以下脚本可以用于将表按照rowid范围分区，获得指定数目的rowid Extent区间(Group sets of rows in the table into smaller chunks)， 以便于非分区表利用rowid来实现并行删除或更新：   
REM  rowid_ranges should be at least 21
REM  utilize this script help delete large table
REM  if update large table  Why not online redefinition or CTAS
-- This script spits desired number of rowid ranges to be used for any parallel operations.
-- Best to use it for copying a huge table with out of row lob columns in it or CTAS/copy the data over db links.
-- This can also be used to simulate parallel insert/update/delete operations.
-- Maximum number of rowid ranges you can get here is 255.
-- Doesn't work for partitioned tables, but with minor changes it can be adopted easily.

-- Doesn't display any output if the total table blocks are less than rowid ranges times 128.

-- It can split a table into more ranges than the number of extents
From Saibabu Devabhaktuni  http://sai-oracle.blogspot.com/2006/03/how-to-split-table-into-rowid-ranges.html



set verify off
undefine rowid_ranges
undefine segment_name
undefine owner
set head off
set pages 0
set trimspool on

select 'where rowid between ''' ||sys.dbms_rowid.rowid_create(1, d.oid, c.fid1, c.bid1, 0) ||''' and ''' ||sys.dbms_rowid.rowid_create(1, d.oid, c.fid2, c.bid2, 9999) || '''' ||';'