How do u clear Cache in SQL
if i run a query once it takes 10 seconds and if i run the same query again it takes 1 second because it is cached. So i want to know how i can clear it because i want do some benchmarking on a query that is in cache
We are troubleshooting a performance problem and the test result is slow the 1st time but the subsequent runs are faster.. Logging out of application and log back in ( connecting to a new database session) did not clear the buffer cache as I thought it would.. When does the database clear the buffer cache? Is it not per database session?
I can issue CHECKPOINT and then run DBCC DROPCLEANBUFFERS to clear the buffers in the disk. But since we are testing from the application,do we need to run these commands via application code to clear buffer/per database session OR can we run these commands from a management studio session?
I am trying to improve the performance of a query. No matter how badit runs the first time, it runs really fast the second time.So how can I tell if I've done anything to improve the query if italways comes back quickly after the first run? I assume thequery/data/plan is in cache - how can I clean it out for my session?Thanks in advance for any help you can provide -
View 4 Replies View RelatedIs there anyway to clear the procedure cache of a single procedure?
View 9 Replies View Related Im getting this error when trying to set up a cache dependency...are there any special permissions etc?From CS:SqlCacheDependency dep = new SqlCacheDependency("MySite-Cache", "Products");Cache.Insert("Products", de.GetAllProductsList(), dep); From connectionStrings.config:<add name="SiteDB" connectionString="Data Source=localhost,[port]SQLEXPRESS;Integrated Security=true;User Instance=true; AttachDBFileName=|DataDirectory|ASPNETDB.MDF" providerName="System.Data.SqlClient" />Also tried this using my machinename<add name="SiteDB" connectionString="Data
Source=<machinename>,[port]SQLEXPRESS;Integrated Security=true;User
Instance=true; AttachDBFileName=|DataDirectory|ASPNETDB.MDF"
providerName="System.Data.SqlClient" /> From web.config: <caching> <sqlCacheDependency enabled="true" pollTime="10000"> <databases> <add name="MySite-Cache" connectionStringName="SiteDB" pollTime="2000"/> </databases> </sqlCacheDependency> </caching> EDIT: So making progress I can't seem to get the table registered for cache dependency:The sample i have says"aspnet_regsql.exe -E -S .SqlExpress -d aspnetdb -t Customers -et"and the command line response is "Enabling the table for SQL cache dependency..An error has happened. Details of the exception:The table 'Customers' cannot be found in the database."Where does this "Customers" table come from? There is obviously not an application specific "Customers" table in aspnetdb I'm confused probably more by the example than anything....
Is there a way to drop clean buffers at the database level instead of the server/instance level like the undocumented €œDBCC FLUSHPROCINDB (@dbid)€??
Is there a workaround for €œdbo€? to be able to flush procedure and data cache without being elevated to €œsysadmin€? server role?
PS: I am aware of the sp_recompile option that can be used to invalidate cached execution plans.
Thx.
Hi guys,
I am looking at the plan caches/cached pages from the perspective of
sys.dm_os_memory_cache_counters and sql serverlan Cache - Cache Pages
For the first one I am using
select (sum(single_pages_kb) + sum(multi_pages_kb) )
from sys.dm_os_memory_cache_counters
where type = 'CACHESTORE_SQLCP' or type = 'CACHESTORE_OBJCP'
a slight change from a query in
http://blogs.msdn.com/sqlprogrammability/
For the second just perfmon.
The first one gives me a count of about 670,000 pages only for the object and query cache and the second one gives me a total of about 100,000 pages for five type of caches including object and query.
If I am using the query from http://blogs.msdn.com/sqlprogrammability/ to determin the plan cache size
select (sum(single_pages_kb) + sum(multi_pages_kb) ) * 8 / (1024.0 * 1024.0) as plan_cache_in_GB
from sys.dm_os_memory_cache_counters
where type = 'CACHESTORE_SQLCP' or type = 'CACHESTORE_OBJCP'
it gives me about 5 GB when in fact my SQL Server it can access only max 2GB with Total and Target Server Memory at about 1.5 GB.
Does anyone have any idea what is going on?
hi thank you for this solution Hugo (dutch?) and it's very handy, thankyou but my issue is that we created dozens of views with my function.This functions returns an integer of a date. This function has to give alowerlimit and higherlimit back when dates are out of Calendar range.But i want to read this from the Calendartable ONCE and store it in aglobal variable somewhere in SQL Server. I DON'T want to referencetables in my function. SO read once the lower- and upperlimit and usethis variable/property for referencing in my function!!GreetzHennie*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
View 11 Replies View RelatedOn Microsoft performance monitor, what is the difference between SQL Server Cache Manager: Cache Hit Ratio and SQL
Server Buffer Manager: Buffer Cache Hit Ratio? We have a production server where the buffer cache hit ratio is
consistently at 99%, which is normal. However, the cache hit ratio is 73%. What is the difference between the two
hit ratios, and why would we have such a significant difference between the two?
Any help or advice would be much appreciated.
Is there a way to clear all the records in a table in Microsoft SQL
Server Management Studio instead of selecting all the rows and delete?
I'm trying to clear a database transaction log that has gotten much too large. I backed it up hoping that this would clear the "active" log, but now I just have two copies of a huge transaction log. How do I clear the active log?
Thanks in advance.
Hi....Does anyone know if there is a similar command to SQL2K's DBCC ERRORLOG.
I'm currently writing a preventative maintenance script and want to force archiving of errorlogs. Any help greatly appreciated.
It's been some time since I've written any SQL so I apologize if the answer to my question is obvious.
In pseudo-code here's what I want to do:
delete from table-1 all rows where the table-1.id = table-2.id and table-1.text = ""
Thanks in advance.
does anyone know how to clear the sql "connect to server" popup server name list
View 13 Replies View RelatedHello guys!
I would like to clear the logfile. Could anybody tell me how to do this?
What I would like most would be to run SQL-Server without any log-file (while development). But I suppose that this is not possible.
Regards,
Fabian
my favorit hoster is ASPnix : www.aspnix.com !
Hi, my database i am working on is full of crab, who do I clear all the tables info?
View 3 Replies View Relatedwhat is the command using to clear the content of log file
View 2 Replies View Relatedselect *From titles(18 row(s) affected)Totally 18 records are there in Titles table.When I queryselect title,title_id From titles where title like 'T%' and title_idlike 'M%'It is returning 2 records.So,now if I introduce a not in 2 places also it should return 16records.Whereas it is returning 14 records. What is the bestway to understandthis.select title,title_id From titles where title not like 'T%' andtitle_id not like 'M%'ThanksGanesh
View 2 Replies View RelatedI have a dataBase named pricesDB. I would like to clear all the prices column everyday at midnight.
How should i do that???
When I backup a my transaction log and then run DBCC SQLPERF(logspace) the log shows 12% space used. The backup was run at night long after any transactions had been executed so there should be no active transactions. In SQL 6.5 you could run DBCC CHECKTABLE(syslogs) to clear up the usage inaccuracy is there a similar command in 7.0 to fix the space usage inaccuracy?
--Buddy
I practiced log shipping in my home PC. It works fine. But there are 3 error dialog box populated for every 15 minutes. I enclosed screen shot.
1. DW20.Exe Application Error
2. Visual Studio just-in-Time Debugger
3. Sqllogship.exe Application Error
I got this error every 15 minutes. I delete everything such as maintenance plan jobs, replication, log shipping, mirroring in my SSMS. I can't find out the solution for this error. I didn't know, how to resolve this problem.
Please advice. :eek:
Thanks
Jayasri
Hi is there a way of clearing the server names from the management studio?
i found the below on the net but i do not have this file to delete?
“All you have to do is delete C:Documents and Settings<user>Application DataMicrosoftMicrosoft SQL
Server90ToolsShellmru.dat.�
What is the best way to empty out a table to reset its identity field back to 1?
I was going to do "Generate SQL Script" for all the tables I wanted to reset and then drop and re-create each table. Is there a better way to empty out all of your tables?
hi
I would like to clear all data in a table called ... How do I do that - and before I do it I'd like the data copied to a another table as a backup .... Please guide me .....
Thanks in advance .....
Hi
How to clear the Transaction Log of Tempdb?(Other than Restarting the SQL server)
Thanks in Advance
Regards
Magesh
Hi,
I had deleted the login and user in my SQL 2005 database. However, each time when i connect to my database using the SQL enterprise manager, I can still see the deleted username under the login. It seems that the username is stored or cache somewhere after the first time that I have login. Does anyone know how to clear it? I am using SQL 2005 authenication method on 2003 Server machine. Thanks.
Regards,
Environment1)We are using VBA,MS Access 2000/2003 and SQL Server 2000 in ourproject.2)We need to use Rational clear case as the SCM tool.Our WorkOur work primarily falls in developing SQL Server stored procedures,functions and few VisualBasicForAccess(VBA) code.Technical Help sought1) Does SQL Server 2000 provide any inbuilt capabilities of SoftwareConfiguration Management(SCM)?Not that I am aware of other thanextending it with other DM management tools like BMC,A&G,VERITAS etc.2)If not, Is there any plug-in available in SQL Server environment thatcan be installed on SQL Server so that any code developed [Storedprocedures/functions etc] can be managed in Clearcase.[I am looking forEclipse plugin's kind of plugins which would enable you to check in andcheck out from Eclipse after the initial configuration is done onEclipse]?3)If plugins are not available then the option we have is, manual andexternal check in and check out the code bits in to Clearcase.Can someone point me to concise and relevant user manual on this.
View 2 Replies View RelatedIs there a simple method to clear all the tables in a db or to make a copy of the mdf file without the datas ?
I tried to use TRUNCATE TABLE but it doesn't work with foreign keys ?
Thanks.
We want to back up our test db (new application) and then put it back on the box. The transaction log is pretty full (600mb), can I clear this file or delete the data in it -- we do not need it since this is all testing data.
Thanks,
anke
I'm writing a web application that saves data to a Microsoft SQL database. As I build my application, I continually dirty my database with test data and refine my data schema. Is there a tool that can quickly remove all of the data from 4 of my 5 tables? Right now I'm using MS SQL Server Management Studio Express to open each table and manually deleting the rows of data and it's a pain in the ass. Playing around with the Management Express, I was able to generate a create SQL script (I'm afraid to test it though) that looks like it will rebuild my table. The problem is, one of my tables is a list (index?) of types...and I'd need that data saved
ebuilt each time...but I cannot figure out how to tell SQL that the rows in this table needs to be rebuilt (and is not really data per say).How do you guys "clear" or reset your database during development?-=STZ=-
I have an application that allows users to "reserve" a certain time and location for practice sessions. I want them to look at a web form that shows which times are available and then allows them to select an open slot and then submit this form with some personal information. My problem is that as soon as they select an open slot, other users should see that this slot is no longer available. On the other hand, if someone selects an open slot and then takes too long to type in their personal information, I want it somehow to kick them out and re-open this slot back up.
I know that I can create a field called 'status' in my database that gets turn to something like 'pending' as soon as the first user clicks on an open slot, but how would I turn this field back to the 'open' state if the user took too long to enter their data?
Any help would be surely appreciated.
Cheers,
AzF
how i can clear sql server logs by run xp_cmdshell stored procedure.
(my user in sql server is a admin).
i don't want use enterprise manager . i want write a query and use at xp_cmdshell .
befor thx.
how do I clear sql 7 logs they are full and I am stuck?
thanks you