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Can't create/write to file

I have a web-server running windows server 2003 web-edition, with a mysql database. The server runs without problems since more than 1 year. Recently however I sometimes get the error: Can't create/write to file 'c:\winnt\temp\#sql_3bc_0.MYI' (Errcode: 13).
Yes, the directory exists and the right security settings are applied. The error occurs not every query, but only now and then. Has it something to do with the growing size of the database? Use of memory? When a result of a table gets too large it's written to disk?
Hope someone can help!
1 Solution
The file that it is trying to create is a temporary file that MySQL uses when a query has to process too much information for it to do it all in memory and a file must be created on the disk.  I have run into that error before and I was able to fix it by creating a temp directory in the mysql directory (C:\mysql\temp) and then starting the server with the option:


Hope this helps.

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