by http://blog.chinaunix.net/uid-23284114-id-3421922.html
分類： Oracle
使用分區表，要非常注意索引。因爲刪除、move分區都會造成索引失效。小表的索引和非主鍵、唯一建索引還好，重建即可。
如果是幾十G的表，重建索引花費巨大，會嚴重影響查詢性能;
如果是主鍵或者唯一鍵索引，索引失效會插入重複的數據，帶來的麻煩更大。
所以，我們一定要重視分區表操作，避免引起索引失效。
哪些操作會引起索引失效？
ADDPARTITION | SUBPARTITION (hash)
COALESCE PARTITION | SUBPARTITION (hash)
DROPPARTITION | SUBPARTITION
EXCHANGE PARTITION | SUBPARTITION
MERGE PARTITION | SUBPARTITION
MOVE PARTITION | SUBPARTITION
SPLIT PARTITION | SUBPARTITION
TRUNCATE PARTITION | SUBPARTITION
上面所有操作都會引起global索引失效;
其中下面的操作會引起local索引失效。
MERGE PARTITION
MOVE PARTITION
SPLIT PARTITION
COALESCE PARTITION
EXCHANGE PARTITION
怎麼解決索引失效問題，那就是加上update indexes
加上update indexes，以上任何操作不會引起glocal索引失效;
加上update indexes，以上操作中除了EXCHANGE PARTITION操作以外，不會引起local 索引失效。
*EXCHANGE PARTITION操作是個很特殊的操作，加上update indexes參數，EXCHANGE PARTITION依然會造成local 索引失效。
需要注意的是，如果分區中不含數據，上面的操作都不會引起索引失效（EXCHANGE PARTITION除外）。
下面是實驗過程：
注意：
本實驗都是range分區
準備基表,id列作爲分區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、準備基表及索引
global和local信息不在同一個數據字典中;
global索引信息==>dba_indexes
local索引信息==>dba_ind_partitions/user_ind_partitions
*可以通過dba_indexes判斷索引類型，如果status等於VALID或者UNUSABLE，索引類型是global;
status等於N/A，索引則是local索引。
1.建索引
創建global索引
create indexind_id on part_test(id);
創建local索引
create indexind_name on part_test(name) local;
PART_TEST上兩個索引名、表名、及索引狀態值
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.索引狀態值
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.
索引同樣都可用
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
結論：add partition時，不加update indexes不會破壞local及global索引的可用性;當然，加上update indexes更好更保險。
三、drop partition
1.刪除沒有數據的分區
<1>not plus"update indexes" ，同時分區中沒有任何數據
SQL> altertable part_test drop partition p4;
Table altered.
刪除分區後，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" ，同時分區中沒有任何數據
SQL> altertable part_test drop partition p5 update indexes;
Table altered.
刪除分區後，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
小結：分區中沒有數據，不加update index ，drop該索引也不會引起local及global索引失效。
2.刪除含有數據的分區
insert intopart_test values(1,'tom'); --落在p1分區
insert intopart_test values(6,'lucy'); --落在p2分區
insert intopart_test values(11,'lucy'); --落在p3分區
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
小結：分區中含有數據，刪除分區會造成global索引失效;而local 索引正常。
<2>plus"update indexes"
首先修復global索引IND_ID,通過rebuild
alter index IND_IDrebuild;
再添加幾個實驗分區
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分區
insert intopart_test values(11,'lucy'); --落在p3分區
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
小結：分區中含有數據，不加update indexes，會造成global索引失效，而local索引不受影響。
四、move partition
1.分區含有數據，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
分區對應的local索引失效，而其他分區的local索引不受影響。
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
恢復失效索引
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.分區含有數據，加update indexes
SQL> altertable part_test move partition p3 update indexes;
Table altered.
加上update indexes後，兩種索引都正常。
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
小結：分區中含有數據，move分區會造成global和分區對應local索引失效；加上update indexes參數能夠避免這個問題。
五、truncate partition
1.分區含有數據，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.分區含有數據，加update indexes
SQL> insertinto part_test values(11,'lucy'); --落在p3分區
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後，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
小結：分區表中含有數據，truncate partition會造成global索引失效;truncate partition加上update indexes可用避免這種情況。
六、SPLIT PARTITION（一個分區分裂爲多個分區)
準備實驗分區
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，原分區和分裂出的新分區都不可用。
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後，分裂不會造成索引失效。
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
小結：split partition操作，會使global索引和local索引的原分區和分裂出的新分區都不可用。加上update indexes解決這個問題。
七、merge partition(合併分區)
現有分區
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分區都含有數據，把他們合併爲p6分區
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
新生成的分區的索引是失效的。
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 （收縮表分區）
僅能應用在hash 分區表，執行一次就少一個分區，如一個hash分區表含有3個分區，COALESCE PARTITION 一次就成了2個分區。
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.下面進行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
修復索引
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.
操作後，索引沒有失效。
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是表與表，表與分區，分區與分區數據交換的命令，不是將錶轉換成分區，或者分區轉換成表
依然用上面的part_test分區表
SQL> select *from PART_TEST partition(p6);
ID NAME
--------------------
18 ok
21 john
21 jodan
新建一個表exchange_test
create tableexchange_test(id number,name varchar2(10));
下面把PART_TEST partition(p6)中的數據exchange到exchange_test中
SQL> altertable PART_TEST exchange partition p6 with table exchange_test;
Table altered.
p6分區沒有數據了
SQL> select *from PART_TEST partition(p6);
no rows selected
數據跑到了exchange_test中。
SQL> select *from exchange_test;
ID NAME
--------------------
18 ok
21 john
21 jodan
看分區表索引情況，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
恢復索引
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;
數據又回去了
SQL> select *from exchange_test;
no rows selected
SQL> select *from PART_TEST partition(p6);
ID NAME
--------------------
18 ok
21 john
21 jodan
看索引情況
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索引還是失效了。
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
小結：加上update indexes，global索引不失效，但是local 索引依然失效。
十、重命名分區和local索引名字都不會影響索引狀態
SQL> altertable part_test rename partition P6 to p5;
SQL> alterindex IND_NAME rename partition P6 to p5;
注意：
local索引不能整個rebuild，要rebuild索引分區。
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索引大面積不可用，那麼用動態sql生成重語句吧
SQL> select'alter index INDEX_NAME rebuild partition '||PARTITION_NAME||';' fromuser_ind_partitions where INDEX_NAME='INDEX_NAME' and STATUS='UNUSABLE';