学习笔记:Oracle 12C数据库可以通过expdp导出view数据

时间:2016-06-17 14:18 来源:Oracle研究中心作者:惜分飞点击: 次

天萃荷净 ORACLE 12C可以通过expdp导出view数据有时候,ORACLE能够导出某个视图中的数据,然后通过这个视图来迁移需要的数据,现在ORACLE 12C通过expdp的views_as_tables来实现了该功能,把视图当作一个普通表从而导出数据,导入的时候直接和一个正常表一样,通过视图的导出,表的导入来实现相关需求

1.Oracle 12C环境搭建

SQL> SELECT * FROM V$VERSION;

BANNER                                                                               CON_ID
-------------------------------------------------------------------------------- ----------
Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit                         0
PL/SQL Release 12.1.0.0.2                                                                 0
CORE    12.1.0.0.2                                                                        0
TNS for Linux: Version 12.1.0.0.2                                                         0
NLSRTL Version 12.1.0.0.2                                

SQL> create table t_lx as select * from v$log; 

Table created.

SQL> create table t_xl as select * from v$logfile;

Table created.

SQL> create view v_oracleplus  as
  2   SELECT thread#,
  3           a.sequence#,
  4           a.group#,
  5           TO_CHAR (first_change#, '9999999999999999') "SCN",
  6           a.status,
  7           MEMBER
  8      FROM t_lx a, t_xl b
  9     WHERE a.group# = B.GROUP#
 10  ORDER BY a.sequence# DESC;

View created.

SQL> col member for a50    
SQL> set lines 134
SQL> select * from v_oracleplus;

   THREAD#  SEQUENCE#     GROUP# SCN               STATUS           MEMBER
---------- ---------- ---------- ----------------- ---------------- -------------------------------------------
         1         30          3            391892 CURRENT          /u01/app/oracle/oradata/oracleplus/redo03.log
         1         29          2            377363 INACTIVE         /u01/app/oracle/oradata/oracleplus/redo02.log
         1         28          1            374892 INACTIVE         /u01/app/oracle/oradata/oracleplus/redo01.log

2.expdp结合VIEWS_AS_TABLES导出视图

[oracle@oracleplus ~]$ expdp xff/oracleplus views_as_tables=v_oracleplus directory=data_pump_dir dumpfile=oracleplus.dmp

Export: Release 12.1.0.0.2        on Sun Dec 16 07:56:48 2012

Copyright (c) 1982, 2012, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit     
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Starting "XFF"."SYS_EXPORT_TABLE_01":xff/******** views_as_tables=v_oracleplus directory=data_pump_dir
 dumpfile=oracleplus.dmp 
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/VIEWS_AS_TABLES/TABLE_DATA
Total estimation using BLOCKS method: 16 KB
Processing object type TABLE_EXPORT/VIEWS_AS_TABLES/TABLE
. . exported "XFF"."V_oracleplus"                          7.390 KB       3 rows
Master table "XFF"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for XFF.SYS_EXPORT_TABLE_01 is:
  /u01/app/oracle/admin/oracleplus/dpdump/oracleplus.dmp
Job "XFF"."SYS_EXPORT_TABLE_01" successfully completed at Sun Dec 16 07:58:17 2012 elapsed 0 00:00:56

3.impdp导入视图数据

[oracle@oracleplus ~]$ impdp xff/oracleplus remap_table=v_oracleplus:v_xff directory=data_pump_dir dumpfile=oracleplus.dmp

Import: Release 12.1.0.0.2        on Sun Dec 16 08:06:06 2012

Copyright (c) 1982, 2012, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit     
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Master table "XFF"."SYS_IMPORT_FULL_01" successfully loaded/unloaded
Starting "XFF"."SYS_IMPORT_FULL_01":xff/******** remap_table=v_oracleplus:v_xff directory=data_pump_dir
 dumpfile=oracleplus.dmp 
Processing object type TABLE_EXPORT/VIEWS_AS_TABLES/TABLE
Processing object type TABLE_EXPORT/VIEWS_AS_TABLES/TABLE_DATA
. . imported "XFF"."V_XFF"                               7.390 KB       3 rows
Job "XFF"."SYS_IMPORT_FULL_01" successfully completed at Sun Dec 16 08:06:20 2012 elapsed 0 00:00:10

验证数据

SQL> COL OBJECT_NAME FOR A20
SQL> select object_type,object_name from user_objectS where object_name like 'V_X%';

OBJECT_TYPE             OBJECT_NAME
----------------------- --------------------
VIEW                    V_oracleplus
TABLE                   V_XFF

SQL> col member for a50
SQL> set lines 134
SQL> select * from v_XFF;

   THREAD#  SEQUENCE#     GROUP# SCN               STATUS           MEMBER
---------- ---------- ---------- ----------------- ---------------- --------------------------------------------
         1         30          3            391892 CURRENT          /u01/app/oracle/oradata/oracleplus/redo03.log
         1         29          2            377363 INACTIVE         /u01/app/oracle/oradata/oracleplus/redo02.log
         1         28          1            374892 INACTIVE         /u01/app/oracle/oradata/oracleplus/redo01.log

通过测试证明在12C中ORACLE的expdp/impdp可以实现导出视图数据,进入导入到[其他库]其他表中

--------------------------------------ORACLE-DBA----------------------------------------

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