How to remove an ASM instance and its corresponding database(s) on WINDOWS

1) Shutdown all datbases that are running on the box using the +ASM instance for storage management

2) Use emca -x <sid> to remove the Database Console for each instance

3) Remove the service for the instances

ORADIM -DELETE -SID <sid> and ORADIM -DELETE -ASMSID <asm sid>

to delete the services for the database(s)/instances

If using RAC ... remove the asm service with .... svrctl remove asm -n <nodename>

3) Remove the PFILEs / SPFILEs and password files (orapw<sid>) for the ASM and Databases

Default location: <ORACLE_HOME>\DATABASE

4) Delete / Remove any non ASM supporting directories

BACKGROUND_DUMP_DEST
USER_DUMP_DEST
CORE_DUMP_DEST
etc

5) Format the ASM disks

From Oracle

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