What are the ways tablespaces can be managed and how do they
differ?
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Answer / ram
tablespaces can be managed in 2 ways 1) Dictionary Managed
2) Locally managed
in DMT data dictionary tables stores the information of free and used extents, for used extents information in dmt tablespace uses sys.uet$ view and free extents information in DMT tablespace stored in sys.fet$
in LMT tablespace, tablespace datafiles maintains own bitmaps @ datafile headers these store the used extents and free extents information.
LMT is preferable, because it won't generate any rollbacks,
dictionary contention is reduced, space wastage removed & fragmentation removed
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / kittu
tablespaces can be managed in 2 ways 1) Dictionary Managed
2) Locally managed
In dictionary managed tablespace oracle will take care of tablespace
In locally managed tablespace we need to take care of tablespace
Is This Answer Correct ? | 1 Yes | 3 No |
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