Cache Invalidation
May 8, 2007
Hello,
Am wondering if someone can give me a pointer on where to start with a query i have.
What i am trying to do is provide some sort of information to a user that data from a database has been changed. I know that you can cache a page and have output cache directive invalidate it next time it loads if changed but wondering if its poss to be told its changed without reload ( dont see how but never know) - even if not on that page.
What im kinda thinking is something like the popup that outlook has when a new message arrives in in box. Is that just sending a new query? is there a table last modified function in sql? etc.
This is for a web app in c#.
Any help would be appreaciated.
cheers
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Jun 5, 2007
Hi I am using SQL Server cache invalidation with caching in my application.
I have a master page and several other pages that are referring the master page.
I have specified :
<%@ OutputCache Duration="60" VaryByParam="*" SqlDependency="CommandNotification" %> on one of my content page.and I have included the
System.Data.SqlClient.SqlDependency.Start(connectionstring) in my Application_Start.My web.config contains this section as well -
<caching><sqlCacheDependency enabled="true">
<databases><add name="BizPartnerV4" connectionStringName="BizPartnerConnectionString"/>
<add name="DirectBuyBeaverton" connectionStringName="DirectBuyBeavertonConnectionString"/></databases>
</sqlCacheDependency>
I</caching> have also run the aspnet_regsql utility to enable sqlcache dependency for the database.
But my page is not taking the values from cache when the page is refreshed.
Please help.
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May 22, 2008
If I simply want a db table to have caching enabled and just care about the application getting that data from the cache instead of physically getting it from the table (no need for me to have a delegate for notification), there is no need for me to create a sqldependency object within my middle tier method associated with my command, correct? I have the sql cache enabled for a particular db table and have the following in my Application_Start event of the global.asox file (SqlDependency.Start “connectionstring�) Once I change something in the table, the cache is invalidated. That’s all I need, correct?
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May 24, 2007
Hi,
I am not sure is this is .NET issue or a problem with the SQL Service broker so i hope you can either point me in the right direction or make suggestions to solve this problem.
I am using the SQL Server 2005 service broker to manage my caching in an ASP.NET application. The service broker is started with all require queues and permissions set up for the service account that connects to SQL Server. The application + broker service works fine in that if a table row change is made to a registered query the cache will invalidate in the web application.
The problem i am getting is errors appear in the application event log as well as the SQL logs and i am not sure what it means or why it is throwing an error even though the application works as it was designed.
Below are a couple of errors that are being logged
The query notification dialog on conversation handle '{ADC34B70-BD09-DC11-AFEA-0016E6539AEB}.' closed due to the following error: '<?xml version="1.0"?><Error xmlns="http://schemas.microsoft.com/SQL/ServiceBroker/Error"><Code>-8470</Code><Description>Remote service has been dropped.</Description></Error>'.
The query notification dialog on conversation handle '{E8642B09-BB09-DC11-AFEA-0016E6539AEB}.' closed due to the following error: '<?xml version="1.0"?><Error xmlns="http://schemas.microsoft.com/SQL/ServiceBroker/Error"><Code>-8490</Code><Description>Cannot find the remote service 'SqlQueryNotificationService-f19bedef-a9f9-46e1-8f37-1b573614bd26' because it does not exist.</Description></Error>'.
Service Broker needs to access the master key in the database 'test'. Error code:25. The master key has to exist and the service master key encryption is required.
Thanks for your help.
Jim
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Jan 6, 2006
I'm trying to set enable SQL cache invalidation on a webpage, specifically on a a datasource that fills a GridView.
The website http://beta.asp.net/QUICKSTART/aspnet/doc/caching/SQLInvalidation.aspx makes it sound so very simple, and I have attempted to do all that it says, yet something just isn't right. The site says that the following needs to be done.
Queries must explicitly include column names in the SELECT statement. Using "SELECT *" results in a query that will not be registered with Sql Server 2005 query notifications.
Table names in queries must include the ownername. For example, if you issue a query against the authors table in the pubs database, the query must reference the table as "dbo.authors".
The security identity running the query must have rights to register queries for notification in Sql Server 2005. This right can be granted with the following T-SQL command: GRANT SUBSCRIBE QUERY NOTIFICATIONS TO username.
The security identity running the query must also have rights to send query notifications from Sql Server 2005. This right can be granted with the following T-SQL command: GRANT SEND ON SERVICE::SqlQueryNotificationService TO username.
I've done items 1,2 & 3, but when I attempt to do item 4 I get the following result in TSql:
Msg 15151, Level 16, State 1, Line 1
Cannot find the service 'SqlQueryNotificationService', because it does not exist or you do not have permission.
My login account has sysadmin priviledges, so I'm guessing the latter part of the error doesn't apply to me. But what do I have to do to get SqlQueryNoticationService to exist?
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Dec 19, 2005
I was wondering if SQL Cache Dependency would be in fact invalidated if:
1. it was created based on a procedure type command.
2. if the select statement retrieves the data from multiple database tables
Any help would be more appreciated. I am stuck with the fact that none of the data bases on sql dependency is invalidated. I spent literally hours to understand what i am doing incorrectly.
Thanks
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Mar 31, 2006
I have used the notification-based cache invalidation with my web application, but how can I check it really works? I mena if the backend data didn't change , the data will come from cache not from the database?
<asp:SqlDataSource ID="SqlDataSource_WebInfo" runat="server" ConnectionString="<%$ ConnectionStrings:LocalSqlServer %>" SelectCommand="SELECT simplified, traditional FROM temp" ProviderName="System.Data.SqlClient" EnableCaching="True" SqlCacheDependency="CommandNotification">
</asp:SqlDataSource>
Thanks a lot!
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Dec 27, 2007
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....
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May 31, 2007
Is there a way to drop clean buffers at the database level instead of the server/instance level like the undocumented €śDBCC FLUSHPROCINDB (@dbid)€??
Is there a workaround for €śdbo€? to be able to flush procedure and data cache without being elevated to €śsysadmin€? server role?
PS: I am aware of the sp_recompile option that can be used to invalidate cached execution plans.
Thx.
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Feb 15, 2008
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?
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Mar 13, 2003
On 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.
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Jul 12, 2006
I read about the SQL 2005 Buffer Cache and the .NET cache.I tried it on about 8000 users query. Both are fast....SQL 2005 being a little faster (probably due to I was sorting the .NET Cache).Any comments?
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Jul 9, 2002
Hi there,
We have cluster server and we are using sql server 7, everything was working fine on node a and when we move to node b and run the job from the jobs it gives the error message:
Error 22022:SQLServerAgent Error: job ox7bb7d7bf23b8974d8ea8f15e43e854cf
does not exist in the job cache
Can anyone help on this.
Thanks in advance.
Madhu.
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Dec 3, 2001
In Sybase, I can bind a database or table to cache, can I do the same
on SQL 7.0?
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Sep 9, 2005
Hi..
I don't know this is possible or not.
for example.. I have a blog site..
my entry links are like that
blog.asp?ID=33
blog.asp?ID=36
36 points "select * tbl where id=36"
And approximately BLOG #36 has 400 views everyday..
content is same.It never change..
Everyday my application performs "select * tbl where id=36"
with direct ASP or Stored Procedure..
Do you have any solution about this ?
How to improve performance..
Just imagine, If entry #36 had 2.000 views everyday ?
just example..
Of course the less perform query, the more performance..
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Mar 14, 2008
Hello!
When I create new job, I get a message "Job cache 97% full"
What should I do? And what IS a job cache?
Thanks!
Makkaramestari
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Apr 25, 2007
Hi all,
I have a question regarding SQL caching.
I want to use SQL caching for my pages.I've gone through http://msdn2.microsoft.com/en-us/library/e3w8402y(VS.80).aspx article on msdn, where in step by step procedure is explained for this. But I have a slightly different situation. In the article, we need to configure our application from web.config by following...
<!-- caching section group --><caching> <sqlCacheDependency enabled = "true" pollTime = "1000" > <databases> <add name="Northwind" connectionStringName="NorthwindConnectionString1" pollTime = "1000" /> </databases> </sqlCacheDependency></caching>
Where in "NorthwindConnectionString1" is the SQLdatasource connection string. But I'm not using SQLDatasource, and have my own classes to build a connection datasource and get a dataset, and then bind it to my control.So in this case what should I write for the above "connectionstring" attribute. My connection string is in web.config only with a section defined. and in my application i'm reading from web.fing only.The connection section i'm using is as follows...
<ConnSettings>
<add key="ConnString" value="server=serverName;database=dbName;uid=dbuser;Pwd=password"/>
</ConnSettings>
I want to know how to configure my sql cache in this situation.
Thanks,
Mehul Mistry
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May 31, 2007
Hello all.. i'm having a major issue with my Sql Express 2005 database :(
I'm using wicked code sitemap to allows for a sitemap to be stored in a database.. it uses sql cache dependency to invalidated the cache bla bla
Problem:
After i update a record / add new record the database generates a SqlQueryNotificationStoredProcedure
But it never gets executed. I've done tests on the code it's calling everything accordingly so i'm assuming the problem lies in a configuration setting of the database
done alot of searching around the net and i've found this
GRANT SUBSCRIBE QUERY NOTIFICATIONS TO username
i'm using Windows Authentication how do i run this and will this solve the problem
Thank you in advance
Chris
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Feb 8, 2008
I'm working off of the example shown here:
http://www.c-sharpcorner.com/UploadFile/mosessaur/sqlcachedependency01292006135138PM/sqlcachedependency.aspx?ArticleID=3caa7d32-dce0-44dc-8769-77f8448e76bc
The tutorial shows that an entry must be made in web.config for a sqlCacheDependency node in web.config. When a dependency is added, they set an attributed called "connectionStringName" that references a connectionString established earlier in the web.config. My question is twofold:
1). First, I tried setting up my connection string using the connectionStrings node (my other apps use the AppSettings node), but when I try to extract the value in my code using the following syntax:
connStr = Convert.ToString(System.Configuration.ConfigurationManager.ConnectionStrings["devConnStr"].ConnectionString);
I get the following compilation error: "ConfigurationManager does not exist in the class or namespace System.Configuration";
Am I extracting it with the wrong code? Does that setup exists in .NET v 1.4? No, I cannot use .NET v 2.0 for various reasons.
2). If I cannot use ConnectionStrings in that way and must use AppSettings, how do I set up SqlCacheDependency node to recognize that connection string?
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Sep 18, 2000
I have been seeing this strange statistics in one of our servers. The cache hit ratio has gone beyond 100%, it is currently showing 124%. Has anyone seen this before.
Thanks
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Nov 1, 1999
I know this might be a dumb one, but what the heck. My new 7.0 server's procedure cache
stays at 100%. After researching this looks like what I want. Nay response appreciated.
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Sep 30, 1999
Help, have recently upgraded from 6.5 to 7.0 and have come across a problem with performance. The problem appears to relate to the buffer cache being flushed, the buffer cache hit ratio drops from 98% to 0% in a matter of a second. It then very slowly grows, then is flushed again, then increase slowly upto 30%.
Does any one have any ideas as to what would flush the buffer cache?
Any comments would be much appreciated - cheers
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Aug 16, 2000
Hi,
I was wondering if anyone knew where I could find good information on performing a database cache. I want to cache tables and run queries from them within a Cold Fusion Application.
Thanks.
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Mar 18, 2005
I have a large dell server with 4 processors, and 8 gig of memory on win 2000 advanced with sql 2000 enterprise edition running a 3rd party app. My cache hit ratio averages about 76%. I thought the gneral rule was if you get below 80% to add more memory. However my memory manager shows I am only using 71% of my memory and have a full gig available. I have the sql server set to use about 7.1 gig of the 8 gig on the server. My ? is if I am only using 71% of my memory, will will adding more memory actually help my cache hit ratio
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Jul 28, 1999
Ours is a MSSQL Server Client server application with very minimal usage of Store procedures.
The proc cache is configured at 5%.I execute "dbcc proccache" to keep track of the proc cache.
I have seen that the "proc cache size" reduces to a very small a amount when there is peak usage.
It starts at 42,000 and comes down to 400, though it is always greater than "proc cache used".
I am worried if this causes crashes.
Please advise why this happens and solutions if any.
Thanks in advance,
Ramakrishna seelam.
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Feb 11, 1999
Hello folks!
We are going to install SQL server 6.5 with MSMQ.
And set 128M memory for SQL Server.
What % Procedure cach do you recomend to set?
Thanks,
Alona
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May 31, 1999
I am doing performance testing and I would like to be able to flush the data cache without re-starting the server. Can this be done?
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Jul 9, 2002
Hello,
Can u put table in cache in MS SQL Server?
Thanks
Rea
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Jun 29, 1999
I have a server where the cache hit ratio averages 99.5%, however the cache flushes figure is high at 13068 over half a day, the avg free page scan is 122, both above what microsoft reccomend.
The server has 320Mb memory of which 272 is allocated to SQL Server.
Of the 272, 229.9 is allocated to the data cache.
I would be grateful of any suggestions to improve the situtaion
Thanks in advance
Tom Willetts
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Oct 30, 2001
Microsoft recommends a 1MB L2 processor cache for SQL2000. I only have a 256K cache. What is the impact and what can I do, other than replace my procs, to compensate.
Thanks in advance.
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Dec 2, 2004
We recently moved a database to the SAN and it is not performing so well. Watching performance logs I have noticed that the Cache hit ratio is only around 60%. I checked memory right away and that seems to be fine. Plenty of physical memory available and only about 40% is committed to use.
The SAN is currently configured to have 200 mg of Read Cache, I would imagine that is a little low, but not sure.
This is the first time we have ever put a database on the SAN so our knowledge of optimization is lacking. Any ideas on how to improve performance would be helpful.
Thanks much
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Dec 14, 2006
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
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Apr 2, 2004
I'm very confused about which dbms to use. I've two choices: MS SQL Server 2000 and Intersystems Cache. Although Cache is post relational I don't know anything about it. However it has object oriented features, I know how to do things in SQL Server.
Can anyone give me the advantages and disadvantages of both systems in this situation?
Thanks in advance.
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