Can i use safely "ALTER TABLESPACE tablespace_name COALESCE" to free up unused space in any tablespace ( like ununsed extents). Is there any way to find if a tablespace needs to be COALESCED to free up space before we go ahead adding space to tablespace using "ADD DATAFILE" clause? Is there any disadvantange or any other complication using this "COALESCE" command or is it safe enough?
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