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Don Burleson Blog 







Removing ASM Datafiles From Disk

Expert Oracle Database Tips by Donald BurlesonDecember 20, 2015

Question:  I am having trouble removing some ASM datafiles from disk in my RAC cluster.  I created 3 new temp files and tried to delete the huge temp files. I did this "alter tablespace drop tempfile" from sqlplus:

 ALTER TABLESPACE PSTEMP DROP TEMPFILE '+DATA/isis/tempfile/pstemp.291.641298061';

But the huge files are still in ASM storage.  How do I permanently remove an ASM file from disk?

Answer:  If you are on 10gR2 or beyond, you can use asmcmd rm command to remove a data file. I think that you need to use one of the asmcmd commands to drop a datafile:

ASMCMD> rm -- remove file/directory

Just make sure your SID is set properly and type asmcmd from the command line. In there you can cd, ls, pwd and rm to remove ASM files and directories. Check out this article on using asmcmd commands.

You can use the alter diskgroup and drop diskgroup to remove ordinary ASM disk groups.

For more details on using ASM with RAC, see the book Oracle Grid & Real Application Clusters.

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