Oracle uses different algorithms to allocate extents, depending on whether they are
locally managed or dictionary managed.
With locally managed tablespaces, Oracle looks for free space to allocate to a new
extent by first determining a candidate datafile in the tablespace and then searching
the datafile’s bitmap for the required number of adjacent free blocks. If that datafile
does not have enough adjacent free space, then Oracle looks in another datafile.[@more@]
locally managed or dictionary managed.
With locally managed tablespaces, Oracle looks for free space to allocate to a new
extent by first determining a candidate datafile in the tablespace and then searching
the datafile’s bitmap for the required number of adjacent free blocks. If that datafile
does not have enough adjacent free space, then Oracle looks in another datafile.[@more@]
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