How To Analyze Slow Performance Queries
Feb 27, 2008
Hi All
I struck up with Slow perfornace query,Please some body help me how to analyze Slow perforamnce queris.
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Slow Queries
Mar 15, 2001Hi,
Some of my queries are running too slow.It's taking as long as 30secs .Earlier the same query was taking less than 5 secs.
I understand the db has grown BUT I do not know to look at this query where should i start from and what should I look into.
It is on production server.
the db size is 15GB and unallocated is 9GB.
log space used is 4%.
TIA.
Slow Queries
Oct 10, 2002Howdy. I have a table in my DB that has about 2 million records. The search times are taking 15 - 30 seconds depending on the number of records I am returning. Is this normal? The machine is NT 4 sp6a Dual PIII 866's with 1 GB of RAM on RAID5 SCSI disk. This seems like a long time to me. What kind of performance should I expect? Any kind of tuning steps I can take?
Thanks
Shane
Slow SQL Queries
Jan 5, 2005Hi All,
Am very new to SQL server so don't really understand what effects the speed of queries. I have the two below queries, which are nearly the same apart from one has a right join and the other doesn't. The both return about 5000 records, and I am implementing this query from an accss databse with an odbc link to sql server. What I don't understand is it takes about 8 seconds for the query with the right join in to return the records and only about 4 seconds for the one without. What I'm after really is just some general advice on how to bulid fast queries, and any advice on the two below queries would be nice. Thanks
SELECT Employees.Name, Calls.CallDate, Calls.CallTime, Calls.Callername, Contacts.CompanyID, Contacts.ContactID, Calls.CallerNumber, Calls.CallerCompany, Calls.ActionTakenID, Calls.OperatorID, Calls.Confirmed, Calls.Charged, Calls.Notes, Company.CompanyName, Operators.Operatorname, Calls.CallID, Calls.ShortMessage
FROM (Contacts INNER JOIN Company ON Contacts.CompanyID = Company.CompanyID) INNER JOIN (Operators INNER JOIN (Employees RIGHT JOIN Calls ON Employees.EmployeesID = Calls.EmployeesID) ON Operators.ID = Calls.OperatorID) ON Contacts.ContactID = Calls.ContactID
WHERE (((Contacts.ContactID)=1442))
ORDER BY Calls.CallDate DESC , Calls.CallTime DESC;
SELECT Employees.Name, Calls.CallDate, Calls.CallTime, Calls.Callername, Contacts.CompanyID, Contacts.ContactID, Calls.CallerNumber, Calls.CallerCompany, Calls.ActionTakenID, Calls.OperatorID, Calls.Confirmed, Calls.Charged, Calls.Notes, Company.CompanyName, Operators.Operatorname, Calls.CallID, Calls.ShortMessage
FROM (Contacts INNER JOIN Company ON Contacts.CompanyID = Company.CompanyID) INNER JOIN (Operators RIGHT JOIN (Employees RIGHT JOIN Calls ON Employees.EmployeesID = Calls.EmployeesID) ON Operators.ID = Calls.OperatorID) ON Contacts.ContactID = Calls.ContactID
WHERE (((Contacts.ContactID)=1442))
ORDER BY Calls.CallDate DESC , Calls.CallTime DESC;
Need Help Optimizing Slow SQL Queries (?)
Aug 6, 2007Hi, I have absolutely no knowledge of PHP or SQL .... I moderate a PHPBB forum at www.savingshelterpets.com
Our web host (SiteGround) has taken our site down temporarily because we are overloading the server. I have no idea how to fix the problem, so hopefully someone here can help me out! Smiley
PHP version 4.4.4
MySQL version 5.0.27-standard-log
Here's the info sent to me by SiteGround (I don't understand a word of it!):
quote:Upon further investigation, it turned out that the following queries in your account are slow and heavily consume server resources:
# User@Host: savingsh_phpb1[savingsh_phpb1] @ localhost []
# Query_time: 4 Lock_time: 0 Rows_sent: 1 Rows_examined: 1284
use savingsh_phpbb2;
SELECT user_id, username, user_password, user_active, user_level, user_login_tries, user_last_login_try
FROM phpbb_users
--
delete from rs_stat_ip where platnost_do<'2007-08-03 16:49:43';
# User@Host: savingsh_phpb1[savingsh_phpb1] @ localhost []
# Query_time: 5 Lock_time: 3 Rows_sent: 1 Rows_examined: 0
use savingsh_phpbb2;
SELECT * FROM phpbb_optimize_db;
# User@Host: binaryte_lhlp1[binaryte_lhlp1] @ localhost []
--
# Time: 070803 16:50:27
# User@Host: savingsh_phpb1[savingsh_phpb1] @ localhost []
# Query_time: 4 Lock_time: 2 Rows_sent: 1 Rows_examined: 0
use savingsh_phpbb2;
SELECT t.topic_id, t.topic_title, t.topic_status, t.topic_replies, t.topic_time, t.topic_type, t.topic_vote, t.topic_last_post_id, f.forum_name, f.forum_status, f.forum_id, f.auth_view, f.auth_read, f.auth_post, f.auth_reply, f.auth_edit, f.auth_delete, f.auth_sticky, f.auth_announce, f.auth_pollcreate, f.auth_vote, f.auth_attachments
FROM phpbb_topics t, phpbb_forums f
In order to have the limitations removed, please optimize your script.
Slow Queries In SQL Express
Jul 17, 2007Some queries take a long time to complete.
Setup is:
- SQL Express SP2
- Windows Vista Business
- 2 GB RAM
- Core 2 Duo processor
- Connecting to (local) server with SQL Authentication
- only 1 Instance of MSSQLSERVER
Simple queries (SELECT * FROM TableName) wher the table has only a few records. This query may take up to 30 or more to execute. This slowness is consistent to certain tables. Other much larger tables run queries fine.
If a different computer logs in to the same server, queries provide instantaneous results.
Large Table, Really Slow Queries
Jul 26, 2007I'm working with a table with about 60 million records. This monster is growing every minute of the day as well, by 200,000 - 300,000 records/day. It's 11 columns wide, and has one index on a datetime column. My task is to create some custom reports based on three of these columns, including the datetime one.
The problem is response time. Any query executed on this table takes forever--anywhere between 30 seconds and 4 minutes. Queries such as this one below, as simple as it is, can take a minute or more:
select
count(dt_date) as Searches
from
SearchRecords
where
datediff(day,getdate(),dt_date)=0
As the table gets larger and large, the response time is going to get worse and worse. Long story short, what are my options to get the speed of queries down to just a few seconds with a table this big? So far the best I can come up with is index any other appropriate columns (of which there is one for sure, maybe two).
Query Analyzer Very Slow For Even Trivial Queries
Oct 12, 2005I've been using MS-SQL Server for many years but never come across this problem before.
When I try and run a very simple query from Query Analyzer it takes a LONG time. Even when there are no tables involved!
Even:-
select 1
go
takes 28 seconds to return '1' when running against the local server. i.e. both QA and the Server are running on the same machine.
Can anyone help explain how to get my performance back! Thanks.
Queries Are Slow When Accessed From Remote Machine
May 30, 2007Hi,
I have succesfully created a Stored Procedure which runs under 2 seconds locally.
However when i run the same proc from another machine in the LAN, the response times vary from 5 sec to over 40 Secs and even occassionally times out.
My server is SQL 2005 Dev Edition (32 Bit) running on a Dual Core Box with 2GB memory.
Any Ideas why this would be happening?
Slow Execution Of Queries Inside Transaction
Apr 11, 2006
I have some VB.NET code that starts a transaction and after that executes one by one a lot of queries. Somehow, when I take out the transaction part, my queries are getting executed in around 10 min. With the transaction in place it takes me more than 30 min on one query and then I get timeout.
I have checked sp_lock myprocessid and I've noticed there are a lot of exclusive locks on different objects. Using sp_who I could not see any deadlocks.
I even tried to set the isolation level to Read UNCOMMITED and still have the same problem.
As I said, once I execute my queries without being in a transaction everything works great.
Can you help me to find out the problem?
Thanks,
Laura
Large FullText Tables - Slow Queries
May 31, 2007Hi,
I currently have a large table (35 million rows, over 80GB). I have one varchar(max) column on the table that is used in the fulltext index.
To query the complete index is fast, for example:
SELECT 'ipod', COUNT(*)
FROM CONTAINSTABLE(MyDB.dbo.Contents, [Body], 'ipod') CT
This took 70 seconds (which I can live with). However, I seldom run queries like this, most are more like:
SELECT 'ipod', COUNT(*)
FROM CONTAINSTABLE(MyDB.dbo.Contents, [Body], 'ipod') CT
JOIN Pages ITP ON ITP.PageID = CT.[Key]
JOIN Feeds ITF ON ITP.IPID = ITF.IPID
JOIN Buyers ITB ON ITB.IBID = ITF.IBID
WHERE ITB.ID IN (1342,246)
These queries are much slower (this example took 17 minutes). I understand that FT searches the index and returns all rows that match the query to SQL. SQL then performs the joins and counts only the correct results. (Correct me if I'm wrong here).
One solution I've seen to this to put data or "tags" into the FT column - so my Body column would become something like:
'{ID:1342}' + [Body]
That sounds like a very good idea. I could then change the 2nd query above to be:
SELECT 'ipod', COUNT(*)
FROM CONTAINSTABLE(MyDB.dbo.Contents, [Body], '("ID:1342" OR "ID:246") AND "ipod"') CT
That all works well until I want to select 1000 different ID's because the FT query will become very long and complex. Also I'm only including one column (ID) in this example - but I have about 7 or 8 columns that I would need to include in these "tags". Quering multiple columns become very complex quickly and no doubt I will reach a query limit at somepoint.
If anyone has any other suggestions to the above I'd love to hear them. Another thought I'm having is to partition the table. I can find very little online about how FT behaves on partitioned tables - I fear it behaves exactly the same, what I'd like to think is that I could partition the table on an ID say 100 per partition or something, and then fulltext would only search the relevant partitions. If it behaves like this it may work. If no-one knows then I'll give it ago, but this will take me a while due to the table size - so I'm hoping one of you clever lot know!
Many thanks for any advice.
Simon
Slow Performance
Mar 24, 2007Hi all...
I need urgent help, about someting:
i've developed and deploy an aspnet web site (data works with sqlserver), but after a few minutes working with some users, the permormance slows and stop the site.
please help me what should i do......
Slow Performance Using DTS Sql 7
Mar 30, 2000I need to transfer a database from one server to another, I'm using the DTS utility because the servers have different sort orders. our database size is about 5GB which include about 2500 tables. Using DTS is taking many hours to transfer all objects and data. is there a better/faster way to do this?
Any help would be appreciated, Thank you
Slow Performance
Mar 31, 1999Help! I am new to SQL (6.5) and am designing a small database on a small LAN.
Everything seems to work fine until more than one user gets in the database.
It was originally an Access database and we upsized some of the information to SQL.
I have not upsized all the tables yet, and am not sure if that is causing a problem.
Since we are new to SQL we are trying to make all the changes in Access then upsize
everything. If this is the problem though, I will not be hesitant in upsizing.
Any ideas?
Slow Performance With Sp2
Dec 27, 2001Since sp2 a number of applications, specifically web ado access has slowed very badly and I seem to be seeing a high cpu usage too. Internal jobs such as backups and table defrags are not affected. I'm on a 4 way box with ample hardware .. stats indexes etc. are fine .. client access is just slow. I suspect mdac but I can't pin anything down and it's driving me crazy !!!!!
I've even built a new box with a fresh install but to no avail.
help ???
Not Again - Slow T-SQL Performance
Aug 24, 2004I'm running the following statements. They have been running for 48 hours and counting... In performance monitor, I can see the system is steadily 100% disc bound. Any idea how to get status or ETA on these? Any idea how I can speed up such actions? This seems unusually slow. There are no errors in the Error Log. Does other DBMS systems (such as Oracle) handle such scenarios more quickly or with better status information?
INSERT INTO Domains (Domain)
SELECT DISTINCT Domain FROM Stages WHERE Domain NOT IN (SELECT Domain FROM Domains)
UPDATE Stages SET DomainID = (SELECT Domains.[ID] FROM Domains WHERE Domains.Domain = Stages.Domain)
Stages is 173 million records
Domains is 2.4 million records
This is running on pretty decent hardware:
Windows 2000 SP5
SQL Server 2000 Enterprise Edition SP3a
Dual 3.06 GHz Xeons with HyperThreading enabled (4 virtual CPUs)
4GB RAM (OS 3GB switch is enabled to give SQL Server 3GB of RAM)
70GB SCSI boot drive
Data/Transaction Log is on a RAID 5, 30 spindle, fibrechannel SAN
Slow Performance
Aug 30, 2006Hi - I have MS SBA2007beta and Office Outlook 2007 BCM Beta. Both use SQL2005 and they are both as slow to point of being frustrating. Outlook2007 without BCM is fine and every other application runs fine if no SQL server apps are present.
I have this running on a 2.8ghz desktop with 1G memory and a Laptop of 1.8ghz and 1.5g memory. The laptop is far faster.
When SQL apps are running everything is slowed.
Slow Performance Using A View.
Jan 31, 2000Hello,
I have the same database on two different servers. One for production and one for testing. A view that I use runs in less than 2 seconds on the test system, but takes almost 2 minutes on the production server.
What I have noticed is on the test server the view will use an index. The production server ends up scanning a whole table. All indices are the same on both machines for the tables involved and I have updated the statistics. I even went through the process of creating a new table with its indices for the table that is being scanned. Both machines have had service pack 1 installed on them.
Any ideas?
Locks And Slow Performance
Jan 28, 2003An Application Times out with tons of SQL Server Locks but there is no log of any errors in SQL Servers. I checked all the Indexes and I reindex it but still same issues. CPU is 100% full at that time and users unable to do anything. Any ideas on how to fix it
View 1 Replies View RelatedSlow Performance In Sql Server
Jun 5, 2004Hi
We are facing performance related problem using Sql server 2000.
We have one stand alone P4 Pc (128 ram) and around 30 users access the sql server through network.
We have written our aplication in VB 6 and backend as Sql Server 2000. We have used Stored Procedure where ever necessary. We have used cursor location as Server side.
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
Help With SLOW SQL Server Performance
Nov 29, 2005I'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.
But because a "DBA" came in to design this setup, everyone is afraid to change it. I guess it's hard to explain without people sitting here going through the code and look at the structures of all our tables - but I guess what I need is like a guide of what to do to easily increase performance on SQL Server and the proper use of Clustered and Non-Clustered Indexs and how to mix and match those.
Sorry I wrote a book.
Ideas? This place has always helped me before, so thanks in advance!
MSSQL2000 Slow Performance Over VPN
Feb 11, 2007Hi,
I'm executing a stored procedure in my local LAN which executes another one in a loop and I update a Table. The number of loops is about 6300.
This operation takes about 25 seconds in my local LAN.
Then I try to execute though in a VPN which has an upload speed of 256 kbps. I open query analyser connect to the remote server which is must faster than mine and I just write exec mystoredprocname in order to execute the procedure. The performance is very very slow.
In 7 minutes 180 loops are completed out or 6300.
I really cannot understand this. What is the reason of such slow perfomance?? My ADSL model displays no activity when the procedure is executed. I just use the PRINT method in MSSQL in order to display the progress of the operation. I tried to comment it out but with no difference.
I also use SET NOCOUNT ON in order not to display the update results.
Can someone explain me the cause for this? Are there some tricks in order to improve the performance when a slow connection is used like a ADSL with a static IP? It seems that something wrong is happening here.
Best Regards,
Manolis Perrakis
Database Performance Is Very Slow
Jul 31, 2007dear 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.
DTS To SSIS - Very Slow Performance
Feb 7, 2008I have a bunch of packages that take views and create tables from them. Some of the views are rather complex, but the packages themselves are very simple... drop and re-create a table using the data from a view on the same server. We create a new DB for each year, and this year we've upgraded to a new server with SQL 2005, so our DTS packages on the 2000 SQL server had to be recreated in SSIS on the new server. No problem, as I said the packages are really simple. But when I create the packages in SSIS they now take an extremely long time to execute, and I cannot figure out why.
For instance, one DTS package would take approximately 5 minutes to run when the view contained hundreds of thousands of rows and the underlying tables contained millions. But now, even with MUCH smaller tables (since it's the beginning of the year, new DB) the SSIS package I created on the new server takes over an hour, literally. The view that the SSIS package is using to create the table only takes about 15 seconds to execute in management studio (only about 16,000 rows). How can this possibly take so long??
the new server is virtually the same hardware-wise... 4 x 2400mhz, 4gb ram, win2k3 server
Slow Performance Of Like Operator
Jul 23, 2005I 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?
View 6 Replies View RelatedSlow Performance In SQL2005
Feb 19, 2008Hi,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
View 3 Replies View RelatedPerformance Of Dataflow Too Slow ___
Apr 12, 2007I was transfering more that 100,000 records from flat file to sql table
It took about 1 hour.Is this the way it is?????i used oledb command.
As the data passes by i got to insert to several table.Like i insert some of incoming data to one table then get the key from that table and insert rest of the data with the key field from previous table to another table.
In this case i felt OLedb would be best as we can use query.
I cannot use oledb destination as it has only error output(to insert some of incoming data and i want to have a look up to get the key but oledb des has only error output)
i cannot use sql destination as the database is sql server 2000.It dosent let me.
How can i increase the performance????Please let me know
Slow Performance On Subscribers
Dec 12, 2005Hello all!
View 1 Replies View RelatedSlow Performance After Upgrade
Dec 10, 2007Hi.
I have successful upgraded from Windows 2000 / SQL Server 2000 to Windows 2003 / SQL Server 2005. Here is the process:
- Install Windows 2003 / SQL Server 2005 on new VM instance
- Detached SQL Server 2000 database -> Copy data to the new server and Attached to SQL Server 2005
- Run scripts to restore user login
- Change Compatibility level to: SQL Server 2005 (90)
Now, open 3rd party application and connect to the new database server (via IP address), the application was connecting ok and access data without no problem. However, database take more than 5 minute to connect/open instead of 30sec via the old the server?
Please adivse what could be the issue? Thanks!
Long Memory Grant Queue Waits In SQL Server Express SP2 Causes Slow Queries
Sep 10, 2007
I have a 2GHZ cpu with 1GB of RAM. I occassionally see very slow (long) queries against a local SQL Server 2005 Express (SP2) database. The issue occurs against different SQL Queries, but all queries are rather basic select statements Perfmon shows that the SQL Server counter for the "MEMORY GRANT QUEUE WAIT Avg MS" gets extremely high (25000+ ms). Perfmon also also shows that PAGING is not occuring, and the system is not under unsual stress. The problem is not reproducible with MSDE.
Has anyone seen this issue, or have any recommendations for a next course of action?
Do Views Slow Down Query Performance?
Oct 22, 2004When 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.
Slow Performance When Making A Query
Aug 1, 2005I 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)
Dim queryString As String = "SELECT TOP 100 [Person].* FROM [Person] ORDER BY " & viewstate("sortField").ToString() & " " & viewstate("sortDirection").ToString()
Dim dbCommand As System.Data.IDbCommand = New System.Data.SqlClient.SqlCommand dbCommand.CommandText = queryString dbCommand.Connection = dbConnection
Dim dataAdapter As System.Data.IDbDataAdapter = New System.Data.SqlClient.SqlDataAdapter dataAdapter.SelectCommand = dbCommand Dim dataSet As System.Data.DataSet = New System.Data.DataSet dataAdapter.Fill(dataSet)
Try DataGrid1.DataSource = dataSet DataGrid1.Databind() Catch e As Exception DataGrid1.CurrentPageIndex = 0 End TryEnd Sub
Jobs - Unexpected Slow Performance
Mar 7, 2003DECLARE @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