SqlCacheDependency Query Notifications -- Correct Permisisons -non Dbo Owner Account
Jul 5, 2007
Hi,
I am using SqlCacheDependency with the query notifications of SQL server 2005.
It is working nicely with the dbo.owner account but not with my web user account,
so I am thinking something is wrong with the permissions.
After searching around, it seems that the main permissions to enable are these:
GRANT SUBSCRIBE QUERY NOTIFICATIONS TO theAccount
GRANT RECEIVE ON QueryNotificationErrorsQueue TO theAccount
GRANT REFERENCES on CONTRACT::[http://schemas.microsoft.com/SQL/Notifications/PostQueryNotification] to theAccount
GRANT SELECT TO theAccount.
I enabled these and it still doesn't work. When I change my table, my cache is not getting invalidations.
Does anyone know what could be going on? Or perhaps how can I trace the problem and get some clues?
thanks so much,
-tajmahal
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Dec 19, 2001
Hi everybody.
Need help with secuity
1. SQLAgent servive = domainMy_local_admin
2. Job created
Ownner: domainSQLDBA
step1
exec sp_Who2
step2
Run DTS
a)Connect to ANOTHER_SQL_SERVER USING windows authentication
b) truncate table xxx
3. Run daily every 1 hr
1. Who will run job, domainMy_local_admin or domainSQLDBA ?
2. What account will be used to connect to ANOTHER_SQL_SERVER in step2
thank you
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Aug 12, 2014
We are running SQL Server 2012 on Windows 2008 Server. I created a credential with a proxy account. In creating the credential, it asked for an Indentity and Secret. I used my windows login and password. Now, I have tested the credential and proxy account by executing a Job which calls a SSIS Package. What is the 'best practice' to use when creating a credential? Should the credential be created with another windows login, created with the same abilities as my windows login, with a non-expiring password? Should that new windows login be used as the owner of my job with the Agent?
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Feb 16, 2008
Hello, I receive this error "The SQL Server Service Broker for the current database is not enabled, and as a result query notifications are not supported. Please enable the Service Broker for this database if you wish to use notifications." I attach the database in Management Studio to query and enable the broker using the scrip below but to no avail. ALTER DATABASE DataName SET ENABLE_BROKER ‘''<<------successfulandSELECT is_broker_enabled FROM sys.databases WHERE name = 'Database name' ‘'''<<-------value is 1 Global.asax ... Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) System.Data.SqlClient.SqlDependency.Start(ConfigurationManager.ConnectionStrings("dataConnectionString1").ConnectionString) End Sub...Web.config ... <connectionStrings> <add name="dataConnectionString1" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|jbp_data.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> <add name="ASPNETDBConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient" /> </connectionStrings>... Hope you could help. cheers,imperialx
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Sep 5, 2014
Setting up a test AlwaysOn Availability Group for one database.
However, whenever I restore the database to the replica server and join it, it ends up with my user account as the owner of the database.
Obviously I do not want a user account as the database owner, but since it is read-only I cannot modify it directly. If I were able to fail the AG over to the replica, I could change the owner then, but I cannot due to business requirements. this AG is to essentially serve as a replacement to log shipping.
I tried doing the backups and restores using EXECUTE AS login = 'sa', and yet it still shows up as my user account.
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Sep 20, 2006
What are the minimum permissions needed to view a sql 2005 Database diagram? While "dbo" can create a diagram others often want to see the daigrams and I don't want to make them dbo rights!
TIA,
barkingdog
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Feb 25, 2007
I am finding conflicting information about enabling query notifications for SQL Express. One book says it can be done and shows an example but most places on MSDN claim it requires the Service Broker. I am using Management Studio for SQL Express which does not show the Service Broker while an installation with SQL Server 2005 Dev Edition does show the Service Broker.This is all very confusing. I want to be able to develop locally with SQL Express with Query Notifications and later deploy to a server which is more capable. Previously I have read that only real difference between SQL Server 2005 and SQL Express is a 2gb memory limit.How would I go about setting up Query Notifications for SQL Express? Where would I find such documentation on MSDN?
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Oct 7, 2006
When I first saw SqlCacheDependancy and Query Notifications I was really stoked. I began using these features in ASP.NET and some of this caching really sped up my site. However, I noticed some of my queries and results were not cached. This led me on a looonnnnggggg search of the internet for anything related to these topics.
Anyway, the problem is that the queries are very limited (http://msdn2.microsoft.com/en-us/library/ms181122.aspx) in what they can contain, no count(*), no top, no order by, etc etc. I understand that the reason for this may be that the Query Notifications is using some of the Indexed Views infrastructure and therefore has the same limitations. That's fine and all but caching the results of these types of queries is still very useful for a front page of a site where you want the top ten users by number of postings etc and if you use the TOP N clause to limit it to the top 10 then you lose the built in caching functionality because this query doesn't work with Query Notifications and the cache expires immediately.
Is there a way to just get notifications when the tables involved in a query changes? I don't need the granular level of the rowsets involved I just want to be notified if my table has changed so I can refresh my cached objects.
I know there is an overload for the constructor of the SqlCacheDependency class which takes the database and table names as parameters. MSDN states that this is for Sql Server 7 and 2000 but would this also work in my scenerio? I know it wouldn't be auto-magical but if I can still get pushed notifications of changes instead of polling for notifications I would believe this to be a more efficient solution.
Query Notifications are fantastic but the query limitations make real world usage a pain, it's like have a nice red sports car but finding out you can only drive it whens it is raining and then you can only make right turns.
Regards
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Jan 13, 2015
All the recommendations I see from Microsoft docs is to limit the use of Query Notifications (QNs) to notifying connected clients when changes to mostly-static reference or configuration data occur, and to keep the number of overall query forms in play and connected clients to a minimum. Any way regarding a more integral use of QNs and Service Broker from a web app to notify n-web servers (farm) of an update to data that could be updated concurrently and quite frequently, or with a system where the technique is used extensively with lots of different query forms?
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Sep 11, 2006
Hey , I encountered a problem using SqlDependency and notification services.
I€™ve created a database with tools from c# Express 2005 and attached it to the sql server express 2005. And it turned out that €˜dependency_OnChange€™ in my application is triggered each time I execute the command.ExecuteReader(); and it shouldn€™t, because the command is just the select statement of columns and rows for which I wait to be modified.
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
command.ExecuteReader();//when the program gets here dependency_OnChange is called
So I Used the example from here :
http://msdn2.microsoft.com/en-us/library/a52dhwx7.aspx
and with AdventureWorks it behaves as it should , but when I change the connection string and select statement in the example to work with MyDatabase, the problem appears again.
So there is something wrong with MyDatabase ?
The select statement I used was €œselect Name, Pass from Users where Name like €˜L%€™€?;
So theoretically this should work but it does not and I end up in an infinite loop with
dependency_OnChange called cyclically €¦
I€™d be grateful for any advice !
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Jul 19, 2007
I have a web application that sets up a query notification on a queue. Normal operation works fine, but for some reason the queue being monitored disables occasionally (even with the transaction, error message, and end dialog message) pattern set up as described in Remus' blog post. When the queue disables, everything goes insane and the transmission queue, left unchecked, fills up the transmission queue with hundreds of thousands of PostQueryNotification messages. Am I doing something wrong? What should I do to mitigate this because it IS possible that the queue might disable sometimes, and I don't want drive space eaten up on a low-end SQL Express machine, if it does. Also - second question - where is the transmission queue storing all these messages? TempDB?
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Jan 5, 2006
During install of SQL Server 2005, we can of course use a domain account or the built-in system account for running the services. I lean toward domain for obvious reaons but would like to know a +/- to each option and why I'd choose one over the other and what consequences or limitations one may encounter if I choose one over the other.
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Sep 29, 2007
DECLARE @fullname nvarchar(50)
SET @fullname =
(SELECT (OriginalName + ContentType) AS Name
FROM Files_Dyn)
INSERT
INTO Files_Dyn(FullName)
VALUES (@fullname) where username = 'user_admin'
...what is the wrong with this query..it is giving 'Incorrect syntax near the keyword 'where'. Please correct me!
thanks in advance!
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Nov 3, 2006
Is there a query/report that I can run against all our SQL servers to see who the 'owner' of each job is?
If so, can this be run in SQL Server Enterprise Manager 8, SQL Server Management Studio or Hyena?
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Mar 2, 2006
I’ve got a table called tblApplicant_Details with the following fields - Applicant_ID, Application_ID, Net_Income, Loans.
In this table I’ve got a list of people and their income details (Net_Income) and expenses (loans). In some cases there will be 2 applicants with the same application_ID.
What I need to do is select one applicant (Applicant_ID) per application (Application_ID). In the case of 2 applicants for an application, I need to select the person with the highest income (net_income - loans), if both of the applicants have the same income I want the one with the lowest Applicant_ID and if only one person applies then that person.
Below is the code I’ve been using. I’ve noticed that its not always selecting an applicant for each application. I know it’s also very long for what I am trying to do but I was hoping someone would be able to tell me how I can fix it and tidy it up a bit.
SELECT Application_ID, MIN(Applicant_ID) AS Applicant_ID
FROM (SELECT DERIVEDTBL.Application_ID, dbo.tblAPPLICANT_DETAILS.Applicant_ID
FROM (SELECT MAX(APPLICANT.Net_Income - APPLICANT.Loans) AS Income, APPLICATION.Application_ID
FROM dbo.tblAPPLICANT_DETAILS APPLICANT INNER JOIN
dbo.tblAPPLICATION_DETAILS APPLICATION ON APPLICANT.Application_ID = APPLICATION.Application_ID
GROUP BY APPLICATION.Application_ID) DERIVEDTBL INNER JOIN
dbo.tblAPPLICANT_DETAILS ON DERIVEDTBL.Application_ID = dbo.tblAPPLICANT_DETAILS.Application_ID AND
DERIVEDTBL.Income = dbo.tblAPPLICANT_DETAILS.Net_Income - Loans) DERIVEDTBL
GROUP BY Application_ID
Thanks
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Jun 2, 2008
hi!
select min(dbo.FS_ItemInventory.Bin) from
(SELECT MIN(dbo.FS_LotTrace.LotNumber),dbo.FS_ItemInventory.Bin FROM
dbo.FS_LotTrace RIGHT OUTER JOIN dbo.FS_MOHeader AS h INNER JOIN
dbo.FS_MOLine AS l ON l.MOHeaderKey = h.MOHeaderKey INNER JOIN
dbo.FS_Item AS i ON i.ItemKey = l.ItemKey INNER JOIN
dbo.FS_MOLineData ON l.MOLineKey = dbo.FS_MOLineData.MOLineKey LEFT OUTER JOIN
dbo.FS_DemandSupply AS ds ON l.MOLineKey = ds.TopLevelDemandSupplyKey LEFT OUTER JOIN
dbo.FS_ItemInventory RIGHT OUTER JOIN
dbo.FS_Item AS di ON dbo.FS_ItemInventory.ItemKey = di.ItemKey on ds.DemandItemKey = di.ItemKey on
dbo.FS_LotTrace.LotTraceKey = dbo.FS_ItemInventory.LotTraceKey
where (dbo.FS_ItemInventory.InventoryCategory!='H' or dbo.FS_ItemInventory.InventoryCategory is null) group by di.ItemNumber,dbo.FS_ItemInventory.Bin)
when i tried this query,
i get a error like
Incorrect syntax near ')'
pls provide the correct query for this.
reg,
s.srini
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Jun 2, 2008
hi!
select min(dbo.FS_ItemInventory.Bin) from
(SELECT MIN(dbo.FS_LotTrace.LotNumber),dbo.FS_ItemInventory.Bin FROM
dbo.FS_LotTrace RIGHT OUTER JOIN dbo.FS_MOHeader AS h INNER JOIN
dbo.FS_MOLine AS l ON l.MOHeaderKey = h.MOHeaderKey INNER JOIN
dbo.FS_Item AS i ON i.ItemKey = l.ItemKey INNER JOIN
dbo.FS_MOLineData ON l.MOLineKey = dbo.FS_MOLineData.MOLineKey LEFT OUTER JOIN
dbo.FS_DemandSupply AS ds ON l.MOLineKey = ds.TopLevelDemandSupplyKey LEFT OUTER JOIN
dbo.FS_ItemInventory RIGHT OUTER JOIN
dbo.FS_Item AS di ON dbo.FS_ItemInventory.ItemKey = di.ItemKey on ds.DemandItemKey = di.ItemKey on
dbo.FS_LotTrace.LotTraceKey = dbo.FS_ItemInventory.LotTraceKey
where (dbo.FS_ItemInventory.InventoryCategory!='H' or dbo.FS_ItemInventory.InventoryCategory is null) group by di.ItemNumber,dbo.FS_ItemInventory.Bin)
when i tried this query,
i get a error like
Incorrect syntax near ')'
pls provide the correct query for this.
reg,
s.srini
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Feb 6, 2006
Hello.
I am new at SQL and am using SQL server express edition and im a bit stuck! I am using ASP.NET and C# in my website which is using sql database back end.
String SQLroom = "SELECT DISTINCT RoomName FROM Room INNER JOIN RoomCalendar ON Room.RoomID = RoomCalendar.RoomID WHERE Capacity = '" + reqCapacity + "' " + " AND NOT ('" + newRoomEnd + "' <= roomStartDateTime OR '" + newRoomStart + "' >= roomEndDateTime) AND (OHP = '" + ohpYesNo + "' AND AV = '" + avYesNo + "') ";
This is my SQL string... what it is trying to do is:
find the room
where the capacity is the reqcapacity entered by user
and the startdatetime and enddatetime entered by the user are not present in the table for that room capacity
and then look at whether the user requires OHP or AV facilities, which are stored in the database as either yes or no values.
The problem i am having is with the condition in the sql query... because the user may require an OHP and not AV, but then the room returned "`could" have AV facilities, as it wouldnt make a difference to them if it was there or not, basically, the yes condition has to be satisfied.
Not sure whether i should be using AND, or OR? or a combination.
Any ideas gratefully appreciated....
Sandy
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Jan 3, 2008
1 SELECT distinct A.EAIndex,
2 A.ChainCode AS ChainCode,
3 A.JobDate,
4 C.BillerName,
5 B.BusinessCode,
6 D.ChainName,
7 A.BillBegDate,
8 A.BillEndDate,
9 A.PostDate,
10 A.BillCount,
11 A.ChAmount,
12 A.PostAmount,
13 A.ProChargeFee,
14 A.BalanceStatus AS BalanceStatus,
15 B.BillerInfoCode AS BillerInfoCode ,
16 CONVERT(varchar(10), A.BalanceDate, 112)BalanceDate,
17 A.AdjustDate,
18 C.BillerCode ,
19 (a.ChAmount- a.ProChargeFee) AS Fee,
20 E.EABillerCode, E.RelAdjustDate
21 FROM ZT_EAccount A
22 Inner Join ZT_BillerInfo B On Right('00000'+Rtrim(Ltrim(A.BillerCode)),5) = Right('00000'+Rtrim(Ltrim(B.BillerInfoCode)),5)
23 Inner Join ZT_Biller C ON B.ParentCode = C.BillerCode
24 Inner Join ZT_Chain D On A.ChainCode = D.ChainCode
25 Inner Join ZT_EAccountAdjust E ON a.EAIndex=E.EAIndex and a.BillerCode=E.BusCode
26 Where A.JobDate BETWEEN '20071001' AND '20071005' AND C.CompanyCode='533'
In line 13 I want to add a Query to make sure if ZT_BillerInfo.Rmflag = 1, if it's =1 then ProChargeFee =0if ZT_BillerInfo.RmFlag =0 , then ProChargeFee = a.ProChargeFee.I add this line �Case B.RmFlag = '1' then 0 else A.ProChargeFee 】instead of Line 13 (A.ProChargeFee)but I execute Sql I got error message on the line I have jsut modified..can you please help me to know why and how to correct it? thank you very much
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Feb 26, 2008
Hi all,
I have written a query which is not producing the correct ouput.
Please help me to solve the query issue.
my query goes like this:-
SELECT ResourceInformation.PreferredFirstName, ResourceInformation.PreferredLastName, ResourceInformation.CellPhone,
ResourceInformation.HomePhone, ResourceInformation.HomeAddressLine1, ResourceInformation.HomeAddressLine2,
ResourceInformation.HomeAddressState,ResourceInformation.HomeAddressCity,ResourceInformation.HomeAddressZIP,
ResourceInformation.HomeAddressCountry, EmploymentInformation.ArrangementType, EmploymentInformation.PracticeGroup, Projects.Recruiter,
Projects.AccountManager, Projects.TEPOApproved, Projects.BillRate, Projects.Expenses, Projects.ClientProjMgr,
Projects.ClientAddressLine1,Projects.ClientAddressLine2,Projects.ClientAddressCity,Projects.ClientAddressZIP,Projects.ClientAddressState,
Projects.ClientAddressCountry,Projects.LabourCategoryNotes, Projects.Client, Projects.EndClient, Projects.ProjectStartDate,
Projects.DrugScreenRequired, Projects.SkillSet, Projects.AribaProposal, Projects.Sourcer, Projects.ProjectEndDate, Subtier.SubtierCompany,
Subtier.SubtierContactName, Subtier.SubtierAddressLine1,Subtier.SubtierAddressLine2,Subtier.SubtierAddressCity,Subtier.SubtierAddressState,
Subtier.SubtierAddressZIP,Subtier.SubtierAddressCountry, Subtier.SubtierEmail, Subtier.SubtierPhone, Subtier.TaxID,
Subtier.SubtierVendorPassthrough, Subtier.ClientPassthrough, Compensation.PaymentTerms
FROM ResourceInformation INNER JOIN
EmploymentInformation ON ResourceInformation.ResourceID = EmploymentInformation.ResourceID CROSS JOIN
Projects CROSS JOIN
Subtier CROSS JOIN
Compensation
WHERE (Projects.EmploymentID = 23) AND (ResourceInformation.ResourceID = 23)
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Jan 3, 2008
I'm using AVG in a simple query but the results are being returned as INTEGERs and not the correct DOUBLE form.
AVG is being used on integer fields in a .mdf database eg: "SELECT AVG(intField) AS Results FROM myDB"
Thanks,
Geoff
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Nov 10, 2003
I have the following .bat file that I call to register users to my MSDE instance...
echo osql -E -S %COMPUTERNAME%OfficiumInstance -Q "sp_grantlogin '" + %COMPUTERNAME% + "ASPNET'"
echo osql -E -S %COMPUTERNAME%OfficiumInstance -d Officium -Q "sp_grantdbaccess '" + %COMPUTERNAME% + "ASPNET'"
echo osql -E -S %COMPUTERNAME%OfficiumInstance -d Officium -Q "sp_addrolemember 'db_owner', '" + %COMPUTERNAME% + "ASPNET'"
My question is how do I correctly append %COMPUTERNAME% as a string to
I have tried using + signs...
"sp_grantlogin '" + %COMPUTERNAME% + "ASPNET'"
But that doesn't work.
I have looked for .bat file tutorials on the web but can't find the correct way to do this.
Greg
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May 22, 2015
DECLARE @DBEngineLogin VARCHAR(100)
DECLARE @AgentLogin VARCHAR(100)
EXECUTE master.dbo.xp_instance_regread
@rootkey = N'HKEY_LOCAL_MACHINE',
@key = N'SYSTEMCurrentControlSetServicesMSSQLServer',
@value_name = N'ObjectName',
@value = @DBEngineLogin OUTPUT
[Code] ....
Query to get the exact servername ( do not want to use @@servername), either need to use registry to read or using DMV...
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Jul 20, 2006
I've been having trouble getting the SqlCacheDependency to work without polling (which is set up through SqlCacheDependencyAdmin or aspnet_regsql). If you check out the documentation it says things like:
Microsoft:
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Feb 1, 2007
I have a SQL 2005 database and am running the 2.0 framework. I cannot seem to enable SQL caching on the db. I'm using the command line tool as follows:
C:WINDOWSMicrosoft.NETFrameworkv2.0.50727>aspnet_regsql -S 99.99.999.999 -Uwebteam -P sa -t tblname -d dbname -et
Enabling the table for SQL cache dependency.
.An error has happened. Details of the exception:The database 'dbname' is not enabled for SQL cache notification.
To enable a database for SQL cache notification, please use the System.Web.Caching.SqlCacheDependencyAdmin.EnableNotifications method, or the command line toolaspnet_regsql. To use the tool, please run 'aspnet_regsql.exe -?' for more information.
C:WINDOWSMicrosoft.NETFrameworkv2.0.50727>
I've replaced the ip address, dbname and tblname with ficticious names for obvious reasons here in the post.
What command can I enter to enable the database for caching?
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May 21, 2007
I have implemented a caching strategy using the sqlcachedependency and sql server 2005 backend using the broker service.This works fine and well when i am connecting to the SQL Server 2005 under service account that is in the role db_owner. In a production enivironment i am reluctant to do this so i created another service account that only has execute permissions on the stored procedures.When i use this limited service account for my ASP.net web application, the broker service does not send any messages to the web app to invalid the cache. When checking the event log and SQL profiler i get errors all relating to the user not having access to the SqlQueryNotificationService queue. So i did a lot of googling and tried running the grant scripts below with no luck using this limited service account. Keep in mind everything works fine if i use an account with db_owner priviledges. These are the grants i have tried based on numerious articles GRANT CREATE PROCEDURE TO three_d_ss_loginGRANT CREATE QUEUE TO three_d_ss_loginGRANT CREATE SERVICE TO three_d_ss_loginGRANT SUBSCRIBE QUERY NOTIFICATIONS TO three_d_ss_loginGRANT RECEIVE ON QueryNotificationErrorsQueue TO three_d_ss_loginGRANT REFERENCES ON CONTRACT::[http://schemas.microsoft.com/SQL/Notifications/PostQueryNotification] TO three_d_ss_login These are the grants i have tried that does not work GRANT SEND ON SERVICE::SqlQueryNotificationService TO three_d_ss_loginGRANT RECEIVE on SqlQueryNotificationService_DefaultQueue to three_d_ss_loginCan some one suggest what i need to do to get sqlcacheddependencies to work with a sql2005 backend under a limited priviledged service account? ThanksJim
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Jun 25, 2007
Hi, I'm trying to set up a SqlCacheDependency using the Query notifications of SQL Server 2005.
I haven't even got to the point of testing the notifications part. My problem is that my DataTable is not
even getting stored in the cache when I insert it. The cache seems to be getting invalided as soon
as I add the DataTable. Here is my code:
(am trying to get a simple example working first)protected void Page_Load(object sender, EventArgs e)
{ DataTable results = (DataTable)HttpRuntime.Cache.Get("supplyFunctions");
if (results == null)
{ Response.Write("Cache Invalidated, hitting DB. TIME: " + DateTime.Now.ToString());
results = getSupplyFunctions();
}
else
{ Response.Write("got from Cache, TIME: " + DateTime.Now);
} GridView1.DataSource = results;
GridView1.DataBind();
}private DataTable getSupplyFunctions()
{ DataTable results = new DataTable(); using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString()) )
{ using (SqlCommand command = connection.CreateCommand())
{
command.CommandText = "schema.myStoredProc"; command.CommandType = CommandType.StoredProcedure;
SqlCacheDependency dependency = new SqlCacheDependency(command); SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = command; DataSet dataset = new DataSet();
adapter.Fill(dataset);
results = dataset.Tables[0];
HttpRuntime.Cache.Insert("supplyFunctions", results, dependency);
}
} return results;
}
Also, whats weird is that when I keep refreshing the page, after like 5 to 10 minutes it works, and starts caching the data.
This disturbs me-- I would like to know what is going on. I am pretty sure my stored procedure doesn't break the rules of the query notifications. Can someone help me out?!??!
Thanks!
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Sep 30, 2007
Hi all,I've been able to successfully use SQLCacheDependency and my test application is using only one database table to test SQLCacheDependency. Now, I was reading "Programming Microsoft ASP.NET 2.0" by Dino Esposito and I've couple of questions.a)-SQLCache will expire on Insert, Update and Delete queries on the database table? Am I right? b)-Right now I'm using SQLCacheDependency on one table, can I use it on more than one table ? If I can't , can you please give me some ideas on how to use SQLCacheDependency on more than one table? c)-Lastly, If large number of clients are using my application, what about the performance gains/losses if I use SQLCacheDependency? I will really appreciate your help. Thanks,Oltmans
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Oct 1, 2007
Hi All,I've successfully implemented an example of SQLCacheDependency on one database table. I was reading "Programming Microsoft ASP.NET 2.0" by Dino Esposito and I've couple of questions. I will really appreciate your help.a)-Can I use SQLCacheDependency on more than one database tables? If I can't then I will appreciate if you can give me couple of hints as to how to do this.b)-As I understand SQLCache on a table will expire if any Insert and Update SQL operations happen on that table.c)-Our software is being used by many clients. Do you think SQLCacheDependency will have some sort of performance hits?I will really appreciate any help.Thanks,Oltmans
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Oct 10, 2007
I am using SqlCacheDependency to monitor a database table for changes.
Unfortunately, it is polling the table too often and is causing
performance issues. It seems to poll at least once a second. So now I'm
trying to find a way to adjust it so that it polls about once every 10
seconds.The
code that uses the SqlCache Dependency is located in a Class Library
Project that is used by my web application project. The code is as
follows:// in the class constructorSqlDependency.Start("...some connection string");// in the body of a methodusing (SqlConnection connection = new SqlConnection("...same connection..."){ connection.Open(); SqlCommand command = connection.CreateCommand(); command.CommandText = query; SqlDependency dependency = new SqlDependency(command); dependency.OnChange += OnDepChange; SqlDataReader data = command.ExecuteReader(); // code that uses the data goes here}public void OnDepChange(object sender, SqlNotificationEventArgs e){ DoSomething();}I
did a little searching on the web and noticed that some examples showed
that you could adjust the pollTime in the web.config file:<sqlCacheDependency enabled="true" pollTime="30000"> <databases> <add name="Pubs" connectionStringName="PubsConn" /> </databases></sqlCacheDependency>However,
as I stated earlier, the code that uses the SqlCacheDependency is
located in a Class Library, so this configuration doesn't help me. Is
there a way to adjust the pollTime without getting my connection string
from the web.config?
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May 1, 2006
I can create a SqlCacheDependency, and link it to a cached item in httpcontext cache. When something change, it will remove the cached item from the cache. I think I have to redo the process when that happens - prepare sql command, create SqlCacheDependency and insert the item into cache. Now I only need a notification from my SQL when something changes in one of my table, I don;t need read anything from db, and I think I should find a way to not recreate the SqlCacheDependency object everytime?
any suggestion?
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May 3, 2006
I have some problem with ASP.NET cache, I found other people has similar problem, but I didn't find real solution.
The one bother me most is the SQLCacheDependency doesn't work stable. I insert object in cache and has SQLCacheDependency linked. After a period of time, it stopped working. That means the the object is still in cache, but change on db side doesn't remove the cache entry. I am not sure if it is ASP side or SQL side, I feel it is ASP side.
I am using 2.0 + SQL 2005.
Once the db command notification stop working, you have to restart IIS or clear all items in cache since you don't kno which one is changed.
Any suggestion?
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Sep 12, 2007
I've set up a SqlCacheDependency in my Asp.Net application, but the dependency invalidates the cache immediately every time the page is hit.
I think the problem may be with my SQL Query, but it seems to me to meet the requirements on the Special Considerations When Using Query Notifications page on MSDN. Could someone take a look at this query and tell me if I've done something wrong? Thank you.
Here's my query:
Code Snippet
USE [chameleon]
GO
SET ANSI_NULLS ON
GO
SET ANSI_PADDING ON
GO
SET ANSI_WARNINGS ON
GO
SET CONCAT_NULL_YIELDS_NULL ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET NUMERIC_ROUNDABORT OFF
GO
SET ARITHABORT ON
GO
ALTER PROCEDURE [dbo].[usp_customers_by_site_id]
@site_id INT
AS
SELECT
customers.customer_id,
customers.name,
customers.po_prefix,
customers.dt_created,
customers.created_by AS auid,
customers.po_required
FROM dbo.customers
WHERE customers.site_id = @site_id
AND customers.is_active = 1
and here's the code in my Asp.Net site where I try to use the SqlCacheDependency:
Code Snippet
public List<Customer> GetCustomersBySite(int siteID)
{
List<Customer> customers = new List<Customer>();
if (HttpRuntime.Cache["CustomersBySite" + siteID] != null){
customers = (List<Customer>)HttpRuntime.Cache["CustomersBySite" + siteID];
}
else
{
using (SqlCommand command = new SqlCommand("usp_customers_by_site_id", Connection)){
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add("@site_id", SqlDbType.Int).Value = GetDBValue(siteID, false);
SqlCacheDependency dependency = new SqlCacheDependency(command);
try{
Connection.Open();
SqlDataReader reader;
reader = command.ExecuteReader(CommandBehavior.SingleResult);
while (reader.Read()){
customers.Add(PopulateCustomer(reader));
}
HttpRuntime.Cache.Insert("CustomersBySite" + siteID, customers, dependency, DateTime.Now.AddMinutes(Configuration.CacheDuration), System.Web.Caching.Cache.NoSlidingExpiration);
}
finally{
Connection.Close();
}
}
}
return customers;
}
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