SqlDependancy OnChange Event Triggers Over And Over Again
Mar 29, 2007
I have an sql dependancy setup on a particular table that is not updated all that often. When I load my application that has the dependancy code in it, the onChange event of the SqlDependancy fires over and over again non stop. I am positive I am not updating the information in the table I am querying so I can not figure out why it would do that. But I bet one of you knows! If you need code I can supply it and if you need anything else let me know. Thanks in advance.
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Feb 7, 2007
I've wrote a component that take advantage of the query notification macjanizm, i use this component in a web service , and its working great, with a little problem , i have imporsonation enabled in my web service and a user and password is set in the identity node in web.config , the impersonation is working great and the web service is running under the user name i've set in the web.config , but, when i change a table in the database and the change event is raised in my application the user name is no more the user in the web.config...The user is now ASPNET ....
How can i solve this problem of user name change?
Thanks in advance ,
Eden
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Mar 27, 2008
I am using the SqlDependency to notify me of data changes in a table. However, as soon as I start it, the OnChange event fires over and over even though no data has changed.
Essentially All I want to do is be notified when records are inserted into a table. I am able to get another example to work using a Service Broker Queue and a sql query of WAITFOR ( RECEIVE CONVERT(int, message_body) AS msg FROM QueueMailReceiveQueue ) However I would prefer not to use a queue for once my messages have been read they are taken off the queue and I would rather control that manually.
Any help with getting SqlDependency to notify my app when records are added and not over and over when the data has changed would be great.
Here is my code:
Code Snippet
public partial class Form1 : Form {
public static event OnChangeEventHandler OnChange;
string _strConnString = "Data Source=localhost;Integrated Security=SSPI;Initial Catalog=email_queue;Pooling=False;";
string _strSql = "SELECT email_id from email where isprocessed = 0";
private DataSet dataToWatch = null;
private SqlConnection connection = null;
private SqlCommand command = null;
SqlDependency dependency = null;
SqlDataReader sdr = null;
public Form1() {
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e) {
SqlDependency.Stop(_strConnString);
SqlDependency.Start(_strConnString);
if (connection == null) {
connection = new SqlConnection(_strConnString);
connection.Open();
}
if (command == null) {
command = new SqlCommand(_strSql, connection);
}
if (dataToWatch == null) {
dataToWatch = new DataSet();
}
GetData();
}
private void GetData() {
dataToWatch.Clear();
command.Notification = null;
dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
command.CommandTimeout = 400;
using (SqlDataAdapter adapter = new SqlDataAdapter(command)) {
adapter.Fill(dataToWatch, "email");
}
}
private void dependency_OnChange(object sender, SqlNotificationEventArgs e) {
ISynchronizeInvoke i = (ISynchronizeInvoke)this;
if (i.InvokeRequired) {
OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);
object[] args = { sender, e };
i.BeginInvoke(tempDelegate, args);
return;
}
dependency = (SqlDependency)sender;
dependency.OnChange -= dependency_OnChange;
this.Text = DateTime.Now.ToString();
GetData();
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e) {
SqlDependency.Stop(_strConnString);
if (connection != null) {
connection.Close();
}
}
}
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Jul 24, 2006
Hi, I have several independent, system components that write auditevents to a database locally via ODBC and remotely via TCP, and I havea requirement to audit when the database is available for modification.First, does SQL Server have a concept of starting/stopping specificdatabase instances? Or does my database instance "stop" only when theNT service MSSQLSERVER stops?Second, Oracle has system event triggers, e.g. AFTER STARTUP, but Ican't find an equivalent in SQL Server 2000. What alternatives arethere?Note that I can't rely on the MSSQLSERVER start/stop events in the NTApplication Event log, as the events need to be inserted "in-band" intomy database's event table.TIA,Josh
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Mar 6, 2008
Is the SQLDependancy Class supported in SQL Server Express? I have code that is working that uses the SQLDependancy and SQL Server Express but I have seen many post around the internet saying that this feature is not supported. I do not want to use this feature to later find out that a service back breaks it or that Microsoft will not do support for it.
Thanks Jon
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Jan 4, 2008
Hi,
I have a windows application in C# that pretty much is a copy of the example found in http://msdn2.microsoft.com/en-us/library/a52dhwx7.aspx although I am using a different database.
My problem is that the SqlDependency event OnChange is firing all the time although on insert, update or delete is performed in the database. The event fires approximately 1000times in one minute!
Does anyone have a solution to this problem?
Thanks
/Jonas Djurback
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Oct 20, 2006
After many problems with permissions I have got got SQL to accept a notification request but the public static void OnChange(object sender, SqlNotificationEventArgs e) is never triggered. The notification registers and de-registers ok. The same connect string successfuly connects to the same database to process queries.
I can see the GUID suffixed stored procedure, queue and service being created. Where does SQL2005 store the address/name of the routine it is to trigger? (When the notification is cancelled, the guid-siffixed items disappear) I have looked at the generated stored procedure, queue and service, but there is no indication of what is to be called back.
I have followed the instructions at http://msdn2.microsoft.com/en-us/library/ms181122.aspx, but so far without avail. I have checked the Application and system event logs, but there is indication therein. Also the SQL log.
So my questions are:
1) Where is the callback stored (is it a pointer or an actual name) ?
2) What steps should I take to resolve this?
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Aug 2, 2006
I am running
ALTER DATABASE dbname SET ENABLE_BROKER
on my app startup and then SqlDependency.Start(), and then the following code
SqlCommand cmd = con.CreateCommand();
cmd.CommandText = "SELECT request_queue.track_id, track.file_name, track.track_number, track.track_name, " +
"artist.artist_id, album.album_id, artist.artist_name, album.album_name " +
"FROM dbo.request_queue INNER JOIN track on request_queue.track_id=track.track_id " +
"inner join artist on track.artist_id=artist.artist_id " +
"inner join album on track.album_id=album.album_id";
cmd.CommandType = CommandType.Text;
if (con.State != ConnectionState.Open)
con.Open();
dep = new SqlDependency(cmd);
dep.OnChange += new OnChangeEventHandler(dep_OnChange);
SqlDataReader rdr = cmd.ExecuteReader();
List<Track> l = new List<Track>();
while (rdr.Read())
{
Track t = new Track();
t.TrackID = (int)rdr["track_id"];
t.Filename = (string)rdr["file_name"];
if (rdr["track_name"] != DBNull.Value)
t.TrackName = (string)rdr["track_name"];
t.TrackNumber = (int)rdr["track_number"];
l.Add(t);
}
rdr.Close();
and for some reason, after i do multiple changes to the request_queue table, (adding rows), the dep_on_change never fires, and if i check dep.HasChanges it is always false.
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Jul 17, 2007
Hi all,
I am investigating using Query Notifications - a great addition BTW. I have built a test app - loosely based on MSDN example - and am running against a SQL Express 2005 server. I have the following problem:
I have start/stop buttons to enable change checking, and a hardcode query that I am using for testing. If I stop and restart I now recieve duplicate notifcations, a single change causing the OnChange event to fires twice with two different ids Repeat this and the event will fires 3 times for each change and so on.
This only happens with a running app, if I restart the app I only get a single notification so I assume I have missed a step in stopping query notifcations or reinitialisation. I have include code below:
private bool Start()
{
try
{
// Remove any existing dependency connection, then create a new one.
SqlDependency.Stop(_currentConnectionString);
if (SqlDependency.Start(_currentConnectionString))
{
if (connection == null)
{
connection = new SqlConnection(_currentConnectionString);
}
if (command == null)
{
command = new SqlCommand(_sqlQueryString, connection);
}
return (true);
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
return false;
}
private void Stop()
{
SqlDependency.Stop(_currentConnectionString);
if (command != null)
{
command.Notification = null;
command = null;
}
if (connection != null)
{
connection.Close();
connection = null;
}
}
private void GetDataSnapshot()
{
// Empty the dataset so that there is only
// one batch of data displayed.
dataToWatch.Clear();
// Make sure the command object does not already have
// a notification object associated with it.
command.Notification = null;
// Create and bind the SqlDependency object
// to the command object.
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
using (SqlDataAdapter adapter = new SqlDataAdapter(command))
{
adapter.Fill(dataToWatch, tableName);
}
}
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
// This event will occur on a thread pool thread.
// Updating the UI from a worker thread is not permitted.
// The following code checks to see if it is safe to
// update the UI.
ISynchronizeInvoke i = (ISynchronizeInvoke)this;
// If InvokeRequired returns True, the code
// is executing on a worker thread.
if (i.InvokeRequired)
{
// Create a delegate to perform the thread switch.
OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);
object[] args = { sender, e };
// Marshal the data from the worker thread
// to the UI thread.
i.BeginInvoke(tempDelegate, args);
return;
}
// Remove the handler, since it is only good
// for a single notification.
SqlDependency dependency = (SqlDependency)sender;
dependency.OnChange -= dependency_OnChange;
// At this point, the code is executing on the
// UI thread, so it is safe to update the UI.
++changeCount;
lblStatus.Text = String.Format(statusMessage, changeCount);
// Add information from the event arguments to the list box
// for debugging purposes only.
//lbChanges.Items.Clear();
lbChanges.Items.Add("+++++++++++++++++");
lbChanges.Items.Add("Id: " + dependency.Id);
lbChanges.Items.Add("Info: " + e.Info.ToString());
lbChanges.Items.Add("Source: " + e.Source.ToString());
lbChanges.Items.Add("Type: " + e.Type.ToString());
// Reload the dataset that is bound to the grid.
if (e.Info != SqlNotificationInfo.Error)
this.GetDataSnapshot();
}
Thanks, Nick
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Jun 2, 2015
Recently we migrated our environment to 2012.
We are planning to implement Xevents in all the servers in place of Trace files and everything is working fine.
Is it possible to configure Extended event to trigger a mail whenever any event (example dead lock) occurs.
I have gone through so many websites but i never find.
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Oct 25, 2011
My SQL Server 2005 SP4 on Windows 2008 R2 is flooded with the below errors:-
Date  10/25/2011 10:55:46 AM
Log  SQL Server (Current - 10/25/2011 10:55:00 AM)
Source  spid
Message
Event Tracing for Windows failed to send an event. Send failures with the same error code may not be reported in the future. Error ID: 0, Event class ID: 54, Cause: (null).
Â
Is there a way I can trace it how it is coming? When I check input buffer for these ids, it looks like it is tracing everything. All the general application DMLs are coming in these spids.
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Apr 8, 2008
I have been testing with the WMI Event Watcher Task, so that I can identify a change to a file.
The WQL is thus:
SELECT * FROM __InstanceModificationEvent within 30
WHERE targetinstance isa 'CIM_DataFile'
AND targetinstance.name = 'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Backup\AdventureWorks.bak'
This polls every 30 secs and in the SSIS Event (ActionAtEvent in the WMI Task is set to fire the SSIS Event) I have a simple script task that runs a message box).
My understanding is that the event polls every 30 s and if there is a change on the AdventureWorks.bak file then the event is triggered and the script task will run producing the message.
However, when I run the package the message is occurring every 30s, meaning the event is continually firing even though there has been NO change to the AdventureWorks.bak file.
Am I correct in my understanding of how this should work and if so why is the event firing when it should not ?
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May 31, 2007
Server 2003 SE SP1 5.2.3790 Sql Server 2000, SP 4, 8.00.2187 (latest hotfix rollup)
We fixed one issue, but it brought up another. the fix we applied stopped the ServicesActive access failure, but now we have a failure on MSSEARCH. The users this is affecting do NOT have admin rights on the machine, they are SQL developers.
We were having
Event Type: Failure Audit
Event Source: Security
Event Category: Object AccessEvent ID: 560
Date: 5/23/2007
Time: 6:27:15 AM
User: domainuser
Computer: MACHINENAME
Description:
Object Open:
Object Server: SC Manager
Object Type: SC_MANAGER OBJECT
Object Name: ServicesActive
Handle ID: -
Operation ID: {0,1623975729}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: Domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: User
Client Domain: Domain
Client Logon ID: (0x0,0x6097C608)
Accesses: READ_CONTROL
Connect to service controller
Enumerate services
Query service database lock state
Privileges: -
Restricted Sid Count: 0
Access Mask: 0x20015
Applied the following fix
http://support.microsoft.com/kb/907460/
Now we are getting
Event Type: Failure Audit
Event Source: Security
Event Category: Object Access
Event ID: 560
Date: 5/23/2007
Time: 10:51:23 AM
User: domainuser
Computer: MACHINE
Description:
Object Open:
Object Server: SC Manager
Object Type: SERVICE OBJECT
Object Name: MSSEARCH
Handle ID: -
Operation ID: {0,1627659603}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: user
Client Domain: domain
Client Logon ID: (0x0,0x60D37C1A)
Accesses: READ_CONTROL
Query service configuration information
Query status of service
Enumerate dependencies of service
Query information from service
Privileges: - Restricted Sid Count: 0 Access Mask: 0x2008D
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Nov 2, 2007
Hi all,
Can we get the event properties by using a query?
Are there any extended stored procuder to get the above?
Scenario:
>Desktop>Right Click on My Computer
>Go to Manage and click
>Expand System Tools
>Expand Event Viewer
>Application
click on one event.We can get the log info which is the manual procudure.
But now i want to get the event properties through the Query analyzer...
Any help would be great?
Thanks,
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Oct 22, 2007
We recently upgraded to SQL 2005 from SQL 2000. We have most of our issues ironed out however about every 1 minute there is a message in the Application Event log and the SQL log that states:
EVENT ID 18456 Login Failed for the users DOMAIN/ACCOUNT [CLIENT: <local machine>]
This is a state 16 message which I thought meant that the account does not have access to the default database. The account is actually the account that the SQL services run under.
Any ideas? We can't seem to figure this one out. We actually upgraded to 2005 from 2000 and had an error appear after every reboot that prevented the SQL Agent from running(This application has failed to start because GAPI32.dll was not found. Re-installing the application may fix this problem.) We did a full uninstall of SQL and reinstalled fresh and restored the databases from .bak files and that is when the EVENT ID 18546 started occuring every minute.
We don't have any SQL heavy hitters here so please be detailed with any possible solutions. That you very much for any help you can provide!
David
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May 12, 2008
This isn€™t an problem as such, it€™s more of a debate.
If a table needs a number of update triggers which do differing tasks, should these triggers be separated out or encapsulated into one all encompassing trigger. Speaking in terms of performance, it doesn€™t make much of an improvement doing either depending upon the tasks performed. I was wondering in terms of maintenance and best practice etc. My view is that if the triggers do totally differing tasks they should be a trigger each on their own.
www.handleysonline.com
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Oct 9, 2001
Hello,
Following are the two events frequently observed in the system event error log
has any body come across these errors
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2.he Open Procedure for service "MSSQLServer" in DLL "SQLCTR70.DLL" failed. Performance data for this service will not be available. Status code returned is DWORD 0.
Any soultions for the above
Nilesh
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Sep 16, 2002
I get the following message in the eventlog and I can't find any information about it.
SQL 7 sp3
Can anyone help?
Event ID: 998
Source: SQLServerProfiler
Type: Error
Category: Internal Error
Executable: I:MSSQL7innsqlservr.exe
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Source: ........srcwritelog.c
Line: 811
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Nov 6, 2007
HOW TO RESOLVE IT?
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Jun 28, 2007
I get this error in My Event Log on My WSUS server. I am running a Windows 2000 with SQL 2K SP4.
Connection to database failed. Reason=Cannot open database requested in login 'SUSDB'. Login fails. Login failed for user 'WSUSASPNET'.. Connection string: Data Source=WSUS;Initial Catalog=SUSDB;Connection Timeout=60;Application Name=WSUS SQL Connection; Trustedd_Connection=Yes;Pooling='true'; Max Pool Size = 100
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Apr 30, 2008
I have been observing repeat error logs in the Event Viewer (Appln Logs) for event ID 107
Event Type: Error
Event Source: Report Server Windows Service (MSSQLSERVER)
Event Category: Management
Event ID: 107
Date: 4/14/2008
Time: 3:22:28 AM
User: N/A
Description: Report Server Windows Service (MSSQLSERVER) cannot connect to the report server database.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
And also found an information in the error log saying that SQL Server Service started successfully immediately after this error occurred.
Is there any known root cause which makes the service restrat often ? How much is this impacting ?
Are there any methods to resolve this ?
I would be happy to get some more information on this.
Thanks.
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Oct 6, 2006
i heard somewhere that there is a time a "time event wizard" or something like that in SQL. and i like to know were can i find it. any link or answer will be really appreciated thanks.
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Apr 21, 2008
hello all,
i have a nested gridview. how do i add a SELECTING event for this datasource for my inner gridview? because i need to increase the commandtimeout. thnx.
private SqlDataSource ChildDataSource(string strCustno) { string strQRY = "Select ..."; SqlDataSource dsTemp = new SqlDataSource(); dsTemp.ConnectionString = ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString ; dsTemp.SelectCommand = strQRY; return dsTemp; }
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May 30, 2008
i need some clarification here,i changed the CommandField for 'Delete" to the template field like this and its working well with the extender .<asp:TemplateField>
<ItemTemplate><asp:LinkButton ID="lnkDelete" runat=server Text="Delete" OnCommand=onCommand_deleter CommandArgument="Deleting" CommandName="Delete" ></asp:LinkButton>
<ajax:ConfirmButtonExtender ID="cnfDelete" TargetControlID="lnkDelete" runat=server ConfirmText="Are you sure you want to delete this ?" ></ajax:ConfirmButtonExtender>
</ItemTemplate>
</asp:TemplateField>
I am confused b/c
Earlier,i was handling the delete of a gridview row under OnRowDeleting event.Now its being handled by "onCommand_deletePlayer".Then why do I still need to handle onRowDeleting event?It gave me error,when i tried to avoid it.What exactly i shud code in OnRowDeleting. I am checking something like this rightnow in onRowDeleting,but this doesn't cancel the deletion despite of raising the messageif (gridView.Rows.Count <= 1)
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Is there a way to stop the user from deleting the LAST and ONLY row from db for a given condition?thanks
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Feb 1, 2002
I tried to save an event viewer file as a .txt format file and when I open the saved file, it's not readable.
Can someone have an idea of what format should I save the event viewer file so I will be able to view it's contents?
Thanks in advance!!
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May 2, 2000
We are trying to schedule a DTS package. If we run the package when the server is logged in the job works. If we logoff the server the job fails.
We looked in the NT Event log and we get a message from the SQLServerAgent that the job failed with Event 208. If we check the job Run History in the Next Run we get message 'Date and Time is not Available'. I should mention that the DTS pachage contains some mapping to drives on the server.
Any ideas? We have been struggling with this for a long time. Thanks.
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Dec 30, 2002
Why would I get an application event viewer error when I truncate the transaction logs on my databases? All the error tells me is that i truncated the database log.
Thanks
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Jul 4, 2003
Hi,
Can anyone help me with this?
I need to run an SQL job if a specific file exists. Actually, that specific files gets created different time in different day. I need to run the job when the file arrives. Is there any way to do this in SQL? I have done this in seagate scheduler but I need to do it in SQL.
Please help!!!!!!!
Thanks.
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Feb 21, 2006
Hi,
log backup done every 5 min.
so sql server log file full of entries
"Log backed up: Database: Prices, creation date(time):...."
could loging for Log backed for db Prices be disabled ?
Thanks
Alex
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Jul 27, 1998
Hi,
We would like to capture events in our system. There seem to be
three obvious capture points for us - application, triggers, transaction
log. The latter seems to be the most attractive, since we`re looking
for a solution with minimal performance impact. In general, our
problem is similar to populating data warehouses from on-line databases.
Can anyone proffer some advice? In particular, being quite new to
SQL Server, I am not sure how difficult/possible it is to read the
transaction log in order to cull events. Some direction here would
be greatly appreciated.
Thanks,
Karl
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May 5, 1999
I want to experiment with setting the Truncate Log on Checkpoint option to True to see if this will lessen the chance of my transaction log running out of space. Before I do this I want to be sure that the Transaction Log is not tied to the NT Event Log, SQL Error Log, etc. For example, does the NT Event Log (or any other log) use the Transaction Log? Thanks, Kevin.
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May 6, 1999
I see these 4 events posted in my event log every second. I am using SQL 6.5
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The third event has "DB-LIBRARY error - General SQL Server error: Check messages from the SQL Server."
and the fourth event contains "CollectSQLPerformanceData : dbsqlsend failed "
These messages are being posted repeatedly. Could someone shed some light on this please. Thanks Sudarshan
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Aug 10, 2004
Does anyone know if there is any software available that notifies specified people when an error above a certian level occurs. Im thinking along the lines of email and text message.
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If there isn't any software, would anyone know of any scripts that will do this?
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