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Oracle Error Tips by Donald Burleson(S. Karam)
The Oracle docs note this on the ORA-01041 error:
ORA-01041: internal error. hostdef extension doesn"t exist Cause: Pointer to hstdef extension in hstdef is null. Action: Report as a bug
If ORA-01041 is thrown, an internal error has occurred in which the pointer to the hstdef extension in hstdef is null.
In Oracle, many times ORA-01041 is thrown after either startup or shutdown. If you are using SQL*Plus, you will have to reconnect to the database or start a new SQL*Plus session. The ORA-01041 has been known to be caused by a bug which des not seem to allow a shutdown immediately followed by a startup in a congruent SQL*Plus session.
To resolve ORA-01041, you should report the error as a bug. In the case of ORA-01041 as a response to performing shutdown and startup, you can use the ipcrm command and remove allocated shared memory segments.
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