LMT : Locally managed tablespace
      Uniform extent size in the tablespace.
      Specify next extent size and pctincrease with LMT will not cause error,
      they will just be ignored by ORACLE. Initial extent size still relavent
      with LMT. All extents created in the future will be of the same size as the initial extent.
ASSM : Automatic segment space management. 
       Use bitmap, instead of freelist, to track space usage in the data blocks.
PCTFREE : How much space is reserved in the data block for future update.
          PCTFREE is still relavent with LMT nad ASSM.
PCTUSED : Threshhold below which the data block will be made available for insert.
          PCTUSED has become obsolete in 9i - if the ASSM is used.
          Incuding it in the table creation statement will not cause error,
          it will just be ignored by ORACLE.