Basic clarifications on DDLs

Hi ,

     Please help me in understanding the DDLs better :

(1) Are Rollback Segments allocated to DDLs ? If not then how to
explain the following situation :

  " DDLs as I understand are just DMLs on the dictionary tables. Hence a CREATE TABLE statement would basically insert & update many rows into the DD tables. Suppose a create table statement aborts in the middle , what is the status of the DMLs done on the DD tables , how is consistency maintained ? "

(2) Why are DDLs treated as ATOMIC transactions ? In other words , why
do the DDLs ( treated as a single transaction ) get automatically commited ?

   Thanks in advance.

   PLEASE EMAIL YOUR RESPONSE TO tkrishna_at_baan.com

   Krish.

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