Oracle : Ошибка ORA-09844

"soacon: Archmon unable to open named pipe."
*Cause: open() failed to open named pipe ?/dbs/mon2arch_@.
*Action: Only the oracle dba can run archmon. Make sure that your
current OS login has owner or group search permission for the
ORACLE_HOME/dbs directory. The max number of open files may have
been exceeded.

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