SLOW Performance On Table With Image Fields (SQL 2000)
Nov 15, 2006
Hi
We have a SQL server 2000 SP4 on a windows 2003 2x3Ghz XEON 4 GB ram.
We have a table looking like this with currently 6 rows. Total data is aprox
10 kb i all row all together.
CREATE TABLE [dbo].[BIOMETRICPROFILE] (
[BIOMETRICPROFILEID] [bigint] IDENTITY (1, 1) NOT NULL ,
[FINGERPRINTTEMPLATE1] [image] NOT NULL ,
[FINGERPRINTTEMPLATE2] [image] NOT NULL ,
[FINGERPRINTTEMPLATE3] [image] NOT NULL ,
[FINGERPRINTTEMPLATE4] [image] NOT NULL ,
[FINGERPRINTTEMPLATE5] [image] NOT NULL ,
[FINGERPRINTTEMPLATE6] [image] NOT NULL ,
[TYPE] [nvarchar] (50) COLLATE Danish_Norwegian_CI_AS NOT NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
select * from BIOMETRICPROFILE takes ~4 seconds (!) to execute thourgh Query
analyzer. Alle other tables has no performance problems.
We have a SQL 2005 express instalation on the same server. If we restore a
backup from the sql 2000 database the query takes aprox ~ 15 ms.What is
going on here?
Has SQL 2000 problems with image fields? or how can we find the problem?
Regards
Anders
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Sep 25, 2007
Hi,
I have a table defined as such:
PosterArtId int no 4 10 0 no (n/a) (n/a) NULL
Graphic image no 16 yes (n/a) (n/a) NULL
GraphicFilename varchar no 50 no no no SQL_Latin1_General_CP1_CI_AS
I have a Stored Procedure defined in the database that queries this table (joins with some other tables) that takes about 1 1/2 minutes to return results (running directly in query analyzer). The table itself has 8900 records and the resulting stored procedure returns 33 rows.
I have backed up this database and restored it to another database on a different machine also running SQL Server 2000. When I run the same stored procedure on this 2nd database (note the contents of the database and this table are exactly the same), it runs very quickly - in about 2 seconds.
I'm trying to figure out what is causing the query to run so slow on the original database, which is our production database server (note that none of the other queries seem to be running extra slow on this machine, just this particular one).
I've since been reading up on storing images in the database and I don't think the images are stored "text in row" - I ran the command: €œSELECT OBJECTPROPERTY(OBJECT_ID('tblPosterArt'),'TableTextInRowLimit')€? and got a 0 return value.
My ultimate goal is to figure out:
1) why the timing is so different on the two databases even though the have the same data
2) is there something we can do to speed up the results on our production server
For the first goal, I'm heading down the path that something in the database backup/restore did not recreate the btree storage of the image data in the same manner. Would this be correct? If not, is there some kind of analysis that I can do that will tell me some useful information?
I've run the Stored Procedure for both databases in query analyzer with the "show execution plan", "trace", and "statistics" turned on. In the Execution Plan of the production database I see a significant amount of time in three areas: Nested Loops/Left Semi Join, Clustered Index Scan, and Clustered Index Seek. But being as I'm not a dba (nor do we have one on staff), I'm not sure how to interpret this data. I keep wanting to point to some sort of environment issue since the data is the same between the two machines.
I suppose there is nothing to do about the 2nd goal without knowing why the query on the one machine is taking so long. Any thoughts on how to get more information here?
Thanks,
Beth
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Jul 9, 2001
In my database/MY SERVER (SQL7/Win2K), I run a simple query with a Table/10000 rows (without cluster index):
SELECT * FROM TABLE
it take over 30s. Why it's slow? How can I check for reason? How to configure my server to improve performance?
Thanks in advance.
TH
----------------------------------
SP_CONFIGURE's RESULT in MY SERVER
----------------------------------
Table 'spt_values'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 0.
name minimum maximum config_value run_value
----------------------------------- ----------- ----------- ------------ -----------
affinity mask 0 2147483647 0 0
allow updates 0 1 1 1
cost threshold for parallelism 0 32767 5 5
cursor threshold -1 2147483647 -1 -1
default language 0 9999 0 0
default sortorder id 0 255 52 52
extended memory size (MB) 0 2147483647 0 0
fill factor (%) 0 100 0 0
index create memory (KB) 704 1600000 0 0
language in cache 3 100 3 3
language neutral full-text 0 1 0 0
lightweight pooling 0 1 0 0
locks 5000 2147483647 0 0
max async IO 1 255 32 32
max degree of parallelism 0 32 0 0
max server memory (MB) 4 2147483647 2147483647 2147483647
max text repl size (B) 0 2147483647 65536 65536
max worker threads 10 1024 255 255
media retention 0 365 0 0
min memory per query (KB) 512 2147483647 1024 1024
min server memory (MB) 0 2147483647 0 0
nested triggers 0 1 1 1
network packet size (B) 512 65535 4096 4096
open objects 0 2147483647 0 0
priority boost 0 1 1 1
query governor cost limit 0 2147483647 0 0
query wait (s) -1 2147483647 -1 -1
recovery interval (min) 0 32767 0 0
remote access 0 1 1 1
remote login timeout (s) 0 2147483647 5 5
remote proc trans 0 1 0 0
remote query timeout (s) 0 2147483647 0 0
resource timeout (s) 5 2147483647 10 10
scan for startup procs 0 1 0 0
set working set size 0 1 0 0
show advanced options 0 1 1 1
spin counter 1 2147483647 10000 10000
time slice (ms) 50 1000 100 100
two digit year cutoff 1753 9999 2049 2049
Unicode comparison style 0 2147483647 196609 196609
Unicode locale id 0 2147483647 1033 1033
user connections 0 32767 0 0
user options 0 4095 0 0
Table 'spt_values'. Scan count 43, logical reads 108, physical reads 0, read-ahead reads 0.
Table 'sysconfigures'. Scan count 1, logical reads 2, physical reads 0, read-ahead reads 2.
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Jul 12, 2007
hi all,
i have created a table with image field in it. Now i just want to store a jpeg file in it but not finding any way to do so.
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Jul 20, 2005
I need a second opinion from someone out there. I have a database with about20 tables. Each of these tables need to store one or maybe more images foreach record. I cannot use a varchar field to point to an image file on theserver.Therefore, I am trying to figure out if its better for me to put an imagefield in each table OR make a table called IMAGES that has multiple NullableForeign keys and use one table for all images. My dilemma is that eachrecord will have a lot of Null values because I will only be using one ofthe foreign key fields for each record in the IMAGES table.For example, an IMAGES table with the following fields:ImageId int PKFK1 int NullableFK2 int NullableFK3 int NullableFK4 int NullableFK5 int NullableImageData imagePlease help if you have some experience in storing images and files in a SQLimage field type.--Peter A.
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Hi,
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Facts
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Thanks
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Jun 5, 2004
Hi
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When we start with 5 users it is not slow, when all the users say 30 comes in it is slow down.
Can some one help to find out what is the problem.
Thanks
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Nov 29, 2005
I'm still new to SQL Server so some of my lingo/verbage may be incorrect, please bare with me.
The company I work for relies strictly on ASP and SQL Server for 85% of it's daily operations. We have some Access projects and some VB projects as well, but for the majority it's ASP and SQL Server.
Previously we had 2 T1 lines with something like 3MB a piece and a handfull of Dell Servers. Our main server is also a Dell running Windows Server 2003 and is hosted through a reputable company here in town. They have a host of fiber lines running all over so I know we're getting good throughput. We've actually just upgradded to a DS3 but we're still working out the kinks with that. Anyway, I just want to eliminate that up front - we have great connection speeds.
The problems lies, I believe in our database design. The company supposedly had a DBA come in and help setup the design some 3 or 4 years ago, however even with my limited knowledge I feel like something is just not working right.
Our main table is "Invoices" which is obviously all of our Invoices, ever. This table has an Identity field "JobID" which is also the Clustered Index. We have other Indexes as well, but it appears they're just scattered about. The table probably 30-40 fields per row and ONLY 740,000 rows. Tiny in comparison to what I'm told SQL Server can handle.
However, our performance is embarassing. We've just landed a new client who's going to be brining us big business and they're already complaining about the speed of their website. I am just trying to figure out ways to speed things up. SQL is on a dedicated machine I believe with dual Xeon processors and a couple gigs of ram. So that should be ok. THe invoices table I spoke of is constantly accessed by all kinds of operations as it's heart of what we do. We also have other tables such which are joined on this table to make up the reporting we do for clients.
So I guess my question is this. Should the Clustered Index be the identify field and is that causing us problems? We use this field alot for access a single Invoice at a time and from what I understand this makes it a good Clustered Index, because the index IS the jobID we're looking for. But when it comes time to do reporting for a client, we're not looking at this field. We just pull the records for that Clients Number. And we only have 1400 clients at this point. So if we were to make the "ClientID" field the Clustered Index, it would much faster to Zero in on the group of Invoices we wanted because the ClientID is ALWAYS included in our queries.
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Sorry I wrote a book.
Ideas? This place has always helped me before, so thanks in advance!
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Feb 11, 2007
Hi,
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Best Regards,
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Jul 31, 2007
dear friends,
i have dropped many objects and recreated in a database.suddenly my database became very slow. so please any one of friends give solution.
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Feb 7, 2008
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Jul 23, 2005
I have a stored procedure that has some problems with slow performance.The procedure has 2 parameters@firstnamevarchar(100)@lastnamevarchar(100)These parameters can have values like a%, that is wildcard searches.The strange thing is that if one of the parameters has the value %, andthe other one a%, the performance is very bad.If i subsistute the variables with exactly the same values hardcoded inthe where-clause, the query is very fast.If both variables has some characters prepending the percent sign, theperformance is better.SELECT distinct u.user_id, u.username, u.status_idFROM statusnames sn, statuses s, users u, users_persons up, persons p,users_roles urWHERE p.lastname like @lastnameAND p.firstname like @firstnameAND s.status_id = u.status_idAND sn.statusname_id = s.statusname_idAND u.user_id = up.user_idAND up.person_id = p.person_idWhat makes SQL server behave so differently with variables andhardcoded values?
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Feb 19, 2008
Hi,We have shifted one of our data processing to a new instance of SQL2005. For this a new DB was created in SQL2005 and it is not anupgrade of SQL200 DB.The data processing application is a VB6 application that runs a batchprocess to insert about4.5 million records everyday in this SQL 2005 database. I am usingADO(ver 2.6) Connection object to execute T-SQL insert statements toinsert the 4.5 mill. records.This same application used to insert the data in the SQL 2000databaseand used to take about 2.5 hours to do so. After moving it to SQL2005 the performance has really detriorated and it now takes morethan6 hours.Is there any configuration change that I need to do in SQL 2005?Please help.Note: There is also an instance of SQL 2000 running in the sameserver.TIA,Tawfiq
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Apr 12, 2007
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Dec 10, 2007
Hi.
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May 8, 2006
An SSIS package to transfer data from a DB instance on SQL Server 2005 to SQL Server 2000 is extremely slow. The package uses an OLEDB Source to OLEDB Destination for data transfer which is basically one table from sql server 2005 to sql server 2000. The job takes 5 minutes to transfer about 400 rows at night when there is very little activity on the server. During the day the job almost always times out.
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Oct 22, 2004
When working with databases containing myriad of huge tables, I am very much tempted to create categorized views on those tables in order to simplify and facilitate data query programming? Some developers I talk to say such views generally slow down query performance. Is this true?
Thanks.
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Aug 1, 2005
I have a table with about 20,000 records. So, to minimise performance issues, i try to only retrieve the top 100 records. The databaset retrieved can be paged and sorted. Below is my code, but it's taking quite a while even to only load the 100 records. Any suggestions?Private Sub BindGrid() Dim connectionString As String = "MyConnectionString" Dim dbConnection As System.Data.IDbConnection = New System.Data.SqlClient.SqlConnection(connectionString)
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Mar 7, 2003
DECLARE @num int
SET @num = 0
DECLARE @tableVariable table(ColA int, ColB decimal(18,4))
WHILE @num < 1000
BEGIN
INSERT INTO @tableVariable VALUES (2, 10.56)
SET @num = @num +1
ENDWhen this code is run in SQL Server 2000 Query Analyzer it commits in less than 1 second.
The same code run as a SQLServerAgent job takes 16 seconds.
Similar behaviour appears if INSERT statement is substituted with UPDATE.
SELECT statement runs equally nice on both alternatives.
Has anybody got an idea what might be the reason for slow execution of INSERT and UPDATE in a job?
Thanks,
teetjott
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May 5, 2004
Will anyone be willing to direct me to a specific kb article for my problem? I've read the following articles: 251248,244661,259959, 280106 regarding troubleshooting a link to an Oracle server from SQL Server.
Our query performed very well (took 1 second) until the Oracle database was upgraded to 9i. To test we have links to both production and test on our test box. We are running SQL Server 2kSP3. Both Oracle databases are at 9i.
The query running against production (which is on a bigger, faster Unix box) runs in 5+ minutes whereas the same query run against their test, takes 1 second.
Using the Oracle client tool, SQLPLUS, the data comes back at lightening speed, but when the data goes through SQL Server, using the link to the Oracle production database, it has horrible performance.
Both database links are created the same. Both links display the table list of tables in Oracle in about the same amount of time when looking through EM. I've verified the presence of the mtxoci81_win2k.reg in the correct path.
The Oracle dba assures me that, other than a larger SGA and similar init parameters (which would be expected for a production environment), the other init parameters are the same. I've supported Oracle over the years (although I prefer SQL Server), and I respect this dba. He is thorough.
I've also changed the Server Options on the database link definition, checking them all and removing them 1 at a time and testing my query at each step. The last thing I'm looking at is the Provider Options, in case those settings are affected by the production Oracle 9i environment. I'm not coming up with much information regarding the Provider Options, hence my question to you.
The only other piece that I can see might be an issue would be that we have our sqlnet.ora file renamed. When present, our links don't work, when renamed, they do.
Any ideas or suggestions would be greatly appreciated!
TIA,
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Jul 23, 2005
Hi,Can't post specifics at the moment but if this seems like a commonproblem any help would be appreciated.When querying with ~6 tables, using mostly left outer joins, I getstandard performance with the where clausewhere XXX is not nullhowever, if I try the clausewhere XXX = 4the query takes upwards of 5-6 minutes (I just stop it running at thatpoint.The field XXX is in the 'main' table (to which the joins attach), it'san integer field too so I can't see too many problems there.There's no index on the XXX field, but if I remove the joins, I getstandard performance doing either query.So why would the second query's performance differ so significantly?Cheers,Chris
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