ORA-01102: cannot mount database in exclusive mode
When opening or mounting the database, the following error is generated:
ORA-01102: cannot mount database in EXCLUSIVE mode.
I have only come across this error when using Oracle Parallel Server
(OPS). Here, this error indicates that another instance has already been
mounted in exclusive or parallel mode.
- Mount the database in parallel mode.
- Shutdown all other instances before mounting the database in exclusive
- Try stopping and then restarting the service '
This page represents one page of many pages of notes I made whilst working
with Oracle 7 through to 10i. I now no longer work with Oracle databases,
but hope that these notes will continue to be of benefit to others.
About the author: Brian Cryer
is a dedicated software developer and webmaster. For his day job he
develops websites and desktop applications as well as providing
IT services. He moonlights as a technical author and consultant.