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I have a table with well over 5 millions rows, that contains hierarchical data (~20 levels). The table is growing exponetially every year and the recursive method for CRUD operations from the table is becoming slow. The table recieves a high volume of updates, reads and deletes. Does any one know of any data models that would be suitable to replace the current Adjacency List Model, or what steps if any to speed up the table?
Have you looked at the HierachyID data type which is available in SQL Server 2008 onwards.
http://technet.microsoft.com/en-us/library/bb677290.aspx
There’s a good section on it’s use in this free e-book from MS Press
http://blogs.msdn.com/b/microsoft_press/archive/2009/11/16/free-e-book-introducing-microsoft-sql-server-2008.aspx