操作分区表对global和local索引的影响

by http://blog.chinaunix.net/uid-23284114-id-3421922.html

分类： Oracle

使用分区表，要非常注意索引。因为删除、move分区都会造成索引失效。小表的索引和非主键、唯一建索引还好，重建即可。

如果是几十G的表，重建索引花费巨大，会严重影响查询性能;

如果是主键或者唯一键索引，索引失效会插入重复的数据，带来的麻烦更大。

所以，我们一定要重视分区表操作，避免引起索引失效。

哪些操作会引起索引失效？

ADDPARTITION | SUBPARTITION (hash)

COALESCE PARTITION | SUBPARTITION (hash)

DROPPARTITION | SUBPARTITION

EXCHANGE PARTITION | SUBPARTITION

MERGE PARTITION | SUBPARTITION

MOVE PARTITION | SUBPARTITION

SPLIT PARTITION | SUBPARTITION

TRUNCATE PARTITION | SUBPARTITION

上面所有操作都会引起global索引失效;

其中下面的操作会引起local索引失效。

MERGE PARTITION

MOVE PARTITION

SPLIT PARTITION

COALESCE PARTITION

EXCHANGE PARTITION

怎么解决索引失效问题，那就是加上update indexes

加上update indexes，以上任何操作不会引起glocal索引失效;

加上update indexes，以上操作中除了EXCHANGE PARTITION操作以外，不会引起local 索引失效。

*EXCHANGE PARTITION操作是个很特殊的操作，加上update indexes参数，EXCHANGE PARTITION依然会造成local 索引失效。

需要注意的是，如果分区中不含数据，上面的操作都不会引起索引失效（EXCHANGE PARTITION除外）。

下面是实验过程：

注意：

本实验都是range分区

准备基表,id列作为分区key

create tablepart_test(id number,name varchar2(10))

partition by range(id)

(

partition p1values less than (5),

partition p2values less than (10),

partition p3values less than (15)

);

SQL> selecttable_name,partition_name,HIGH_VALUE from dba_tab_partitions wheretable_name='PART_TEST' order by table_name,partition_name;

TABLE_NAME PARTITION_NAME HIGH_VALUE

--------------------------------------------------------------------------------------------------------------------------------------------

PART_TEST P1 5

PART_TEST P2 10

PART_TEST P3 15

一、准备基表及索引

global和local信息不在同一个数据字典中;

global索引信息==>dba_indexes

local索引信息==>dba_ind_partitions/user_ind_partitions

*可以通过dba_indexes判断索引类型，如果status等于VALID或者UNUSABLE，索引类型是global;

status等于N/A，索引则是local索引。

1.建索引

创建global索引

create indexind_id on part_test(id);

创建local索引

create indexind_name on part_test(name) local;

PART_TEST上两个索引名、表名、及索引状态值

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where table_name='PART_TEST';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID --global index

IND_NAME DOWNLOAD N/A --local index

2.索引状态值

查看global索引ind_id 信息

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

查看local索引IND_NAME信息

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

------------------------------------------------------------ ----------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

IND_NAME P3 15 USABLE

二、add partition

1.not plus"update indexes"

SQL> altertable part_test add partition p4 values less than (20);

Table altered.

索引都可用

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20

2. plus "update indexes"

SQL> alter table part_test add partition p5 valuesless than (25) update indexes;

Table altered.

索引同样都可用

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUSfrom dba_ind_partitions where INDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

------------------------------------------------------------ ----------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

IND_NAME P5 25 USABLE

结论：add partition时，不加update indexes不会破坏local及global索引的可用性;当然，加上update indexes更好更保险。

三、drop partition

1.删除没有数据的分区

<1>not plus"update indexes" ，同时分区中没有任何数据

SQL> altertable part_test drop partition p4;

Table altered.

删除分区后，索引依然可用。

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

IND_NAME P3 15 USABLE

IND_NAME P5 25 USABLE

<2>plus"update indexes" ，同时分区中没有任何数据

SQL> altertable part_test drop partition p5 update indexes;

Table altered.

删除分区后，索引依然可用。

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUSfrom dba_ind_partitions where INDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

IND_NAME P3 15 USABLE

小结：分区中没有数据，不加update index ，drop该索引也不会引起local及global索引失效。

2.删除含有数据的分区

insert intopart_test values(1,'tom'); --落在p1分区

insert intopart_test values(6,'lucy'); --落在p2分区

insert intopart_test values(11,'lucy'); --落在p3分区

SQL> select *from part_test partition(p1);

ID NAME

--------------------

1 tom

SQL>

SQL> select * from part_test partition(p2);

ID NAME

--------------------

6 lucy

SQL> select * from part_test partition(p3);

ID NAME

--------------------

11 lucy

<1>not plus"update indexes"

SQL> altertable part_test drop partition p3;

Table altered.

global索引失效

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

local索引正常

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P2 10 USABLE

小结：分区中含有数据，删除分区会造成global索引失效;而local 索引正常。

<2>plus"update indexes"

首先修复global索引IND_ID,通过rebuild

alter index IND_IDrebuild;

再添加几个实验分区

alter tablepart_test add partition p2 values less than(10);

alter tablepart_test add partition p3 values less than(15);

alter tablepart_test add partition p4 values less than(20);

insert intopart_test values(6,'lucy'); --落在p2分区

insert intopart_test values(11,'lucy'); --落在p3分区

SQL> altertable part_test drop partition p2 update indexes;

Table altered.

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

------------------------------------------------------------ ----------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

小结：分区中含有数据，不加update indexes，会造成global索引失效，而local索引不受影响。

四、move partition

1.分区含有数据，不加update indexes

SQL> altertable part_test move partition p3;

Table altered.

global索引失效

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

分区对应的local索引失效，而其他分区的local索引不受影响。

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 UNUSABLE

IND_NAME P4 20 USABLE

恢复失效索引

global 索引

SQL> alterindex IND_ID rebuild;

Index altered.

local索引:rebuild 失效的lcoal索引即可。

SQL> alterindex IND_NAME rebuild partition p3;

Index altered.

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

2.分区含有数据，加update indexes

SQL> altertable part_test move partition p3 update indexes;

Table altered.

加上update indexes后，两种索引都正常。

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

小结：分区中含有数据，move分区会造成global和分区对应local索引失效；加上update indexes参数能够避免这个问题。

五、truncate partition

1.分区含有数据，不加update indexes

SQL> altertable part_test truncate partition p3;

Table truncated.

global索引失效不可用

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

local索引依然可用

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

2.分区含有数据，加update indexes

SQL> insertinto part_test values(11,'lucy'); --落在p3分区

1 row created.

SQL> commit;

Commit complete.

重建global索引

SQL> alterindex IND_ID rebuild;

Index altered.

SQL> altertable part_test truncate partition p3 update indexes;

Table truncated.

加上update indexes后，global索引不再失效。

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

小结：分区表中含有数据，truncate partition会造成global索引失效;truncate partition加上update indexes可用避免这种情况。

六、SPLIT PARTITION（一个分区分裂为多个分区)

准备实验分区

SQL> altertable part_test add partition max_part values less than(maxvalue);

Table altered.

SQL> insertinto part_test values(21,'john');

1 row created.

SQL> insert into part_test values(30,'dog');

1 row created.

SQL> commit;

Commit complete.

SQL> select * from part_test partition(MAX_PART);

ID NAME

--------------------

21 john

30 dog

1.不加update indexes

SQL> altertable part_test split partition max_part at (25) into (partition p5,partitionmax_part );

Table altered.

global索引不可用

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

local索引，原分区和分裂出的新分区都不可用。

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

IND_NAME P5 25 UNUSABLE

IND_NAME MAX_PART MAXVALUE UNUSABLE

2.加update indexes

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

IND_NAME MAX_PART MAXVALUE USABLE

SQL> altertable part_test split partition max_part at (25) into (partition p5,partitionmax_part ) update indexes;

Table altered.

加update indexes后，分裂不会造成索引失效。

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P4 20 USABLE

IND_NAME P5 25 USABLE

IND_NAME MAX_PART MAXVALUE USABLE

小结：split partition操作，会使global索引和local索引的原分区和分裂出的新分区都不可用。加上update indexes解决这个问题。

七、merge partition(合并分区)

现有分区

SQL> select table_name,partition_name,HIGH_VALUEfrom dba_tab_partitions where table_name='PART_TEST' order by PARTITION_NAME;

TABLE_NAME PARTITION_NAME HIGH_VALUE

--------------------------------------------------------------------------------------------------------------------------------------------

PART_TEST MAX_PART MAXVALUE

PART_TEST P1 5

PART_TEST P3 15

PART_TEST P4 20

PART_TEST P5 25

p4和p5分区都含有数据，把他们合并为p6分区

1.不加update indexes

SQL> alter table PART_TEST merge partitions p4,p5into partition p6;

Table altered.

global索引失效

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

新生成的分区的索引是失效的。

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

------------------------------------------------------------ ----------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P6 25 UNUSABLE

IND_NAME MAX_PART MAXVALUE USABLE

2.加update indexes

SQL> altertable PART_TEST merge partitions p4,p5 into partition p6 update indexes;

Table altered.

global和local索引都正常。

SQL>SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

SQL> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUSfrom dba_ind_partitions where INDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

------------------------------------------------------------ ----------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P6 25 USABLE

IND_NAME MAX_PART MAXVALUE USABLE

八、COALESCE PARTITION （收缩表分区）

仅能应用在hash 分区表，执行一次就少一个分区，如一个hash分区表含有3个分区，COALESCE PARTITION 一次就成了2个分区。

create tablepart_hash(id number,name nvarchar2(20))

partition byhash(id)

(

partition p1,

partition p2,

partition p3,

partition p4

);

create indexind_hash_id on part_hash(id);

create indexind_hash_name on part_hash(name) local;

insert intopart_hash values(1,'tom');

insert intopart_hash values(2,'lucy');

insert intopart_hash values(3,'john');

insert intopart_hash values(4,'kate');

索引信息

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_HASH_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_HASH_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_HASH_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_HASH_NAME P1 USABLE

IND_HASH_NAME P2 USABLE

IND_HASH_NAME P3 USABLE

IND_HASH_NAME P4 USABLE

表信息

SQL> select table_name,partition_name,HIGH_VALUEfrom dba_tab_partitions where table_name='PART_HASH' order bytable_name,partition_name;

TABLE_NAME PARTITION_NAME HIGH_VALUE

--------------------------------------------------------------------------------------------------------------------------------------------

PART_HASH P1

PART_HASH P2

PART_HASH P3

PART_HASH P4

1.下面进行coalesce partiton操作,不加update index

SQL> altertable PART_HASH coalesce partition;

Table altered.

操作引起global和local索引失效。

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_HASH_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_HASH_ID DOWNLOAD UNUSABLE

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_HASH_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_HASH_NAME P1 USABLE

IND_HASH_NAME P2 UNUSABLE

IND_HASH_NAME P3 USABLE

修复索引

alter indexIND_HASH_ID rebuild;

alter indexIND_HASH_NAME rebuild partition p2;

2.加update indexes

SQL> alter table PART_HASH coalesce partitionupdate indexes;

Table altered.

操作后，索引没有失效。

SQL> selectINDEX_NAME,TABLE_OWNER,STATUS from dba_indexes where index_name='IND_HASH_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_HASH_ID DOWNLOAD VALID

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_HASH_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_HASH_NAME P1 USABLE

IND_HASH_NAME P2 USABLE

九、exchange partition

exchange partition是表与表，表与分区，分区与分区数据交换的命令，不是将表转换成分区，或者分区转换成表

依然用上面的part_test分区表

SQL> select *from PART_TEST partition(p6);

ID NAME

--------------------

18 ok

21 john

21 jodan

新建一个表exchange_test

create tableexchange_test(id number,name varchar2(10));

下面把PART_TEST partition(p6)中的数据exchange到exchange_test中

SQL> altertable PART_TEST exchange partition p6 with table exchange_test;

Table altered.

p6分区没有数据了

SQL> select *from PART_TEST partition(p6);

no rows selected

数据跑到了exchange_test中。

SQL> select *from exchange_test;

ID NAME

--------------------

18 ok

21 john

21 jodan

看分区表索引情况，global索引失效，p6上的local索引失效。

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD UNUSABLE

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P6 25 UNUSABLE

IND_NAME MAX_PART MAXVALUE USABLE

恢复索引

alter index IND_IDrebuild;

alter indexIND_NAME rebuild partition p6;

2.加update indexes

SQL> altertable PART_TEST exchange partition p6 with table exchange_test update indexes;

数据又回去了

SQL> select *from exchange_test;

no rows selected

SQL> select *from PART_TEST partition(p6);

ID NAME

--------------------

18 ok

21 john

21 jodan

看索引情况

global索引正常

SQL> select INDEX_NAME,TABLE_OWNER,STATUS fromdba_indexes where index_name='IND_ID';

INDEX_NAME TABLE_OWNER STATUS

------------------------------------------------------------ --------

IND_ID DOWNLOAD VALID

local索引还是失效了。

SQL> selectINDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions whereINDEX_NAME='IND_NAME';

INDEX_NAME PARTITION_NAME HIGH_VALUE STATUS

----------------------------------------------------------------------------------------------------------------------------------------------------

IND_NAME P1 5 USABLE

IND_NAME P3 15 USABLE

IND_NAME P6 25 UNUSABLE

IND_NAME MAX_PART MAXVALUE USABLE

小结：加上update indexes，global索引不失效，但是local 索引依然失效。

十、重命名分区和local索引名字都不会影响索引状态

SQL> altertable part_test rename partition P6 to p5;

SQL> alterindex IND_NAME rename partition P6 to p5;

注意：

local索引不能整个rebuild，要rebuild索引分区。

SQL> alterindex IND_NAME rebuild;

alter indexIND_NAME rebuild

ERROR at line 1:

ORA-14086: apartitioned index may not be rebuilt as a whole

SQL> alterindex IND_NAME rebuild partition MAX_PART;

Index altered.

如果local索引大面积不可用，那么用动态sql生成重语句吧

SQL> select'alter index INDEX_NAME rebuild partition '||PARTITION_NAME||';' fromuser_ind_partitions where INDEX_NAME='INDEX_NAME' and STATUS='UNUSABLE';

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