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.htmlset verify off
undefine rowid_ranges
undefine segment_name
undefine owner
set head off
set pages 0
set trimspool onselect '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) || '''' ||';'from (select distinct b.rn,first_value(a.fid) over(partition by b.rn order by a.fid, a.bid rows between unbounded preceding and unbounded following) fid1,last_value(a.fid) over(partition by b.rn order by a.fid, a.bid rows between unbounded preceding and unbounded following) fid2,first_value(decode(sign(range2 - range1),1,a.bid +((b.rn - a.range1) * a.chunks1),a.bid)) over(partition by b.rn order by a.fid, a.bid rows between unbounded preceding and unbounded following) bid1,last_value(decode(sign(range2 - range1),1,a.bid +((b.rn - a.range1 + 1) * a.chunks1) - 1,(a.bid + a.blocks - 1))) over(partition by b.rn order by a.fid, a.bid rows between unbounded preceding and unbounded following) bid2from (select fid,bid,blocks,chunks1,trunc((sum2 - blocks + 1 - 0.1) / chunks1) range1,trunc((sum2 - 0.1) / chunks1) range2from (select /*+ rule */relative_fno fid,block_id bid,blocks,sum(blocks) over() sum1,trunc((sum(blocks) over()) / &&rowid_ranges) chunks1,sum(blocks) over(order by relative_fno, block_id) sum2from dba_extentswhere segment_name = upper('&&segment_name')and owner = upper('&&owner'))where sum1 > &&rowid_ranges) a,(select rownum - 1 rnfrom dualconnect by level <= &&rowid_ranges) bwhere b.rn between a.range1 and a.range2) c,(select max(data_object_id) oidfrom dba_objectswhere object_name = upper('&&segment_name')and owner = upper('&&owner')and data_object_id is not null) d/