在Oracle中，一个DDL语句执行的过程如下：
Issue a COMMIT before executing the CREATE TABLE statement
■Verify that user privileges are sufficient to create the table
■Determine which tablespace the table should reside in
■Ensure that the tablespace quota has not been exceeded
■Ensure that no object in the schema has the same name
■Insert rows that define the table into the data dictionary
■Issue a COMMIT if the DDL statement succeeded or a ROLLBACK if it did not
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