oracle分区索引的失效和重建代码示例

--创建测试表
SQL> create table t as select object_id,object_name from dba_objects;

SQL> select min(object_id),max(object_id) from t;
MIN(OBJECT_ID) MAX(OBJECT_ID)
-------------- --------------
       2     76083
SQL> create table t_part(object_id int,object_name varchar2(1000)) partition by range(object_id)
 2 (
 3 partition p1 values less than (10000),
 4 partition p2 values less than (20000),
 5 partition p3 values less than (30000),
 6 partition p4 values less than (40000),
 7 partition pm values less than (maxvalue));

SQL> insert into t_part select * from t;

SQL> commit;
--创建本地分区索引
SQL> create index idx_part_local on t_part(object_name) local;

SQL> create index idx_part_global on t_part(object_id) global;

SQL> alter table t_part drop partition p1;

SQL> select status,index_name from user_indexes s where index_name='IDX_PART_GLOBAL';
STATUS  INDEX_NAME
-------- ------------------------------
UNUSABLE IDX_PART_GLOBAL

SQL> select status,index_name from user_ind_partitions s where index_name='IDX_PART_LOCAL';

STATUS  INDEX_NAME
-------- ------------------------------
USABLE  IDX_PART_LOCAL
USABLE  IDX_PART_LOCAL
USABLE  IDX_PART_LOCAL
USABLE  IDX_PART_LOCAL
--重建失效索引
SQL> alter index idx_part_global rebuild;

SQL> drop index idx_part_global;

SQL> CREATE INDEX idx_part_global_full ON t_part (object_id)
 2   GLOBAL PARTITION BY RANGE (object_id)
 3    (PARTITION p1 VALUES LESS THAN (10000),
 4     PARTITION p2 VALUES LESS THAN (30000),
 5     PARTITION p3 VALUES LESS THAN (MAXVALUE));

--删除其中一个分区
SQL> alter table t_part drop partition p3;

--全局分区索引失效
SQL> select status,index_name from user_ind_partitions s where index_name='IDX_PART_GLOBAL_FULL';
STATUS  INDEX_NAME
-------- ------------------------------
UNUSABLE IDX_PART_GLOBAL_FULL
UNUSABLE IDX_PART_GLOBAL_FULL
UNUSABLE IDX_PART_GLOBAL_FULL
SQL> select /*+index(t IDX_PART_LOCAL)*/ * from t_part t where object_name = '/7f6c264c_IIOPAddress';
 OBJECT_ID OBJECT_NAME
---------- -----------------------------------
   35031 /7f6c264c_IIOPAddress
   35030 /7f6c264c_IIOPAddress
SQL> select /*+index(t IDX_PART_GLOBAL_FULL)*/ * from t_part t where object_id > 35000;
select /*+index(t IDX_PART_GLOBAL_FULL)*/ * from t_part t where object_id > 35000
*

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