使用EXTEND方式来分段处理大表的搬数据

创建一个表: 记录rowid的分区段并作为处理的日志表：

DROP TABLE DEAL_TABLE_EXTENT;

CREATE TABLE DEAL_TABLE_EXTENT
(seq             number,
 OWNER           VARCHAR2(30),
 TABLE_NAME      VARCHAR2(30),
 EXTENT_ID       NUMBER ,     
 FILE_ID         NUMBER  ,    
 BLOCK_ID        NUMBER  ,     
 BLOCKS          NUMBER  ,    
 RELATIVE_FNO    NUMBER  , 
 MIN_ROWID       ROWID,
 NEXT_ROWID      ROWID,
 DEAL_FLAG       NUMBER  ,
 DEAL_ROW        NUMBER  ,
 BEGIN_TIME      DATE,
 END_TIME        DATE,
 ERR_MSG         VARCHAR2(2000)
);
comment on column DEAL_TABLE_EXTENT.DEAL_FLAG is '处理标志：0 正在处理,1 处理完成,-1 ' ;
comment on column DEAL_TABLE_EXTENT.DEAL_ROW is '该extent已经处理的记录数' ;
 
insert into DEAL_TABLE_EXTENT
 ( seq ,
   OWNER,
   TABLE_NAME,
   EXTENT_ID,
   FILE_ID,
   BLOCK_ID,
   BLOCKS,
   RELATIVE_FNO,
   MIN_ROWID
 )
 select rownum,
        owner,
        segment_name,
        EXTENT_ID,
        FILE_ID,
        BLOCK_ID,
        BLOCKS,
        RELATIVE_FNO,
        dbms_rowid.rowid_create(1, OBJ_ID,FILE_ID,BLOCK_ID,0)
   from (select owner,
                segment_name,
                EXTENT_ID,
                FILE_ID,
                BLOCK_ID,
                BLOCKS,
                RELATIVE_FNO,
                (select object_id from dba_objects where object_name='PAIM_FILE_STORAGE' and owner='EPCISIMSDATA') OBJ_ID
           from dba_extents
          where segment_name = 'PAIM_FILE_STORAGE'
          order by file_id, block_id);
commit ;
 
 create index ix_DEAL_TABLE_EXTENT_seq on DEAL_TABLE_EXTENT(seq);
 
UPDATE  DEAL_TABLE_EXTENT ATE1
SET NEXT_ROWID=(SELECT MIN_ROWID FROM  DEAL_TABLE_EXTENT ATE2 WHERE ATE2.SEQ=ATE1.SEQ+1) ;
    
commit ;
-----------最后一个extent 特殊处理 ----------------------
UPDATE  DEAL_TABLE_EXTENT ATE1
SET NEXT_ROWID= (select dbms_rowid.rowid_create(1, object_id,FILE_ID,BLOCK_ID+Blocks,0)  from dba_objects where object_name='PAIM_FILE_STORAGE' and owner='EPCISIMSDATA') 
where  NEXT_ROWID is null   ;
commit ;

创建存储过程,按ROWID分段处理

create or replace procedure push_paim_file_storage_1
is
---- PAIM_FILE_STORAGE 搬数据脚本
l_min_rowid rowid  ;
l_next_rowid rowid ;

Begin
  for i in (select seq,min_rowid,next_rowid from DEAL_TABLE_EXTENT
   where seq<50000 AND (deal_flag<>'1' OR deal_flag is null) order by seq)
   loop
     begin
     update DEAL_TABLE_EXTENT set BEGIN_TIME=SYSDATE WHERE SEQ=I.SEQ;
     insert /*+ append */ into epcisimsdata.paim_file_storage
       select * from epcisimsdata.paim_file_storage@TOCOWEPCISBS where rowid>=i.min_rowid and rowid<i.next_rowid;
      update DEAL_TABLE_EXTENT set deal_flag='1',END_TIME=SYSDATE WHERE SEQ=I.SEQ;
      COMMIT;
      exception when others then
      update DEAL_TABLE_EXTENT set deal_flag='0',END_TIME=SYSDATE WHERE SEQ=I.SEQ;
      end ;
   end loop ;

End ;

注意事项:

select rowid rid
,dbms_rowid.rowid_object(rowid) object_id
,dbms_rowid.rowid_relative_fno(rowid) fno
,dbms_rowid.rowid_block_number(rowid) block_num
,dbms_rowid.rowid_row_number(rowid) row_num
,PROGRAM_INTERFACE_TRACE.*
from PROGRAM_INTERFACE_TRACE sample block (0.001) order by rowed

可以看到, rowed的排序与FILE_ID也有关的, 而extend_id 与FILE_ID没有关系

ROWID的字符排和 ROWID 本身排序是两回事, 不能同一样处理

select rownum rn, a.* from (select ROWIDTOCHAR(rowid) rid
,dbms_rowid.rowid_object(rowid) object_id
,dbms_rowid.rowid_relative_fno(rowid) fno
,dbms_rowid.rowid_block_number(rowid) block_num
,dbms_rowid.rowid_row_number(rowid) row_num,
 a.* from AJ50.AJ_JOBS a ) a order by rid

使用ROWIDTOCHAR 或者 CHARtoROWID转换