How to restore existing SharePoint site collection on same farm.

Hi, I need to restore existing MOSS 2007 site collection of size 500 GB on same farm and I am using database backup and restore method on the same SQL server, below are the steps I have taken.
1.Taken SQL backup of existing database “WSS_content_HR” database (and URL is http://myworld:81)
2.Restored backup on new Database “WSS_Content_AdminHR” on the same SQL Server.
3.Created new webapplication “myworld:123” .
4.Run the below STSADM command to attach new database “WSS_Content_AdminHR” on the SharePoint farm:
stsadm.exe -o addcontentdb -url "http:// myworld:123" -assignnewdatabaseid -databasename " WSS_Content_AdminHR " -databaseserver "MOSSDatabase\MOSS_03"

Now “WSS_Content_AdminHR” database showing in Central Administration site under Content Database section under “http:// myworld:123” web application BUT the site collection is not showing in Central Administration site under Site Collection List.
Kindly help what I have to do now?
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Minesh ShahSharePoint & all about itAsked:
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Each site collectipn has a unique identifier and you will not be able to restore it in a same farm (ie clone it).   Either you restore to a different farm or restore via STSADM.EXE.  This is a known issue.

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