模拟行迁移试验

1、创建scott模式

[oracle@std dbs]$ sqlplus '/as sysdba'

SQL*Plus: Release 10.2.0.1.0 - Production on Mon Feb 17 14:59:02 2014

Copyright (c) 1982, 2005, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> select user_id,username from dba_users;

   USER_ID USERNAME
---------- ------------------------------
    11 OUTLN
     0 SYS
     5 SYSTEM
    24 DBSNMP
    21 TSMSYS
    19 DIP

6 rows selected.

SQL> @?/rdbms/admin/utlsampl.sql
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

2、备份EMP表

[oracle@std dbs]$ sqlplus scott/tiger

SQL*Plus: Release 10.2.0.1.0 - Production on Mon Feb 17 15:02:50 2014

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Error accessing PRODUCT_USER_PROFILE
Warning:  Product user profile information not loaded!
You may need to run PUPBLD.SQL as SYSTEM

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> select * from tab;

TNAME                   TABTYPE    CLUSTERID
------------------------------ ------- ----------
DEPT                   TABLE
EMP                   TABLE
BONUS                   TABLE
SALGRADE               TABLE

SQL> select constraint_name,constraint_type,table_name from user_constraints;

CONSTRAINT_NAME            C TABLE_NAME
------------------------------ - ------------------------------
FK_DEPTNO               R EMP
PK_DEPT                P DEPT
PK_EMP                   P EMP

SQL> alter table emp drop constraints pk_emp;

Table altered.

3、分析行连接

SQL> @?/rdbms/admin/utlchain.sql

Table created.

SQL> select * from tab;

TNAME                   TABTYPE    CLUSTERID
------------------------------ ------- ----------
DEPT                   TABLE
EMP                   TABLE
CHAINED_ROWS               TABLE
BONUS                   TABLE
SALGRADE               TABLE
EMP2                   TABLE

6 rows selected.

SQL> analyze table emp list chained rows into chained_rows;

Table analyzed.

SQL> select count(*) from chained_rows where table_name='EMP';

  COUNT(*)
----------
     0

4、模拟产生行连接

SQL> truncate table emp;

Table truncated.

SQL> alter table emp pctfree 0;

Table altered.

SQL> insert into emp select * from emp2;

14 rows created.

SQL> insert into emp select * from emp;

14 rows created.

SQL> /

28 rows created.

SQL> /

56 rows created.

SQL> /

112 rows created.

SQL> /

224 rows created.

SQL> /

448 rows created.

SQL> /

896 rows created.

SQL> /

1792 rows created.

SQL> commit;

Commit complete.

SQL> desc emp
 Name                       Null?    Type
 ----------------------------------------- -------- ----------------------------
 EMPNO                            NUMBER(4)
 ENAME                            VARCHAR2(10)
 JOB                            VARCHAR2(9)
 MGR                            NUMBER(4)
 HIREDATE                        DATE
 SAL                            NUMBER(7,2)
 COMM                            NUMBER(7,2)
 DEPTNO                         NUMBER(2)

SQL> update emp set ename='AAAAAAAAAA' where empno=7844;

256 rows updated.

SQL> commit;

Commit complete.

SQL> analyze table emp list chained rows into chained_rows;

Table analyzed.

SQL> select count(*) from chained_rows where table_name='EMP';

  COUNT(*)
----------
    30

5、消除行迁移

SQL> create table emp_old as select * from emp where rowid in
  2  (select head_rowid from chained_rows
  3  where table_name='EMP');

Table created.

SQL> delete from emp where rowid in 
  2  (select head_rowid from chained_rows
  3  where table_name='EMP');

30 rows deleted.

SQL> insert into emp select * from emp_old;

30 rows created.

SQL> drop table emp_old;

Table dropped.

SQL> delete from chained_rows where table_name='EMP';

30 rows deleted.

SQL> commit;

Commit complete.

SQL> analyze table emp list chained rows into chained_rows;

Table analyzed.

SQL> select count(*) from chained_rows where table_name='EMP';

  COUNT(*)
----------
     0