12c的在线重定义

12C的在线重定义，有新的特性，可以通过一条命令进行在线重定义，而不会像11g那样，要好几个步骤。

12c的官方文档中是这样说的

129.7.8 REDEF_TABLE Procedure

This procedure provides a single interface that integrates several redefinition steps including the CAN_REDEF_TABLE Procedure, the START_REDEF_TABLE Procedure, the COPY_TABLE_DEPENDENTS Procedure and the FINISH_REDEF_TABLE Procedure.

This procedure can change data storage properties including tablespaces (for table, partition, subpartition, index, LOB column), compress type (for table, partition, subpartition, index, LOB column) and STORE_AS clause for the LOB column.

语法：

DBMS_REDEFINITION.REDEF_TABLE (
   uname                       IN  VARCHAR2,
   tname                       IN  VARCHAR2,    
   table_compression_type      IN  VARCHAR2 := NULL, 
   table_part_tablespace       IN  VARCHAR2 := NULL, 
   index_key_compression_type  IN  VARCHAR2 := NULL,
   index_tablespace            IN  VARCHAR2 := NULL,
   lob_compression_type        IN  VARCHAR2 := NULL,
   lob_tablespace              IN  VARCHAR2 := NULL,
   lob_store_as                IN  VARCHAR2 := NULL,
   refresh_dep_mviews          IN  VARCHAR2 := 'N',
   dml_lock_timeout            IN  PLS_INTEGER := NULL);

创建测试用的用户，表

create user c##bb identified by oracle;
alter user c##bb default tablespace users;
grant resource,connect to c##bb container=all;
grant dba to c##bb container=all;


SYS@win12c>create user c##bb identified by oracle;

用户已创建。

SYS@win12c>alter user c##bb default tablespace users;

用户已更改。

SYS@win12c>grant resource,connect to c##bb container=all;

授权成功。

SYS@win12c>grant dba to c##bb container=all;

授权成功。

SYS@win12c>

conn c##bb/oracle@win12c 
create table t1 (id number) tablespace users;

declare i integer;
begin
for i in 1..100 loop
insert into t1 values(i);
end loop;
commit;
end;



SYS@win12c>conn c##bb/oracle@win12c
已连接。
C##BB@win12c>create table t1 (id number) tablespace users;

表已创建。

C##BB@win12c>
C##BB@win12c>declare i integer;
  2  begin
  3  for i in 1..100 loop
  4  insert into t1 values(i);
  5  end loop;
  6  commit;
  7  end;
  8  /

PL/SQL 过程已成功完成。

C##BB@win12c>
C##BB@win12c>select count(*) from c##bb.t1;

  COUNT(*)
----------
       100

C##BB@win12c>

C##BB@win12c>select owner,table_name,tablespace_name from dba_tables where owner='C##BB';

OWNER      TABLE_NAME TABLESPACE
---------- ---------- ----------
C##BB      T1         USERS

C##BB@win12c>

创建测试用的表空间，进行在线重定义。通过在线重定义，将表从一个表空间转移到另一个表空间

create tablespace bb datafile 'E:\ORADATA\ORCL\bb01.DBF' size 100M;

exec dbms_redefinition.redef_table('C##BB','T1','BB');

BEGIN
   DBMS_REDEFINITION.REDEF_TABLE(
     uname                        => 'C##BB',
     tname                        => 'T1',
     table_compression_type       => NULL,
     table_part_tablespace        => 'BB',
     index_key_compression_type   => NULL,
     index_tablespace             => NULL,
     lob_compression_type         => NULL,
     lob_tablespace               => NULL,
     lob_store_as                 => NULL);
END;

C##BB@win12c>create tablespace bb datafile 'E:\ORADATA\ORCL\bb01.DBF' size 100M;

表空间已创建。

进行在线重定义

C##BB@win12c>BEGIN
  2     DBMS_REDEFINITION.REDEF_TABLE(
  3       uname                        => 'C##BB',
  4       tname                        => 'T1',
  5       table_compression_type       => NULL,
  6       table_part_tablespace        => 'BB',
  7       index_key_compression_type   => NULL,
  8       index_tablespace             => NULL,
  9       lob_compression_type         => NULL,
 10       lob_tablespace               => NULL,
 11       lob_store_as                 => NULL);
 12  END;
 13  /

PL/SQL 过程已成功完成。

再次查看表C##BB.T1的表空间，由USERS变成了BB

C##BB@win12c>select owner,table_name,tablespace_name from dba_tables where owner='C##BB';

OWNER      TABLE_NAME TABLESPACE_NAME
---------- ---------- --------------------
C##BB      T1         BB

C##BB@win12c>

END

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