All about rowid in Oracle Database 11g

SQL> select t.rowid,t.* from scott.test t;

ROWID                  DEPTNO DNAME          LOC
------------------ ---------- -------------- -------------
AAAPtpAAEAAAADbAAA         10 ACCOUNTING     NEW YORK
AAAPtpAAEAAAADbAAB         20 RESEARCH       DALLAS
AAAPtpAAEAAAADbAAC         30 SALES          CHICAGO
AAAPtpAAEAAAADbAAD         40 OPERATIONS     BOSTON
rowid（AAAPtpAAEAAAADbAAD）詳解
AAAPtp  --object#
AAE     --file#
AAAADb  --block#
AAD     --row#

SQL> select rowid ,
  2  substr(rowid,1,6) "OBJECT#",
  3  substr(rowid,7,3) "FILE#",
  4  substr(rowid,10,6) "BLOCK#",
  5  substr(rowid,16,3) "ROW#"
  6  from scott.test;

ROWID              OBJECT#                  FILE#        BLOCK#                   ROW#
------------------ ------------------------ ------------ ------------------------ ------------
AAAPtpAAEAAAADbAAA AAAPtp                   AAE          AAAADb                   AAA
AAAPtpAAEAAAADbAAB AAAPtp                   AAE          AAAADb                   AAB
AAAPtpAAEAAAADbAAC AAAPtp                   AAE          AAAADb                   AAC
AAAPtpAAEAAAADbAAD AAAPtp                   AAE          AAAADb                   AAD


轉換 rowid 的 object#

SQL> select DBMS_ROWID.ROWID_OBJECT('AAAPtpAAEAAAADbAAD') from dual
  2  union all
  3  select object_id  from dba_objects where object_name = 'TEST' AND owner='SCOTT';

DBMS_ROWID.ROWID_OBJECT('AAAPTPAAEAAAADBAAD')
---------------------------------------------
                                        64361
                                        64361

轉換 rowid 的 file# （相對文件編號）

SQL> select DBMS_ROWID.ROWID_RELATIVE_FNO('AAAPtpAAEAAAADbAAD') from dual
  2  union all
  3  select a.file_id from dba_data_files a,dba_segments b where b.SEGMENT_NAME ='TEST' and b.owner='SCOTT' and a.tablespace_name=b.tablespace_name;

DBMS_ROWID.ROWID_RELATIVE_FNO('AAAPTPAAEAAAADBAAD')
---------------------------------------------------
                                                  4
                                                  4
                                                  
轉換 rowid 的 block#
                                                  
SQL> select dbms_rowid.rowid_block_number('AAAPtpAAEAAAADbAAD') from dual;

DBMS_ROWID.ROWID_BLOCK_NUMBER('AAAPTPAAEAAAADBAAD')
---------------------------------------------------
                                                219
                                                
轉換 rowid 的 row#

SQL>  select DBMS_ROWID.ROWID_ROW_NUMBER(rowid) from scott.test;

DBMS_ROWID.ROWID_ROW_NUMBER(ROWID)
----------------------------------
                                 0
                                 1
                                 2
                                 3


轉換 rowid 的絕對文件編號

SQL> select DBMS_ROWID.ROWID_TO_ABSOLUTE_FNO('AAAPtpAAEAAAADbAAD','SCOTT','TEST') from scott.test;

DBMS_ROWID.ROWID_TO_ABSOLUTE_FNO('AAAPTPAAEAAAADBAAD','SCOTT','TEST')
---------------------------------------------------------------------
                                                                    4
                                                                    4
                                                                    4

                                                                    4

轉載請註明作者出處及原文鏈接，否則將追究法律責任：

作者：xiangsir

原文鏈接：http://blog.csdn.net/xiangsir/article/details/13291441

QQ：444367417

MSN：[email protected]