I assume you are using Linux: this error is a 'bad file number' error and usually indicates that 1) the socket was not opened, or 2) the socket was already closed before attempting a read or write. This could indicate that the other side has dropped the connection (eg killing of a program, bad network connection, bad NIC in client or server etc).

> We get this error every 20-30 minutes on one of our servers.
>
> DBSRV06 (Server) Sun Dec 13 10:02:56 2009
> INET/inet_error: select in packet_receive errno = 9
>
>
> DBSRV06 (Server) Sun Dec 13 10:27:03 2009
> INET/inet_error: read errno = 9
>
>
> DBSRV06 (Server) Sun Dec 13 10:33:14 2009
> INET/inet_error: select in packet_receive errno = 9
>
>
> But we do not know, what this means.

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