Oracle Rowid ½éÉÜ

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SQL> conn sys/admin as sysdba
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SQL> create table bl(id number);
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SQL> insert into bl values(1);
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SQL> select owner,segment_name,file_id,RELATIVE_FNO,block_id from dba_extents wh
ere owner='SYS' and segment_name='BL';
OWNER SEGMENT_NA   FILE_ID  RELATIVE_FNO   BLOCK_ID
-----    ----------           ----------    ------------          ----------
SYS    BL                  1           1            62129
 
SQL> desc dbms_rowid.rowid_info
PACKAGE SYS.DBMS_ROWID
PROCEDURE ROWID_INFO
 Argument Name                  Type                    In/Out
 ------------------------------ ----------------------- ------
 ROWID_IN                       ROWID                   IN   
 ROWID_TYPE                     NUMBER                  OUT   
 OBJECT_NUMBER                  NUMBER