to do this? Because this makes the whole package really slow.
thx
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Oct 24, 2005
Here's a sample SELECT statement:
SELECT T1.F3
FROM T1 INNER JOIN T2 ON T1.F4 = T2.F4
WHERE
(T1.F1 > @iNum AND T2.F1 > @iNum)
OR
( @iNum2 * (T1.F1 - T2.F1)/(T1.F2 - T2.F2) ) + (T1.F1 - ((T1.F1 - T2.F1)/(T1.F2 - T2.F2) * T1.F2) ) > @INum
As you can see, the second part of the WHERE (after the OR) is much more complicated than the part before the OR. My query would run a lot faster if it tried the first part of the OR and didn't bother with the second part if the first part was satisfied. Is there any way to do this?
Thanks!
Tyler
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May 16, 2007
Hi all,
My colleague and I are having some difficulties regarding the speed of a LIKE query on our intranet system. Please see the quote below as posted on another SQL forum (To which no one has responded yet ).
Quote: Howdy,
I've taken control of an SQL Database with an ASP front end. The CPU usage of the SQL Server process periodically jumps up to between 75-99%. I've managed to identify the ASP page that is causing it and it's a search page.
It's basically doing something like this:
SELECT JobNumber, CustomerName, CustomerAddress, CustomerPostCode
FROM Customers
WHERE CustomerName LIKE '%query%'
OR CustomerAddress LIKE '%query%'
OR CustomerPostCode LIKE '%query%'
Where query is the value the user has searched on.
The CustomerName and CustomerPostCode fields are varchar fields, but the CustomerAddress field is a text field.
I know if I replace the CustomerAddress text field with a series of varchar fields then I could make them non-clustered indexes, but would this help speed things up with a LIKE query?
There's a lot of work required on the ASP side if I'm going to split the field out, so I only want to do it if I'm gonna get a significant benefit from doing it.
Failing this, is there a better way of performing a search like this?
Any help is much appreciated,
Thanks!
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Nov 4, 2006
All:
I am presently tasked with improving the performance of a chatty application. What I mean by a chatty application is that the application makes multiple calls to the database server for each user request. In many cases it appears that many of the windows are making multiple calls to the database for the population of dialog boxes. In a couple of cases there are more than 10 dialog boxes that are populated similar to this.
To me this is kind of an "old issue", but my response is (1) cache the dialog information as much as possible and (2) make one call to the database to return all of this data for the dialog boxes if it is not cached. For update calls again make a single call to the database rather than making a call for each individual row of a table that is updated.
I admit that some of this will complicate the code of the application; however, my perspective is that I am supposed to look at this from the database perspective and not from the perspective of "programmer convenience." There will be times in which something that would otherwise get to hairy for a programmer will dictate an additional trip to the server, but this should not normally be the case.
What else do I need to consider?
Dave
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Oct 26, 2007
Does any one know of any good components I can buy in to sit on top of my SQL Server to provide the kind of search functionality that google has - 'Did you mean...,' nearset match etc. I have set up SQL Server Full Text but to build all the extra functionality will take some time and I think it will be more cost effective to buy a component in. If any one has used any could you let me know of you experinces please. CheersScott
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Feb 4, 2008
Is there a configuration or a trick to improve the speed of the access to inserted and deleted tables whithin a trigger? Whenever a trigger is called, the access to inserted or deleted constitute approximatly 95% of the execution time.
Is there a way to have access to inserted and to deleted improved other than copying the data to another table?
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Sep 12, 2004
1. Use mssql server agent service to take the schedule
2. Use a .NET windows service with timers to call SqlClientConnection
above, which way would be faster and get a better performance?
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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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Jan 7, 2008
Hi Experts,
I am extracting data from SQL Server 2005 to flat file destination. I am using SQL Command to specify the data selection query. One of my query uses Replicate function to derive a column value. When I execute this package it fails with the error "Data conversion failed. The data conversion for column "value" returned status value 4 and status text "Text was truncated or one or more characters had no match in the target code page".
The reason for the problem is that, it is taking the InputColumnWidth of the flat file destination as 8000 and I specified the OutputColumnWidth as 4.
If I change the OutputColumnWidth to 8000, it is working without any error but resulting in the column width of 8000.
I tried using DerivedColumn Transformation's Type cast and DataConversion Transformation but still I am getting the same error in the respective Transformation components.
Can anyone suggest how to solve this issue.
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Apr 12, 2000
just wondering if anyone out there has any advice or feedback regarding an upgrade conversion from 6.5 to 7.0 via the wizard? is this as straightforward as it sounds?
the only bad thing i have heard is when an upgrade is done from 6.5 to 7.0 and the 6.5 database utilized system tables . . . any feedback would be sincerely appreciated.
thank you in advance!
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Jan 15, 2007
I want to convert a table in sql server2000 to DBF .
I need to this script in sql server2000
thanks
Ahmad
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Nov 23, 1998
Anyone know how I can convert a Access97 database to SQL 6.5?
Or better yet.. how can I import a text file into SQL Server 6.5? The fields are seperated by fixed-width spaces.
thanks!
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Jul 17, 2001
Hello, I would like to convert some of the rows in a column that has a data type of int to a decimal. Should I change the data type of the whole field to decimal or numeric, it seems like no matter what I do I cannot get certain rows to come up with a decimal number even though when I run a cast or convert it gives me the correct number of rows affected when I look at the data it is still in int format. Although this seems simple I am not having any luck getting this to work. Any help would be appreciated.
Thanks
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Jun 17, 2004
Hi Techies,
We had a database MS-Access with DAO statements and we are upgrading our Database to MS-SqlServer which in need to convert the DAO statements to ADO statements.
What i want to know is there any free tool which converts automatically to convert DAO statements to ADO statements. If so what is it?
If not what is the easiest procedure to convert or otherwise should I have to do it manually convert all those DAO statements(so many). If I have to do it manually can u explain where i need to take care mainly while converting the statements.
Thank U
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May 17, 2004
Hello All,
I am in the process of converting my database's columns from char/varchar/text to nchar/nvarchar/ntext.Most of the columns have foreign keys/indexes defined on them.I need to get this done programmatically.Any scripts or help would be invaluable.
Thanks!
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Dec 20, 2006
I have a decimal property in a chart, when I tell for crystal if it will be null pass '-', since I can do
grato
Marcos S. Santos
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Feb 24, 2007
Hi!
I have a Fact_ETL process with several Lookups.
I need to compare a ID-string datatype DT_14 from OLE DB Source to string DT_18 from Dim_salesperson. Then I would collect the ID's from Dim_salesperson into OLE DB Destination. Tried to convert DT_14 to DT_18 before Lookup. No, not working. Decimal[DT_Decimal] not working either...
I would be so grateful if someone could give an idea...
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Jul 20, 2005
Hi,How do you convert DDL statements of SQL Server, which aregenerated by DTS into other database vendors' syntax (IBMDB2 or Oracle)?Any utility tool?Thank you,--jaques
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Mar 18, 2008
how can i convert 061934 to Jun 01 1934?
thanks.
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Mar 26, 2007
Hi all, i have an sdf file with me and i want to transfer the contents to an mdf file is there any way to do this with out the insert commands..can anyone throw light on this one?
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Oct 24, 2007
Hi All.
I have MS sql server 2000 database back up. Its Extension is .bkp
I want to import this file in sql express. i want to use this in sql server 2005. how can i do this, please can you write me step.
Thanks.
Zahyea.
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Nov 6, 2007
Hi,I keep getting the error:System.Data.SqlClient.SqlException: Conversion failed when converting the varchar value '@qty' to data type int. When I initiate the insert and update.I tried adding a: Convert.ToInt32(TextBox1.Text), but it didn't work.. I also tried fiddling with the update code, but I think it is to do with the insert bool as the update works at the moment.. Could someone help?My code:private bool ExecuteUpdate(int quantity){ SqlConnection con = new SqlConnection();
con.ConnectionString = "Data
Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated
Security=True;User Instance=True"; con.Open(); SqlCommand command = new SqlCommand(); command.Connection = con; TextBox TextBox1 = (TextBox)FormView1.FindControl("TextBox1"); Label labname = (Label)FormView1.FindControl("Label3"); Label labid = (Label)FormView1.FindControl("Label13"); command.CommandText = "UPDATE Items SET Quantityavailable = Quantityavailable - '@qty' WHERE productID=@productID"; command.Parameters.Add("@qty", TextBox1.Text); command.Parameters.Add("@productID", labid.Text); command.ExecuteNonQuery(); con.Close(); return true;} private bool ExecuteInsert(String quantity) { SqlConnection con = new SqlConnection();
con.ConnectionString = "Data
Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\ASPNETDB.MDF;Integrated
Security=True;User Instance=True"; con.Open(); SqlCommand command = new SqlCommand(); command.Connection = con; TextBox TextBox1 = (TextBox)FormView1.FindControl("TextBox1"); Label labname = (Label)FormView1.FindControl("Label3"); Label labid = (Label)FormView1.FindControl("Label13");
command.CommandText = "INSERT INTO Transactions
(Usersname,Itemid,itemname,Date,Qty) VALUES
(@User,@productID,@Itemsname,@date,@qty)"; command.Parameters.Add("@User", System.Web.HttpContext.Current.User.Identity.Name); command.Parameters.Add("@Itemsname", labname.Text); command.Parameters.Add("@productID", labid.Text); command.Parameters.Add("@qty", Convert.ToInt32(TextBox1.Text)); command.Parameters.Add("@date", DateTime.Now.ToString()); command.ExecuteNonQuery(); con.Close(); return true; }protected void Button2_Click(object sender, EventArgs e){ TextBox TextBox1 = FormView1.FindControl("TextBox1") as TextBox; ExecuteUpdate(Int32.Parse(TextBox1.Text) );}protected void Button2_Command(object sender, CommandEventArgs e) { if (e.CommandName == "Update") { TextBox TextBox1 = FormView1.FindControl("TextBox1") as TextBox; ExecuteInsert(TextBox1.Text); } } Thanks so much if someone can!Jon
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Nov 7, 2007
Hi does anybody know how to programmatically convert an SQL Server table into a dbf or an excel spreadsheet? I'm using C#. Also, i need to put the new table into a different folder. Thanks.
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Mar 17, 2008
Hello boyz and girlz,
Little question:
I want to write the current date and time into a database with following code:
Dim time As DateTime
time = DateTime.Now
connection.Open()
cmd.CommandText = "INSERT INTO tblOpmerkingen(Time )values('" + time + "')"
cmd.Connection = connection
But: My "time" is DD/MM/YYYY HH/mm/SS
and in my database time = MM/DD/YYYY HH/mm/SS
can somebody help me?
thanx
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Aug 17, 2004
I am getting a "Syntax error converting the varchar value '10,90' to a column of data type int." error when I run the following procedure:
@myList varchar(200)
SELECT column1
FROM table1
WHERE table1.ID IN (@myList)
When @myList is a single value, I get no errors. However, when @myList is a comma separated list like in the message above, I error out. I am using SQL Server 2000.
How else can I build this list of IDs? Thank you in advance for your comments.
--Colonel
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