Tracking Actual Vs Estimated Database Usage.
Jun 17, 1999Hi,
I used to use a insert subselect on the 6.5 catalog table
Hi,
I used to use a insert subselect on the 6.5 catalog table
I have a stored procedure that will execute with less than 1,000 reads onetime (with a specified set of parameters), then with a different set ofparameters the procedure executes with close to 500,000 reads (according toProfiler).In comparing the execution plans, they are the same, except for the actualand estimated number of rows. When the proc runs with parameters that producereads that are less than 1,000 the actual and estimated number of rows equal1. When the proc runs with parameters that produce reads are near 500,000 theactual rows are approximately 85,000 and the estimated rows equal 1.Then I run:DBCC DROPCLEANBUFFERSDBCC FREEPROCCACHEIf I then reverse the order of execution by executing the procedure thatinitially executes with close to 500,000 reads first, the reads drop to lessthan 2,000. The execution plan shows the acutual number of rows equal to 1,and the estimated rows equal to 2.27. Then when I run the procedure thatinitially executed with less than 1,000 reads, it continues to run at lessthan 1,000 reads, and the actual number of rows is equal to 1 and theestimated rows equal to 2.27. When run in this order, there is consistency inthe actual and estimated number of rows and the reads for both executionswith differing parameters are within reason.Do I need to run DBCC DROPCLEANBUFFERS and DBCC FREEPROCCACHE on productionand then ensure that the procedure that ran close to 500,000 reads is runfirst to ensure the proper plan, as well as using a KEEP PLAN option? Or,what other options might you recommend?I am running SQL 2000 SP4.--Message posted via SQLMonster.comhttp://www.sqlmonster.com/Uwe/Forum...eneral/200609/1
View 4 Replies View RelatedI have found execution plan with significant difference between actual and estimated number of rows (roughly actual/2=estimated) in non-clustered index seek.Statistics are updated.
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View 8 Replies View RelatedI'm looking for monitoring page file usage for SQL Server. Ultimately, I'm trying to prove that there is not a problem with a server and that it is not struggling with the workload, but someone has looked at page file usage and suggested there is a problem.
I've set up performance counters running from a separate server, but the counters relating to page file usage seem wildly inaccurate. E.g., I've got (_Total\% Usage), and (Total)\%Usage Peak), with Total Usage showing a constant value of 64, and the peak showing 92. I've also got Process (sqlservr)Page File Bytes and Page File Bytes Peak, which are showing values like 61,275,688,960 and hardly dropping below this.
If I look at Performance Monitor directly the values shown in here correlate with this, as shown in my first screenshot. However, if I look at resource monitor and look at disk activity, you can see that there is basically nothing going on (screenshot 2).
The server is more than equipped to deal with the workload, and looking at other counters for SQL there is no indication of problems, e.g. page life expectancy has a minimum value showing of 576,258, there is never less than 6GB of free RAM, SQL compilations are at a maximum of 5% of batch requests.
It is a physical server with 2x 8 core multi threaded CPUs, 64GB RAM with 58GB as the SQL server maximum. Hopefully this is enough info, but I'm happy to check anything else.
The benefit of the actual execution plan is that you can see the actual number of rows passing through each step - compared to the estimated number of rows.But what about the "cost percentages" ?I believe I've read somewhere that these percentages is still just an estimate and is not based on the real execution.Does anyone know this and preferable have a link to something that documents it?Thanks
View 1 Replies View RelatedI have a view in SQLServer 2005. It took 30 sec. to finish. Then I deleted 4500 records from one table that is used in view. It took 90 sec. to finish now. I did a comparison on Actual Execution Plan between before I deleted data and after I deleted data, they are almost same, only different is Actual Number Rows become less after deleted data. So, I wonder why data become less but time become more. When I look closely on the Actual Execution Plan, the ridiculous thing is, there are only Estimated Operation Cost on each step, no Actual Operation Cost. I guess there are something wrong with optimizer because reuse same Execution Plan, but how can I tell which step wrong without Actual Operation Cost.
Thanks!
Henry
Does anyone know how to obain the actual creator of a database by using TSQL or SP? I need to know actual Login not DBO.
Thanks.
how can I create a database synonym for the actual database name?
View 3 Replies View RelatedHere is the situation. I have an employee who is making changes but I can't prove it. He thinks he knows more than he does and he's mess'n everything up. I would like to know if SQL or some third party product has the capability to see the change and log what was changed with the persons username attached?
View 1 Replies View RelatedHi everyone.
I am trying to find a way to calculate everyday my DB Growth, I did find a script on some site but it seems to give me the same information as the taskpad wich is not very specific. Basicaly i would like to know the size of a table in MB or in whatevever conversion possible, so that i will be able to do some forcasting.
Any help here would be greatly apreciated.
In addition to the column values, we are getting the below tag added throughout the table. It happens specifically to the columns with data type nvarchar and varchar and length >=100. We have 5 numbers of database but it happens only in one specific database. We doubt it to be sql injection but not sure how it happens. The impact is very severe on our clients. how to find the root cause. In that html tag have the url:...
Wilhite</title><style>.alwi{clip:rect(483px,auto,auto,427px);}</style><div
Blunt</title><style>.alwi{clip:rect(483px,auto,auto,427px);}</style><div>
Duran</title><style>.alwi{clip:rect(483px,auto,auto,427px);}</style><div>
Neiwert</title><style>.alwi{clip:rect(483px,auto,auto,427px);}</style><div>
Gerard</title><style>.alwi{clip:rect(483px,auto,auto,427px);}</style><div>
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[code]....
I am running both SQL Server 2000 and SQL Server 2005.
Lets say I have a live database that is version 1 for an application. The database is copied onto a development machine to develop version 2 of the application. I want to be able to take a snapshot of the database and then get a program to write all the changes made after the snapshot into sql code. This is so I can run this sql code on the live database and transform version 1 to version 2.
Is there any program/tool that will allow me to do this?
Jagdip
Does anyone know of software that tracks changes to a database? Forexample, it would track anytime an SP or view was recompiled, or ifyou added or deleted a column to a database?
View 1 Replies View RelatedI am very new to SSAS. I have two queries:
1) As per my project requirement, if the changes in SSAS cube are approved, they should be committed back to the actual SQL Server 2012 tables. Is that possible, if yes how?
2) For rolling back to original data I truncate the relevant writeback table and process the cube.
Does anyone know of any session management with mysql scripts that uses cjtracking?
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I have a client program that writes to sql server database 10 records per second . i want to compute the CPU usage and the memory usage for the whole program or CPU usage,memory usage for the insert statement in the program .
Can anybody help me with this?
Hello, When I am seeing SQL Server 2005 Management studio Server Dashboard> I am seeing my(USERS) databases and msdb database usage is very small % of in CPU Usage(%), Logical IO Performed (%) Usage pie chart.
90% of Total cpu usage is showing for Adhoc Queries. what excatly this means in Dashboard? if application uses more than it would have shown in Database level or not?
sicerely this dashboard is good, if any one is watching daily, please advice their experiences here.
Thanks in advance. Hail SQL Server!
Hi,
I have a requirement to create a Database usage report. The report should have - userid, user name, login time, database to which he has logged in, log out time, host machine id.
How do I go about generating this type of report. What system tables are to be refered?
Please help.
Thanks
Sri
database schema seems just a tag ?
I have found some materials about schema, they said ,schema is seperated from owner.
But , no materials are talking about what things schema can do / how to programming with schema.
What does 'tablename. index... cost: 100%' mean when I use display estimated execution plan?
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Hi,
I am writing a client application that shows estimated queries plans and statistics. I know how to obtain estimated plans by using SQL Server Management Studio. But is it possible to obtain by using database functions?
I have found sys.dm_exec_query_plan, but it seems that this function can only be used for executed (or executing) queries...
Thanks
I am trying to compute the actual size of data and indexes in my database.
I have used DBArtisan,Desktop DBA and SEM , they all gave me different results.
Does any body now a valide , correct way of determining the size and the utilization of the database.
-Also I am trying to come up with archive/purge procedures , is their publications,white papers or ideas about this issue.
Thanks in Advance
Elias Akouri
Dear friendsI am conducting a survey on Relational Database usage and would likeyour help. The study is part of my MBA Dissertation.Could you kindly spare 5 minutes to take part in this survey?http://FreeOnlineSurveys.com/rendersurvey.asp?id=120816ThanksRajeev
View 11 Replies View RelatedHello,
i am making a Fulltextsearch on MS SQL Server 2005 (indexed, with "Contains").
Because of performance reasons i am only showing the first 200 rows mssql finds ("select top 200...:").
Is there any possibility to get the estimated totalnumber of all rows? i have heard something that is possible to get this in mssql-server. The server then estimates how many rows with that searchword could be in the whole database. google i.e. makes the same thing....
is that true? what do i have to do to get this?
greetings and thx
cpt.oneeye
I am running an update query.It is taking long time. To find the estimated completion time i checked sys.dm_exec_request or sys.dm_exec_session or sp_who2 but there is no clue. It is showing as zero.
View 3 Replies View RelatedHi,
I would like what represente the value of Estimated I/O . Is that estiamted number pages or somethings else?
Thanks for help.
Tietie
What's the use of display estimated execution plan....
View 4 Replies View RelatedWhen I generate an estimated execution plan from Management Studio, one of the things I often see in the execution plan generated is an 'Index Scan'. When I put my mouse over the 'Index Scan' graphic, I will see a window display with something called 'Output List' at the bottom of the window. Do I understand correctly that SQL Server will scan my index looking for values in each of the fields included in this output list?
Thanks, Amos.
Hi,
I am using SQL Server 2005. I want to know about display estimated execution plan feature.
Please help!!!
Hey,
Is there somewhere in MSDE (or SQL) where you can see how many transaction are made to a sertain database or by a sertain user? At this way i could figure out witch database/user uses most (or least) recources (cpu) over a period of time.
I am looking for the script to find the CPU usage for each database like this
Test1DB76.00%
Test2DB12.00%
Test3DB1.21%
Test4DB20.08%
I can use Profiler to see database usage activity. However, in addition to it, is there a good query I can use to see whether user databases are being used (last select, last update, last alter or last delete etc., with date/time stamp)?I am looking for both SQL2000 and SQL2005 as we need to decommission some of the older servers.
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