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If you get an error of the following type for some queries, it means that MySQL cannot create a temporary file for the result set in the temporary directory:

Can't create/write to file '\\sqla3fe_0.ism'.

The preceding error is a typical message for Windows; the Unix message is similar.

One fix is to startmysqld with the--tmpdir option or to add the option to the[mysqld] section of your option file. For example, to specify a directory ofC:\temp, use these lines:

[mysqld]tmpdir=C:/temp

TheC:\temp directory must exist and have sufficient space for the MySQL server to write to. SeeSection 4.2.2.2, “Using Option Files”.

Another cause of this error can be permissions issues. Make sure that the MySQL server can write to thetmpdir directory.

Check also the error code that you get withperror. One reason the server cannot write to a table is that the file system is full:

$> perror 28OS error code  28:  No space left on device

If you get an error of the following type during startup, it indicates that the file system or directory used for storing data files is write protected. Provided that the write error is to a test file, the error is not serious and can be safely ignored.

Can't create test file /usr/local/mysql/data/master.lower-test