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Datafiles that start with +DATA vs path and end in .dbf

in Database Administration (MOSC) 4 commentsAnswered ✓

I'm trying to learn how to "reclaim unused space in datafiles" using this page: https://oracle-base.com/articles/misc/reclaiming-unused-space

When I query the "name" in v$datafile or any other view that has the name of my datafile, my name starts with "+DATA" and does NOT end in ".dbf". The article's name has a valid path and DOES end in ".dbf". When I "ALTER DATABASE DATAFILE" using the name of my datafile, I get an ORA-02236: invalid file name error.

It appears this is ASM, which I know nothing about. I've searched the Interweb all day and am not getting an understanding of this. Any advice for this newbee would be appreciated. I can't ask my DBA, because that would be me.

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