Hi Mitchell,
The steps should work. Oracle recommends to shutdown the mounted database before opening again after the change(I am not sure about if this is required) I would just open the closed db .
I usually,
a.Backup the database(going to do a structural change!)
b.Take the tablespace connected to the tablespace offline if the datafiles belong to non system t/s(it would be better to shutown , start and mount if it is in Production !)
c.copy the datafiles to the new location and rename using o/s commands.
d.Rename the datafiles in Oracle using alter tablespace <t/s name> rename datafile 'old file ' to 'new file'
e.bring the tablespace online or shutdown and restart the db or iopen the mounted db as the case may be.
f.Full Backup db again with the new structure.
HTH.
Jyoti
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