James, that is a "permission denied" OS error.

When you run an alter table command (adding a field) MySQL builds a new table alongside the old, then swaps them. Some file move/rename perations are associated with that.

I would check that the mysql user on your system has full privileges on the data and database directories and database files.

Dan



James Sherwood wrote:
Hello,

Today we tried to create a new field on a table in one of our databases.  When 
we tried to save the field we get the error:

Error on rename of "./DBNAME/TABLENAME.MYI" to "./DBNAME/#SQL2-210-174.MYI" 
(Errorcode: 13)

Has anyone ever seen this before?

Thanks,
James

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