Flummoxed by Connection Problem

Everything was working fine until suddenly this problem appeared from
nowhere:
Boot up the pc and go into SQL Server Management Studio. The database is
present and the data can be accessed.
Go into VB2005 Express and run the project. Everything works fine.
Open Database Explorer and connect to the database and the following
happens:
1. The project no longer works and this error appears at cnn.open()
'Cannot open user default database. Login failed. Login failed for user'
2. The database is no longer available in Management Studio. It appears
but no longer has the little + sign next to it and the data is no longer
accessible. If I try and view the database properties I get this error:
Cannot show requested dialog.
ADDITIONAL INFORMATION:
Cannot show requested dialog. (Microsoft.SqlServer.Express.SqlMgmt)
An exception occurred while executing a Transact-SQL statement or batch.
(Microsoft.SqlServer.Express.ConnectionInfo)
Database 'T:\VS_DATA\NORTHWND.MDF' cannot be opened due to inaccessible
files or insufficient memory or disk space. See the SQL Server errorlog
for details. (Microsoft SQL Server, Error: 945)
The only way I can get out of this situation is to reboot my pc. I am ok
as long as I don't try and connect to the database via Database Explorer.
I have tried disconnecting from and even deleting the database in Database
Explorer to no avail. HELP!
Des
--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/I have narrowed down the sequence:
If I close the connection to the database in VB2005 Database Explorer
(very important) and then restart the server my project works again. But
as sonn as I connect vian Database Explorer it breaks again.
On Tue, 17 Jul 2007 12:32:05 +0100, DesCF <descf@.aol.com> wrote:

> Everything was working fine until suddenly this problem appeared from
> nowhere:
> Boot up the pc and go into SQL Server Management Studio. The database
> is present and the data can be accessed.
> Go into VB2005 Express and run the project. Everything works fine.
> Open Database Explorer and connect to the database and the following
> happens:
> 1. The project no longer works and this error appears at cnn.open()
> 'Cannot open user default database. Login failed. Login failed for user'
> 2. The database is no longer available in Management Studio. It appears
> but no longer has the little + sign next to it and the data is no longer
> accessible. If I try and view the database properties I get this error:
> Cannot show requested dialog.
> ADDITIONAL INFORMATION:
> Cannot show requested dialog. (Microsoft.SqlServer.Express.SqlMgmt)
> An exception occurred while executing a Transact-SQL statement or batch.
> (Microsoft.SqlServer.Express.ConnectionInfo)
> Database 'T:\VS_DATA\NORTHWND.MDF' cannot be opened due to inaccessible
> files or insufficient memory or disk space. See the SQL Server errorlog
> for details. (Microsoft SQL Server, Error: 945)
>
> The only way I can get out of this situation is to reboot my pc. I am
> ok as long as I don't try and connect to the database via Database
> Explorer. I have tried disconnecting from and even deleting the
> database in Database Explorer to no avail. HELP!
>
>
> Des
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

Fluctuate in DB Performance Statistics

Dear All,
I have noticed that the DB performance statistics is not
stable as it will rise at certain time dramatically.
I have checked that there isn't any job at that time.
E.g. Server\memory/pages , Current disk queue length,
processor time
Can any one suggest on any cause this?
Thanks.most database applications today consists of a mix of
simple transactions and complex queries that process a lot
of data. this includes reports or other sophisticated
features.
if you have for example 100 concurrent users running the
simple transactions, you might see a stable load on the
server,
however, anytime someone hits one of the complex queries,
you might see cpu spike.
this is why many people recommend separating OLTP and DSS
applications. there is no such thing as a machine powerful
enough to handle both functions on one server.
the OLTP server depends on fast response times, meaning it
should operate at low cpu loading.
the DSS app is supposed to run with cpu pegged, if not,
then you should be running more DSS queries to it, you
bought the hardware, you may as well use it.
>--Original Message--
>Dear All,
>I have noticed that the DB performance statistics is not
>stable as it will rise at certain time dramatically.
>I have checked that there isn't any job at that time.
>E.g. Server\memory/pages , Current disk queue length,
>processor time
>Can any one suggest on any cause this?
>Thanks.
>.
>|||Run profiler at that time to see if it is any TSQL commands causing this. Also, it can be the
checkpoint process.
--
Tibor Karaszi, SQL Server MVP
Archive at: http://groups.google.com/groups?oi=djq&as_ugroup=microsoft.public.sqlserver
"Jackty" <anonymous@.discussions.microsoft.com> wrote in message
news:022d01c3ad86$140683a0$a601280a@.phx.gbl...
> Dear All,
> I have noticed that the DB performance statistics is not
> stable as it will rise at certain time dramatically.
> I have checked that there isn't any job at that time.
> E.g. Server\memory/pages , Current disk queue length,
> processor time
> Can any one suggest on any cause this?
> Thanks.

Floyd's and Warshall's algorithms on relational DB schema

Hello,
I'm searching for an example of Floyd's and Warshall's algorithms in T-SQL
to find all possible paths (based on the PK - FK tables relations) in a
relational database schema (Graph).
Anyone some usefull tips?
Thanx,
Peter"PeterM" <PeterM@.discussions.microsoft.com> wrote in message
news:1914E310-C649-4A24-8B95-32DD63B625F4@.microsoft.com...
> Hello,
> I'm searching for an example of Floyd's and Warshall's algorithms in T-SQL
> to find all possible paths (based on the PK - FK tables relations) in a
> relational database schema (Graph).
> Anyone some usefull tips?
> Thanx,
> Peter
See http://tinyurl.com/49gft.
There's a recursive solution first, that you can't use with SQL Server 2000
but you can with SQL Server 2005, which is followed by an iterative solution
.
The solutions were implemented for DB2 but if you add an @. to the front of
variable names and change END WHILE to END it should be legal T-SQL.
JAG|||Peter,
Here is a link to a naive transitive closure algorithm (keep taking
powers of the adjacency matrix until you get nothing new). It might
at least help you implement Warshall's or other graph algorithms.
http://groups.google.co.uk/groups?q=kass+transclose
Steve Kass
Drew University
PeterM wrote:

>Hello,
>I'm searching for an example of Floyd's and Warshall's algorithms in T-SQL
>to find all possible paths (based on the PK - FK tables relations) in a
>relational database schema (Graph).
>Anyone some usefull tips?
>Thanx,
>Peter
>

flow of events while sending message from one serivce two another

Hello,

I want to know the exact flow of events when I use this statement:

BEGIN DIALOG CONVERSATION @.dialog_handle
FROM SERVICE [SERVICE1]
TO SERVICE 'SERVICE2'
ON CONTRACT [MainContract]

Assuming that I have defined SERVICE1 for Queue1 in the initiator ,

and I have defined SERVICE2 for queue2 on the target.

Is this the flow:

1.Message first goes to the queue1
or
it directly goes to the SERVICE2 on target end point which in turn puts this message in Queue2 on the target?

2. target queue then activates the stored procedure which is connected to queue2 (let's say the procedure name is 'Processqueue2')

3.I noticed that even when none of the item comes in the queue, still when u use "ALTER QUEUE queue2 WITH STATUS = ON", that time also the 'processqueue2' is called.

4.'processqueue2' then fetch message from queue2 and process this. optionally it can send the acknowledgement message to the initiator or just send the end dialog message.

5.if i dont want 'processqueue2' to send the acknowledgement then
can I can directly send the End dialog from the inititor it self i.e. the end dialog just after sending the message.

BEGIN DIALOG CONVERSATION @.dialog_handle
FROM SERVICE [SERVICE1]
TO SERVICE 'SERVICE2'
ON CONTRACT [MainContract]

SEND ON CONVERSATION @.dialog_handle
MESSAGE TYPE SendMessageType ('hello from intiator')

END CONVERSATION @.dialog

In this case why do i need queue1 at all?

my assumption here is that my communication is one way and i don't need the ACK from the target.

Thanks,

BEGIN DIALOG alone does not actualy send any message. It just create the initiator endpoint in sys.conversation_endpoints.

When you SEND a message, the message goes at first into sys.transmission_queue. After the SEND is commited, the message is picked up from sys.transmission_queue and delivered to he machines where SERVICE2 is hosted and is enqueued into Queue2. After the enqueue into Queue2 is commited, an ACK is automatically sent back to the host of SERVICE1 and this allows the message to be deleted from sys.transmission_queue.
In the case when SERVICE1 and SERVICE2 are within the same SQL Server instance, we might try to optimize the SEND by directly enqueueing the message into Queue2 (skip the intermediate step of sys.transmission_queue). If this optimization attempt fails for whatever reason (e.g. Queue2 is diasbled), then the normal path of sys.transmission_queue is used even within the same SQL instance (in fcat, even within the same database).

You application cannot send ACK replies, it can only send real message replies. These are ordinary messages sent from target to initiator, and they would follow the exact sequence as above.

Procedure activation (Processqueue2) happens whenever there are available (i.e. unlocked) messages in the queue. It is not a trigger, the procedure does not get activated once for each message. The algorithm that determines when to activate a new instance of the procedure (up to the max of MAX_QUEUE_READERS setting) monitors the activity of the procedure (RECEIVE statements) vs. the incomming rate of messages and determines when the procedure cannot keep up and launches a new instance of it. When you enable a queue, if there are messages in the queue, it will activate the procedure. Same goes for server start-up, database going online etc (if there are messages in the queue, it will activate the procedure).
It is not guaranteed that the activated procedure will actually find messages in the queue. The code of the procedure should always be prepared with being activated but finding the queue empty (altough we do try hard not to activate in such situations).

A one way message flow that does BEGIN DIALOG/SEND/END is at risk of running into problems if the target service suddenly starts erroring dialogs (e.g. permissions change, or service contract changes etc). Because the initiator has already ended the conversation, when the error comes back from the target it will be droped. The initiator has no way of evem knowing the error occured. A much better message exchange patttern is to BEGIN DIALOG/SEND from the initiator, RECEIVE/END from the target, then RECEIVE/END from the initiator (i.e. the target ENDs first). The initiator does not have to sit there waiting for the target to reply, the EndDialog message sent tby the target can be processed by a procedure attached to queue1. This issue is also discussed in this thread: http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=273523&SiteID=1.

HTH,
~ Remus

sql

flow layout in rs2005

I have a report that needs to show postal addresses. The address is broken down into several fields. The problem I have is some of the address parts are optional. If they are empty, I'm left with nasty gaps in the address. I'd really like next label to reclaim the space of any empty labels.

a quick example

A full address would look like this..

customer name
address line 1
address line 2
town
county
post code

if address line 2 isnt given, I get:

customer name
address line 1

town
county
post code

but I want:

customer name
address line 1
town
county
post code

Can anyone help?

Many thanks,

Paul

Anyone know? Even if the answer is "sorry, can't do that". Could really do with an answer, I think I've downloaded the entire internet over the last day trying to figure it out!

Cheers|||

Hey Paul,

Can you try this:

=Fields!Customer_Name.Value
& IIf(Len(Fields!Address_Line_1.Value) > 0, chr(10) & Fields!Address_Line_1.Value, "")
& IIf(Len(Fields!Address_Line_2.Value) > 0, chr(10) & Fields!Address_Line_2.Value, "")
& IIf(Len(Fields!Town.Value) > 0, chr(10) & Fields!Town.Value, "")
& IIf(Len(Fields!County.Value) > 0, chr(10) & Fields!County.Value, "")
& IIf(Len(Fields!Postal_Code.Value) > 0, chr(10) & Fields!Postal_Code.Value, "")

This assumes that the Customer_Name field is required, but none of the others are. If the other fields have any length, it will add the line feed, otherwise it will not. It will put the whole thing in one textbox, I'm not sure if that was a requirement.

Hope this helps.

Jarret

|||

Ahh, ok. That works!!! Completely a different answer to how I expected, I thought it would be some layout thing somewhere.

Anyway - exactly the result I was after. Thanks for taking the time to help.

Paul

flow functions ?

Hi

Does anyone know where can I find a list of flow functions valid in MDX? The list in

ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/mdxref9/html/e363722a-3e5b-40a9-a0b5-399dd2d93f6d.htm ist not complete. For example: the case when else end function is not there. I really need a switch.

Thanks!

Have you looked at this article. http://msdn2.microsoft.com/en-us/library/ms144841.aspx

It's a bit short, but should give you some general idea.

Hope that helps.

Edward.
--
This posting is provided "AS IS" with no warranties, and confers no rights.

Flow Control in stored procedures

A newbie question..

If within a stored procedure there are a list of Stored Procedure calls.

Create Procedure spTest AS

EXEC spMyActionQuery1
EXEC spMyActionQuery2
EXEC spMyActionQuery3
EXEC spMyActionQuery4

GO

Assuming each sub stored procedure executes an action query, does SQL Server ALWAYS wait for the current procedure to finish execution before proceding with the next stored procedure? I believe the answer is yes.The answer IS yes :D