操作分区表对global和local索引的影响 (二）
以下转自：http://blog.chinaunix.net/uid-23284114-id-3421922.html 作者：十字螺丝钉
操作分区表对global和local索引的影响 (一）请参考 http://bfc99.blog.51cto.com/265386/1436441
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> alter table 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 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,STATUS from 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 P5 25 USABLE
<2>plus "update indexes" ，同时分区中没有任何数据
SQL> alter table 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 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,STATUS from 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 into part_test values(1,'tom'); --落在p1分区
insert into part_test values(6,'lucy'); --落在p2分区
insert into part_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> alter table part_test drop partition p3;
Table altered.
global索引失效
SQL> select INDEX_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> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from 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
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_ID rebuild;
再添加几个实验分区
alter table part_test add partition p2 values less than(10);
alter table part_test add partition p3 values less than(15);
alter table part_test add partition p4 values less than(20);
insert into part_test values(6,'lucy'); --落在p2分区
insert into part_test values(11,'lucy'); --落在p3分区
SQL> alter table part_test drop partition p2 update indexes;
Table altered.
SQL> select INDEX_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,STATUS from 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 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> alter table part_test move partition p3;
Table altered.
global索引失效
SQL> select INDEX_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> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from dba_ind_partitions where INDEX_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> alter index IND_ID rebuild;
Index altered.
local索引:rebuild 失效的lcoal索引即可。
SQL> alter index IND_NAME rebuild partition p3;
Index altered.
SQL> select INDEX_NAME,PARTITION_NAME,HIGH_VALUE,STATUS from 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 P4 20 USABLE
2.分区含有数据，加update indexes
SQL> alter table part_test move partition p3 update indexes;
Table altered.
加上update indexes后，两种索引都正常。
SQL> select INDEX_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,STATUS from 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 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。
操作分区表对global和local索引的影响 (三）请参考 http://bfc99.blog.51cto.com/265386/1436445