Move A Site From Moss 2007 To Sharepoint 2010

Question

i have a site in sharepoint 2007 and i want to move it to a sharepoint 2010 server
not too sure what is the best method to do this ?
thanks

Answer 1

I landed in this thread because I had a similar need to Muthuvel's. I am wanting to bring over just one subsite out of several.  My database in 2007 is around 7GB, and all I really want is just one site out of the many in it. 
Ahmed's Ammar's steps were just right, and worked well for me in order to get the complete 7GB database over to SharePoint 2010, and later export\import that single site I was looking for.
For Muthuvel, here are my updated steps, starting with Ahmed's text (sorry for plagiarizing!).  Steps 7 and 9 are for subsites.  See links at the bottom for dealing with site collections.
1) Find the content Database;  These are listed under Central Admin->Application Management->Site Collection List
2) Backup the content database. Just doing a backup in SQL Server Management studio.
3) Restore content database to the new server, I mean the DB server for your SP2010
Copy the BAK file to new server. Create an empty DB in Management Studio, restore from backup, you may need to change an option in the "options" tab of the restore dialog to get it to work. (Overwrite db).
4) Create a new Web App on SharePoint 2010
For Step 4, I created a new Web App, choosing to create it with a suggested port number, such as 4072.  This was a temporary web application that I ended up deleting later.
5) Remove Content Database from the new web app.
I didn't find that you neeed to remove the Content Database first.  You can add the content database by Central Admin or by STSADM, or by Powershell. 
Central Admin would be Application Management > Web Applications > Manage Content DAtabases > Set the web application to your newly created web app > Add Content Database > specify the name of the database you just restored
STSADM is as Ahmed gave: 
Now use STSADM to add restored DB to this web app
c:\program files\common files\microsoft shared\web server extentions\14\bin on new server is where you can find the STSADM.
run this command from there. Which will upgrade the content db to 2010?
stsadm -o addcontentdb -url http://yourwebapp:port -databasename yourcontentdb -databaseserver yoursqlserver
Powershell would be this command below.  Be sure to run the "SharePoint 2010 Management Powershell" console, found under Programs\SharePoint 2010 Products.  If you run just regular powershell this won't work. 
Mount-SPContentDatabase "MyDatabase" -DatabaseServer "MyServer" -WebApplication
http://sitename:port
6) Run ISSRESET from command prompt
I'm not sure this was necessary, but I did it anyway.
NOW, the rest of the part about getting that subsite you want. 
7)  Export the subsite.  I did this with Powershell.
Export-SPWeb http://sitename:port/sites/subsitename –Path "subsitename.cmp"
8)  Create a new site for you to import this subsite into, in the Web Application where you want it to go.  This would be done with the regular Site Actions > New Site command.  You can also do it from Powershell, but that requires knowing
site templates by name, something I'm just learning myself.  The other thing here is that you have to create the subsite using the same template as the site you just exported.  So if that was a Team site, be sure to use a team site when you create
this new area.
9)  Import the subsite to where you want it to land permanently. Here I'm saying port 80 because that's the requirement Muthuvel mentioned.
Import-SPWeb http://sitename:80 –Path "subsitename.cmp" -Overwrite
10) Even after things say they are done on the server, the site may take an extra minute or two to come up when testing from a client.  Give it a little time. Once it comes up, somehow I found a way to change the visual appearance from the old SharePoint
2007 to SharePoint 2010, but now that I flipped that switch, I can't find the option again.  So I'm sorry that I am not documenting that here.
11) Delete that temporary web app you created in step 4.  Again you can do this with Central Admin or Powershell.  Here's the Central Admin way:
Central Admin would be Application Management > Web Applications > Manage Web Applications, land on the temporary web app, click Delete.  Choose Yes to deleting the content database and the IIS web site. 
GROAN!! I'm sorry, I just wrote all this out and realized Muthuvel was asking about a site collection, not a subsite.  Then for Steps 7 and 9 you'd want to use
Backup-SPSite 
http://technet.microsoft.com/en-us/library/ee748617.aspx
and
Restore-SPSite 
http://technet.microsoft.com/en-us/library/ee748655.aspx
Good luck, hope someone else finds this as useful as I did!
Lady_M MCITP SharePoint 2010