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rfusca
Asked: 2013-01-11 06:10:15 +0800 CST

将作为主键的分区全局非唯一索引更改为非分区唯一索引

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我们系统中最大的表之一将其主键设置为全局分区（在巨大的、无用的、数十亿值范围内）非唯一索引。它的值只是一个序列值，它们绝对是唯一的。我想将索引更改为普通的全局（表已分区）唯一索引。

我可以在不删除约束和索引然后重建的情况下做到这一点吗？在此期间表将没有这个重要的索引？

oracle index

1 个回答

  1. Best Answer

    您可以使用 来执行此操作DBMS_REDEFINITION，但您需要将表格占用的空间增加一倍。

    如果我正确阅读了您的问题，应该这样做：

    [oracle@node1 ~]$ sqlplus phil/phil

SQL*Plus: Release 11.2.0.2.0 Production on Sun Jan 6 18:47:12 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> set echo on
SQL> @part
SQL>
SQL> drop table PARTITIONED_INTERIM;

Table dropped.

SQL>
SQL> drop table partitioned;

Table dropped.

SQL>
SQL> create table partitioned
  2  (
  3  pk number,
  4  blah  varchar(40),
  5  blah2 varchar(40)
  6  )
  7  partition by range (pk)
  8  (partition p1 values less than (1000),
  9   partition p2 values less than (10000),
 10   partition p3 values less than (30000),
 11   partition p4 values less than (MAXVALUE)
 12   );

Table created.

SQL>
SQL> create index pk_idx
  2  on partitioned (pk)
  3  global partition by range (pk)
  4  (partition p1 values less than (1000),
  5   partition p2 values less than (10000),
  6   partition p3 values less than (30000),
  7   partition p4 values less than (MAXVALUE)
  8   )
  9  ;

Index created.

SQL>
SQL> ALTER TABLE partitioned ADD CONSTRAINT ppk PRIMARY KEY (pk) USING INDEX pk_idx;

Table altered.

SQL>
SQL> select index_name, uniqueness , table_name, partitioned
  2  from user_indexes
  3  where table_name = 'PARTITIONED';

INDEX_NAME                     UNIQUENES TABLE_NAME                     PAR
------------------------------ --------- ------------------------------ ---
PK_IDX                         NONUNIQUE PARTITIONED                    YES

SQL>
SQL> EXEC dbms_redefinition.can_redef_table('PHIL', 'PARTITIONED');

PL/SQL procedure successfully completed.

SQL>
SQL> create table PARTITIONED_INTERIM as ( select * from PARTITIONED where 1=0 );

Table created.

SQL>
SQL> exec DBMS_REDEFINITION.start_redef_table(uname =>     'PHIL',orig_table => 'PARTITIONED',int_table => 'PARTITIONED_INTERIM');

PL/SQL procedure successfully completed.

SQL>
SQL> create unique index partitioned_interim_pk on partitioned_interim (pk) global online;

Index created.

SQL>
SQL> exec dbms_redefinition.sync_interim_table(uname => 'PHIL',orig_table => 'PARTITIONED',int_table => 'PARTITIONED_INTERIM');

PL/SQL procedure successfully completed.

SQL>
SQL> exec dbms_redefinition.finish_redef_table(uname => 'PHIL',orig_table => 'PARTITIONED',int_table => 'PARTITIONED_INTERIM');

PL/SQL procedure successfully completed.

SQL>
SQL> select index_name, uniqueness , table_name, partitioned
  2  from user_indexes
  3  where table_name = 'PARTITIONED';

INDEX_NAME                     UNIQUENES TABLE_NAME                     PAR
------------------------------ --------- ------------------------------ ---
PARTITIONED_INTERIM_PK         UNIQUE    PARTITIONED                    NO

SQL>
SQL>
SQL>

    请注意，您还必须使用DBMS_REDEFINITION.COPY_TABLE_DEPENDENTS()and处理其他索引/对象等DBMS_REDEFINITION.REGISTER_DEPENDENT_OBJECT()。

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