Performance Questions
Jun 8, 2007
We have a production database that sits on a 4 proc server with 4 GB of memory and SAN disk storage via fiber. There are some stored procedures that run and they take approximately 10 minutes to run. A developer has SQL Server installed on his local pc that has 1 2.5 GHz processor and 2 GB of memory and the stored procedures run in approximately 2 minutes. I have updated statistics and rebuilt indexes to no avail. He is questioning why it runs so much faster on his smaller pc compared to the production environment. I have monitored CPU, Memory, and Disk Queue Length and none of these performance counters look concerning to me while the stored procedures are running.
Can anyone out there give me some input on what I could check to figure out why we are experiencing this performance difference?
Thanks,
Corey
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Dec 16, 2004
I have a stored procedure that takes less than 1 second in sql query analyzer to return my results.
I run this same SP in ASP.NET using a calendar control and using perf monitor I notice that for me from my dev machine my cpu utilization is sometimes over 40%.Is there any tweaks I can do to help decrease CPU utilization.
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Apr 15, 2003
We are new to SQL 2000, and would like to bounce a couple questions off some of you gurus out there.
We are using SQL Server 2000 to build a data repository to assist us in transitioning from our old flatfile legacy system to SAP. We are also looking to use the SQL Server 2000 repository to build a smallish Enterprise Data Warehouse on the same SQL 2000 platform.
Here is our problem:
We have SQL Server 2000 loaded on a little scrapper PC with 1.4GHZ single processor, 1GB of memory, and a single 40 GB IDE drive.
When we are initially loading any of our repository tables the process cruises along pretty well, even respective of trying to locate the record for update before doing an insert. But, if we do something as simple as selecting count(*) against the table that's loading, performance on the load goes to its knees.
We understand we're pretty much at the mercy of the hardware we have (that's the budget), but we'd like to get as much bang as we can out of what's there.
Our questions are:
1. Is there anything we can do with our server configuration (short of new hardware) that will help us?
2. Are there any recommendations as far as monitors to help us better tune this specific configuration?
Thanks in advance for any help.
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Apr 8, 2008
Hi,
Somebody please help me with mostly asked question on Performance Tunning Section. I have my client interview schedule for this profile.
Thanks in advance.
-- Chetan
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Feb 3, 2005
Hi all,
I have downloaded an evaluation copy of a SQL Server performance tool (a fancy version of the Profiler) called Speed Coefficient from Imceda. Pretty interesting so far, but some questions are forthcoming (and probably will continue to come as I drill down and learn more about performance thangs).
It tells me I have a recompilation that I did not expect, it says the reason is "object not found at compile time, deferred to run time", but doesn't do too well at specifically telling me which object it is complaining about (yeah, not REALLY a complaint, but perhaps more a "mention", but I digress...)
I thought originally it was, perhaps, an object that I had not referenced correctly, but as it turns out, it is, I believe, referring to a global temporary table one of my procs creates. Upon further reflection/introspection, it makes sense to me that this is the case, since it won't HAVE the temp table object to kick around until it is created at run time.
Does this make sense? If so, I guess this is one of those times where the tool just makes reference to a possible issue, but it's up to the user to understand what the underlying cause of the "mention" is, and to determine if it is "OK" to have the recompilation occur.
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Jul 20, 2005
I 'inherited' a group of SQL Server server class machines. They aretrue server technology but the disk sub-systems are lacking. There isone hot-swap backplane that all the drives share (with one SCSIchannel) thusly even though there are three logical drives (composedfrom 6 to 8 hard drives), they all go through one channel. This iscreating a performance issue that is noticable and can be seen invarious performance counters that Microsoft recommended one shouldmonitor in terms of disk I/O. For a cheaper 'fix', I can add aseperate two drive bay (with its own SCSI channel) with mirroreddrives. I would then mostly likely place the transaction log files onthis new channel. Or I could place the indices filegroup files onthis new channel for DBs with mainly searching going on (not muchupdating). If I went this route I would be leaning towards thetransaction log move since the second method would require me movingDBs around quite a bit. Any input on this solution (besides spendingmore money)?What I would prefer to do is get a better server class machine or addan external drive bay solution (not a SAN). I would try to get threeor four SCSI channels in the new hardware to split the differentfile/filegroups out (i.e. transaction logs files, data filegroup,indices filegroup, etc.). My only concern here is: would this moreexpensive solution be worth the money? As far as replacing servers, Ihave only two kinds of experience...replacing somewhat underpoweredservers with slightly less underpowered servers and replacing overkillservers with even more overkill servers. In both cases, the disksub-systems were fairly equivalent from the old system to the new one.Will going the three/four channel route really get data moving along?We have one server in particular that hosts a database (one of many onit) for a web application that gets decent traffic (it is a privatelogin based system for internal use and external use by our clients'agents). Periodically throughout the day, there are 2-5 minute burstswhere performance slows to a crawl. I want to spend more timeprofiling queries and such before recommending we spend more money,but the folks I am working for want quick results and there is quite abit of stored procedure logic to profile and investigate. I know thedisk sub-system is definately in need of an overhaul, but I would liketo get an idea of peformance gains from adding either one additionalchannel over the existing single channel as well as going thethree/four channel route over the existing single channel setup.Any information would be greatly appreciated.Regards,Tony
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May 25, 2007
Hi there,
I have been hired for a couple of weeks to investigate the performance of a sql server 2000 system.
One of the things that strikes me is that all the Primary key (identity field) fileds uses an decimal(18,0) as it's datatype.
An decimal with a precision of 18,0 takes 9 bytes for each column, while an int takes only 4 bytes and and bigint 8 bytes.
Many tables aren't that big, so the values will fit in an int datatype.
1. Is iot a good option to change the decimals columns to an int column ?
2. Many of these columns are indexed by a clustered index. Can the decimal datatype be a performance issue ?
3. sometimes they have deadlocks due page splits. Can this by reduced by changing the data types, while more data fit's into an page?
Thanks in advance,
Greetz,
Patrick de Jong
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Mar 3, 2006
1. Is it legal and OK to use a MSDN SQL copy on a production environment or is it strickly for test environments ??
2. If I own a legal copy of SQL 7 with 5 cals, can I legally use SQL MSDE and have more than 5 people access my SQL server or am I also limited to 5 users as my original ??
Sorry I am a newbie at this SQL thing.
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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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Aug 27, 1999
I have some tasks that I need to accomplish within T-SQL but cannot find
a means to accomplish them.
They are..
1. Check for the existance of an external text file.
2. Count the number of rows in an external text file.
3. Be able to run the BCP command from within T-SQL. I am currently using
the BULK INSERT command which works fine but it does not allow the following..
a. Error log for failed inserts.
b. A command output file.
Any information would be greatly appreciated.
Jim
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Sep 2, 1999
I am tying to call BCP to output the contents of a table to a text file from with in a stored procedure.
The procedure will be called from an ASP page ...
My question is were does the file get created ??? I want to create the text file on server ONE and SQL server is running on server TWO and IIS is running on server THREE... do i have to have a drive letter mapped to server ONE and if so is it mapped on the SQl server or the IIS server ....
ie:
exec master..xp_cmdshell bcp db..table out h:est.out -Uxx -Pxx -Sx
thanks for any help on this subject ...
Rob
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Aug 27, 1999
I have some tasks that I need to accomplish within T-SQL but cannot find
a means to accomplish them.
They are..
1. Check for the existance of an external text file.
2. Count the number of rows in an external text file.
3. Be able to run the BCP command from within T-SQL. I am currently using
the BULK INSERT command which works fine but it does not allow the following..
a. Error log for failed inserts.
b. A command output file.
Any information would be greatly appreciated.
Jim
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Aug 4, 1999
I have two questions,
1) Could anyone please point me in the right direction concerning information pertaining to NT Server Enterprise Edition verses NT Server Workstations. We are having problems running SQL Server 7.0 and the Enterprise Edition together on the same machine and was wanting to find information about compatability issues, if there are any,
2) I, on a SQL Server 6.5 database shrunk it by 2 Gb. When I looked to see if SQL Server released those 2 Gb back to the hard drive, I was amazed that it didn't! Did I miss something or will SQL Server 6.5 not release the space because of the initial set-up. And why did SQL Server 6.5 automatically take the space from the Transaction logs when neither of the devices were specified? Is the Transaction Log the default area for shrinkage?
Thanks in Advance!
Daimon Russell
daimon_r@hotmail.com
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Nov 5, 2007
Hi, does anyone know how to explain how SQL transactions get mapped into TDS and TDS gets mapped into TCP/IP packets?
Or can you please point me in the right direction? I need to figure out how TDS and TCP/IP relate?
We're using replication and are having some latency issues and I'm trying to find out how SQL handles TDS and TCP/IP etc...
Thanks for your time.
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Feb 7, 2002
1. When we create DTS in SQL Server through DTS designer, where are they stored physically?
2. What would be the best way to modify a DTS without using DTS designer?
3. Is there any other way to create DTS apart from DTS designer and Visual Basic?
4. Is there any website which has detailed information for DTS? (which has more FAQs like above?)
In our production environment, we keep changing the servers frequently, and everytime that happens, I have to change the connection properties in all the DTS going to them one by one.
thanks,
sanjay.
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May 4, 2001
I am not too familiar with SQL Server, but my supervisor gave me the task of finding out the difference between SQL Enterprise and SQL Standard. He also asked me to research the difference between processor licences and client access licences. I will use the Internet as a resource, but I would also like to hear the opinions of someone who uses these programs or is knowledgable about them. So please any suggestions or any useful links would be very helpful.
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Jun 17, 2004
I have two questions.
1) If a database is suspect we can have that trace from sysdatabases.There is a column named status.My question is in case of suspect datatbase what will be value in the field status of sysdatabases?
2) The password of an user login(created by using sp_addlogin stored procedure or any other way) is stored in the table sysxlogins of master database.The password is stored in a varbinary format.How can I get the actual password(means in a char format)?I mean how can I convert the varbinary value to a readable format?
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Jun 21, 2004
Hi All,
I am new in SQL SERVER 2000.I have few questions -
1) WHAT WILL I DO TO TRUNCATE THE SIZE OF A TRANSACTION LOG?
2) WHAT WILL BE THE STEPS OF BUILDING THE MASTER DATABASE?
3) WHAT WOULD BE THE PLAN OF ACTION WHEN SQL DOES NOT STARTS UP?
4) WHAT WOULD BE MY PLAN OF ACTION WHEN SQL DB GETS CORUPTED OR STARTS IN A SUSPECT MODE?
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Aug 31, 2004
Could I do periodicity backups to another computer(mediaserver) using VDI??
I mean , Could I config a Virtual Device so that I can do backups like disk or tape, I can use
'backup database ...to virtual_device='...' ' to do backup to another computer(mediaserver)?
suppose that I have finished the interface of mediaserver.
If this is impossible,how can I do periodicity backups to another computer??
I have finished a program using VDI that can do backup to another computer,and I know how to do periodicity backups to disk or tape. but I am puzzled about the periodicity backup using VDI.
How should I do?
Thanks,All.
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Sep 9, 2004
I am putting together a proposal for my church, the current DB software (Access) has been outgrown. One proponent of a no name brand software insists that to implement SQL could take a year and a team of programmers, is this true??
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Mar 15, 2004
I have to judge the aptitude of a few trainees for SQL DBA training ....
Can the gurus suggest some questions for the same ....
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Apr 9, 2008
Hi Could any one tell me the answers for these questions.
1. how do we troubleshoot a datbase if it is in suspect mode.What is the reason for a database to be in suspect mode.
2. how can we move a file from C drive to D drive, so that the file location in C drive is completely moved .
3.In a particular primary file group there are many objects.
How can we move some of the objects from this primary file group in to another file group.
4. can we install a sql server on a remote server so that it will not ask any inputs like domain name, authentication modes. .
5.If we want to implement clustering , can we use the virtual ip address on clustering as the ip address of our system or we have to use another ip address for clustering
6. In 2000 we have DTs package.can we run the same DTS package in 2005.
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Aug 21, 2006
Hi
Im relatively new to ASP/SQL and have been thrown into the deep end by work. Ive got courses to go on, but not for another 3-6months.
Ive got an ASP file calling a database using SQL. Once you hit the "go" button, it puts this data into an Excel file, under a new window (still showing the asp file in the address bar).
It currently shows:
1)
Item numbers that end in "0" i.e. 3.10, 12.20 appear as 3.1 and 12.2 respectively in the Bill of Materials … i.e. being treated as decimals … I need them to show-up as text.
************************************************** *******************
2)
When saving the spreadsheet … it would be good to get "X" to set the default file name to:
<Quote ID>_<Customer>_<Platform>_<version>.[xls|pdf]
************************************************** *******************
3)
When a spreadsheet is displayed, it is in an editable Excel format.
Is it possible to lock the file automatically when its opened or password protect it?
************************************************** *******************
4)
If a spreadsheet window is open and you try and open a new one, the old one pops-up/is still there. Need to be able to close the old one and re-open a new one automatically.
If necessary i will post the code.
Any takers?
Thanks
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Oct 3, 2007
Hello,
I need help with a few sql questions, but you need to look at picture containing the tables and the relationships between them. How do I post or upload the picture first?
Thanks.
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Jul 20, 2005
Hi all,I'd like to know if it's possible to sort twice in a same SQL query.I use SQL for retrieving Data into an Excel Spreadsheet.(Excel 2000 or XP) and to paste the queries results into an Excelspreadsheet.1. I tried to sort by date and the only way was to use the serail numberinstead of the litteral nameI tried SELECT * FROM [Sheet1$] Where [Date] <= 07/20/2003"but this does not work.I then tried SELECT * FROM [Sheet1$] Where [Date] <= 37822" and itworks.Do you know a way to use 07/20/2003?2. I need to sort my data twice, first by name and second by date. Is itpossible to sort twice in one query?Something like:"SELECT * FROM [Sheet1$] Where [Date] <= 07/20/2003 ORDER BY [NAME] ASC,ORDER BY [DATE] DESC"3. Even if the first row of my Excel sheet includes the headers, I cannot perform a query other than SELECT * FROM, for exemple, SELECT [NAME]FROM, does not work. do you know how to do that?Thanks in advance for sharing your experience,Phil*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Jul 20, 2005
1. If the TempDB Database is deleted from MS-SQL Server what willhappen..?2. How to insert a not null column in an existing table withrecords..?3. If a table is deleted, what will happen for the Stored proceduresand Views, which that table reffered..?
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Aug 14, 2007
Hi All,
I was asked couple of questions yesterday and I thought I had to still learn a lot. Questions sound very normal but as for as I am concerned, don't know the answers hence this forum.
Please advise.
Here the questions asked to me
1) A simple insert into the table (could be from .net application or query analyzer) takes 10 minutes and times out, does not do any thing. What could be the reason and how would you identify and resolve the problem.
2) A simple select from table taking 10 minutes( assuming there are only there columns in the table,those are,
id, name, description)
id being identity column and has got index as well. What could be the reason and how would you identify and resolve the problem?
3) How would you change the identity column value or can we change the identity value and how?
4) How would you use the shared, update, exclusive locks in the sql statement.?
Please let me know.
Regards,
nw
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Mar 13, 2007
Q1: What is the differences between green and red connections between objects in Data Flow tab in SSIS project?
Q2: In Flat File Connection Manager --> New Button --> header row delimiter --> what is meant by {CR}-{LF}?
Thanks alot,
Bishoy
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Nov 17, 2006
Good Morning..
i have started developing on DTS recently. and i have a few question about "How-To" issues.
Hope you guys can help
1) I noticed, whenever i want to "redirect row" whenever an error happen, i need to set my AccessMode to OpenRowSet... This mode as i noticed, cant be used when i am tranferring data into a sql table which has primary key set
e.g. Ms Access which has identity -> SQL table with PK set
Is there anyway, to capture the row error in my situation?
2) Another question is, in a data flow... can i have a source which has multiple output arrow.
Sorry for the inconvenince,Thank you in advance
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Nov 3, 2007
The <Protect Sensitive Data Using Encryption in SQL Server 2005> said : If regenerate service master key with "FORCE" option, the keys protected by old service master key are lost forever along with the data encrypted by them.
I create a master key in database and create a certificate protected by it.Then i use the certificate to encrypt some data.
The master key also exists and the encrypted data can by decrypt after i regenertate the SMK with force option.
So i'm puzzled,I want to know what are the keys which protected by SMK , are they database master key?
thanks
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Sep 26, 2006
Hi,
I have few questions about SQL Server, let me mention here..
How to generate XML File from SQL Server? Is there anyway can we generate directly from Query?
What are Temporary tables (Regular & Global) and where do we need them in Real Time?
What are BCP Statements? where do we need them?
How to pass XML Document to Proc, and insert the data, any example?
Types of Triggers?
Shink data, what is that?
What T-Read, Uncommitted read?
What is Replication ?
Thanks
Seshu
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