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Hi..
This is the question I was asked in an interview...
say.. I am executing a stored procedure as under
exec sp_temp("select * from emp")
how will i write in stored procedure to execute this query if i receive this value in one parameter say..@sql as under
create procedure sp_temp
@sql varchar(100)
as
begin
-- what would i write here to execute query in @sql
end
////////////////////////
As I didn't reply to interviewer, I want to know this....
thanks....
Hemant
By:
Hemant Thaker
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You could have written:
create procedure sp_temp
@sql varchar(100)
as
begin
exec (@sql)
end
But then I would have added that it would have been a bad design...
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I am trying to connect to a SQL-2005 Remote server through several VS-2008 applications. Two are web applications and the other is a VB.Net application. In all cases, the connection fails and the error message in the local Windows Event log is #26, suggesting that possibly the SQL server does not allow remote connections.
I know that the remote SQL server is configured correctly because I have gone through all of the steps (Surface Area Configuration, SQL Config, etc). More importantly, the connection through these applications is fine when I disable my local Windows Firewall.
On my Firewall I have created Exceptions for both SQL Server and SQL Browser. I have opened TCP port 1433 and UDP port 1434.
In all of my research, this is the extent of the solutions provided and so I am at a loss. Turning off the Firewall while debugging is a temporary solution and somewhat safe since my network is protected by a separate Firewall device, however, I would like to resolve this issue. I think there are enough developers out there having this same problem so hopefully someone has resolved it beyond the solutions I have tried.
Thanks if you can help!
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Few questions:
- tcp/ip is enabled? (firewall also blocks named pipes)
- what tcp port your sql server is listening?
- do you use dynamic ports?
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TCP/IP is enabled as well as named pipes.
According to the registry, Dynamic ports is enabled which may explain the problem. After messing with this and restarting SQL server (still using Dynamic Ports) I was able to connect. The last Dynamic Port used is 4316. The weird part is that I'm not opening port 4316 on my Firewall and yet the applications can now connect.
It seems as though I should configure the server to listen on a static port (or ports).
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Okay, here's a follow-up. The reason Dynamic IP address might have been enabled on this server is that there is also an instance of SQL-2000 running and that must have been using port 1433. I used the dynamically assigned port # that I found in the registry as the new Static port number for IPALL and restarted the SQL service. I then opened this port in my local firewall.
I can connect to the SQL server through the application. I'm not sure if I have completely solved my problem but I have opened up my understanding of the issue.
Thanks for the reply Mike. You pushed me in the right direction!
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Hampden Tech wrote: there is also an instance of SQL-2000 running and that must have been using port 1433
Dynamic ports is fine. If you have another SQL Server (the older one) in port 1433, you should open 1434 (or some other port) for tcp traffic for this SQL Server (I recall you opened udp). Also make sure that the newer SQL Server is listening on 1434. When changing the network protocols, prefer using SQL Server configuration manager in SQL Server 2005.
Hampden Tech wrote: Thanks for the reply Mike
You're welcome.
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I have an application that uses SQL Server 2005 Express at site A.
I now have users that would like to have access to this application from site B.
At site B I have a server that also has SQL Server 2005 Express.
I would like to explore the use of SQL replication technology to see if that would work for when a user connects to the database, it will pull from its respective local DB. These sites are currently connected to each other through an IPSEC tunnel through our WAN link.
Does SQL Server 2005 support Database replication?
Is it relatively easy to setup?
Can someone point me in the general direction of where I can get some step-by-step directions?
Thank you all very much,
Joey
modified on Friday, January 23, 2009 7:04 PM
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SQL Server supports replication and one-way replication is quite easy to set up. Two-way replication (merge) is much more complex (this is true for all databases).
You can read basics for replication for example here: SQL Server Replication[^]
However since you're using Express edition in all nodes, it won't be possible to setup full replication. Express Edition can only be a subscriber in replication scenarios so you would need a standard version in your setup in order to create a publisher.
For more info about different features in different editions, see: Features Supported by the Editions of SQL Server 2005[^]
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I understand. In order to get full replication I have to have at least one publishing point (which has to come from at a minimum, a standarad version of SQL) and I also have to have one subscriber. Would the DB replicate on a specfic timed interval or when it detects that there has been changes? Thank you,
Joey
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In short: on a specfic timed interval. Replication uses SQL Server Agent jobs which are executed on an interval (configurable).
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Mike, in your opinion, what type of bandwidth would we require for this type of replication to happen smoothly? The sites are linked together through an IPSec tunnel, however we are using a Cable Modem at one end (~3-5MBps down and no more than ~1MBps up) and the other end is 2 bonded T1 connections. I'm assuming that the replication will really only replicate the necessary changes, I'm just a little concerned about it becoming a bandwidth suck.
Thanks,
Joey
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Sounds like you need transactional replication. That replication works so that first a snapshot is taken from the source to get the current situation for the publication. This is delivered to subscriber(s). After that modifications to publication are gathered at the source and they are delivered to subscribers at configurable intervals.
Just a warning. This works fine when the transfer is only from source to target. If it's bi-directional so that the same data can be modified on all nodes, you will easily get into trouble because of update conflicts.
Finally to your question. The bandwith depends at least on these things:
- replication interval, the smaller the interval is, the less modifications need to be transferred
- amount of changes, how much data is changed (inserted, updated and deleted) at the source between two transfers
- characteristics of the changed data, if it is mainly numbers or dates, it requires less bandwith than for example longer varchar data not to mention BLOB data
- reliability of the connection, if the data must be sent several times, it will affect. Also it affects if the data is buffered on distributor because connection isn't available.
So as you see, it's quite impossible to give any accurate bandwith, but I believe that if you investigate those things, you'll get a clear picture on the data amounts.
Also why not build a test replication environment, replicate the actual data and use replication monitor in SQL Server and performance monitor to see what kind of amounts are transferred.
BTW, I noticed that you're new to CodeProject, welcome! Just to inform you that we have a voting system you can use if you want. Each reply can be marked good/bad and if the type of the post isn't reply, you'll see voting options in the lower right corner of the post from 1 (bad) to 5 (good). Usually these are used to indicate if the answers given to a person were helpful or not.
Mika
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hello,
i have to ask for a sql query:
scenerio:
i have two tables CHATROOMS AND MEMBERS
CHATROOMS table contain columns (ROOM_ID(pk) and ROOM_NAME)
MEMBERS table contain columns (MEMBER_ID, ROOM_ID(fk))
now i have a gridview control in which i have to display all ROOM_IDs along with members init.
like:
ROOM_ID | MEMBERS
room1 | 5
room2 | 7
room3 | 6
room5 | 2
i want a single query for it coz i am binding data to gridview using SQLDATASOURCE control in ASP.net(C#)
the query i am trying is not working!
my query is:
select count(*) as total from MEMBERS where ROOM_ID = (select ROOM_ID from CHATROOMS)
the error on this query is logical that the inner query is returning multiple rows on which the outer WHERE is bound 
please help me out i am struct in btw my project....
thanks,
tc
regards,
Sana
$@N@
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Perhaps be something like:
select c.room_id, count(*)
from chatrooms c
inner join members m
on cm.room_id = c.room_id
group by c.room_id
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Thanksalot!!!
my problem is solved now..
Allah bless youuu!
tc
regards,
Sana
$@N@
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You're welcome 
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I have populated a dataset with a dataadapter and now I want to change the values. Nothing happens.
All rows are selected
Dim tblADR_BASE As DataTable
tblADR_BASE = dsADR_BASE.Tables("ADR_BASE")
Dim rows() As DataRow = tblADR_BASE.Select()
Dim intCRNO As Integer
Dim i As Integer
For i = 0 To rows.GetUpperBound(0)
intCRNO = checkForCRNO(rows(i))
rows(i)("dsp_CRNO") = intCRNO
rows(i)("CITY_ID") = "test"
Console.WriteLine(rows(i)("dsp_CRNO"))
dsADR_BASE.AcceptChanges()
Next i
Whats weird is I can wright the supposed changes to the console, but if I actually open the table in the dataset, nothing has been changed.
Am I missing some sort of save?
Thanks
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With a quick look the code looks fine (although you don't have to call AcceptChanges on every iteration). What does the code look like where you investigate if data is changed.
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Thanks Mike,
Dim test = dsADR_BASE.HasChanges
Produces false.
I swear I had this working a week ago on a different table. I have since added fields to this table and think maybe that screwed things up. I have refreshed everything.
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It's because you call AcceptChanges in the loop. That method clears the modified flag from all rows. The idea behind AcceptChanges is that you let the rows to be modified (or inserted or updated) until you put the data to a safe place (for example database). After that the modification flags can be removed.
So in short, remove the AcceptChanges.
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Thanks, I'll give that a try.
But, I added the AcceptChanges after I ran into the issue. But I will sure give it a go.
Thing is, the tables are being restored at the moment, and I have to stay out of it. I'll post results when I can. May be Monday.
Thanks
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enipla wrote: But, I added the AcceptChanges after I ran into the issue
If that's the case, check that you don't have acceptChanges (or RejectChanges) anywhere else. When you can you can do the same HasChanges test using debugger after the loop. That way you can confirm that the dataset has been modified by your loop.
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New DB, Same result. I got rid of the only AcceptChanges. There are no RejectChanges.
It still writes to the console
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After the loop, did you test with the debugger, what's the value of dsADR_BASE.HasChanges
modified on Friday, January 23, 2009 4:38 PM
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