Oracle分區之四：分區維護和管理

一，分區表的相關實驗
創建一個列表分區表
create table t3(id number,city varchar2(10))
partition by list(city)
(
partition p1 values ('SH','JS','ZJ') ,
partition p2 values ('BJ','TJ','HB') ,
partition p3 values ('GZ','SZ') ,
partition p_others values (default)
);
create or replace procedure proc1
as
begin
for i in 1..1000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'SH';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 1001..2000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'JS';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 2001..3000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'ZJ';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 3001..4000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'BJ';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 4001..5000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'TJ';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 5001..6000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'GZ';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 6001..7000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'HB';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 7001..8000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'SZ';
end loop;
end;
/
exec proc1
create or replace procedure proc1
as
begin
for i in 8001..10000
loop
execute immediate
'INSERT INTO T3 values(:x,:y)' USING i,'AH';
end loop;
end;
/
exec proc1
SQL> SET linesize 200
SQL> select TABLE_NAME, TABLE_OWNER, PARTITION_NAME, SUBPARTITION_COUNT from dba_tab_partitions where table_name='T3';
TABLE_NAME TABLE_OWNER PARTITION_NAME SUBPARTITION_COUNT
------------------------------ ------------------------------ ------------------------------ ------------------
T3 HR P1 0
T3 HR P2 0
T3 HR P3 0
T3 HR P_OTHERS 0

實驗一(SPLIT 分區)
alter table t3 split partition p1 values ('JS') into
(partition p1_1,partition p1_2);
SQL> select TABLE_NAME, TABLE_OWNER, PARTITION_NAME, SUBPARTITION_COUNT from dba_tab_partitions where table_name='T3';
TABLE_NAME TABLE_OWNER PARTITION_NAME SUBPARTITION_COUNT
------------------------------ ------------------------------ ------------------------------ ------------------
T3 HR P1_1 0
T3 HR P1_2 0
T3 HR P2 0
T3 HR P3 0
T3 HR P_OTHERS 0

實驗二(merge 分區)
alter table t3 merge partitions p1_1,p1_2 into partition p1;
SQL> select TABLE_NAME, TABLE_OWNER, PARTITION_NAME, SUBPARTITION_COUNT from dba_tab_partitions where table_name='T3';
TABLE_NAME TABLE_OWNER PARTITION_NAME SUBPARTITION_COUNT
------------------------------ ------------------------------ ------------------------------ ------------------
T3 HR P1 0
T3 HR P2 0
T3 HR P3 0
T3 HR P_OTHERS 0
實驗三、
alter table t3 split partition p2 values ('BJ','TJ') into
(partition p2_1,partition p2_2);
SQL> select TABLE_NAME, TABLE_OWNER, PARTITION_NAME, SUBPARTITION_COUNT from dba_tab_partitions where table_name='T3';
TABLE_NAME TABLE_OWNER PARTITION_NAME SUBPARTITION_COUNT
------------------------------ ------------------------------ ------------------------------ ------------------
T3 HR P1 0
T3 HR P2_1 0
T3 HR P2_2 0
T3 HR P3 0
T3 HR P_OTHERS 0

實驗四、
alter table t3 merge partitions p2_1,p2_2 into partition p2;
SQL> select TABLE_NAME, TABLE_OWNER, PARTITION_NAME, SUBPARTITION_COUNT from dba_tab_partitions where table_name='T3';
TABLE_NAME TABLE_OWNER PARTITION_NAME SUBPARTITION_COUNT
------------------------------ ------------------------------ ------------------------------ ------------------
T3 HR P1 0
T3 HR P2 0
T3 HR P3 0
T3 HR P_OTHERS 0
實驗五( 向分區某個分區裡增加個分區列值)
SQL> alter table t3 modify partition p3 add values('ZQ');
Table altered.
二，分區索引的相關實驗
實驗六(創建索引分區)
create index idx_t3 on t3(id)
global partition by range(id)
(
partition p1 values less than (1000),
partition p2 values less than (maxvalue)
);
drop index idx_3
create index idx_t3 on t3(id)
global partition by hash(id)
partitions 4;

create table tt2(id number,createdate date)
partition by range(createdate)
subpartition by hash(id) subpartitions 2
(
partition p1 values less than (to_date('2010-07-01','yyyy-mm-dd')),
partition p2 values less than (to_date('2011-01-01','yyyy-mm-dd'))
);

create table tt4(id number,name varchar2(10))
partition by range(name)
(
partition p1 values less than ('h'),
partition p2 values less than ('o')
);
create index idx_tt4 on tt4(id) local;
drop indexe idx_tt4 ;
create index idx_tt4 on tt4(id)
global partition by range(id)
(
partition p1 values less than (1000),
partition p2 values less than (maxvalue)
);
SQL> SET LINESIZE 200
SQL> select INDEX_OWNER, INDEX_NAME,PARTITION_NAME FROM dba_Ind_Partitions where index_name='IDX_TT4';
INDEX_OWNER INDEX_NAME PARTITION_NAME
------------------------------ ------------------------------ ------------------------------
HR IDX_TT4 P1
HR IDX_TT4 P2

alter index idx_tt4 split partition p2 at (2000) into
(partition p3,partition p_max);
SQL> select INDEX_OWNER, INDEX_NAME,PARTITION_NAME FROM dba_Ind_Partitions where index_name='IDX_TT4';
INDEX_OWNER INDEX_NAME PARTITION_NAME
------------------------------ ------------------------------ ------------------------------
HR IDX_TT4 P1
HR IDX_TT4 P3
HR IDX_TT4 P_MAX

三，分區表交換的相關實驗
Exchange partition提供了一種方式，讓你在表與表或分區與分區之間遷移數據，注意不是將表轉換成分區或非分區的形式，而僅只是遷移表中數據(互相遷移)，
由於其號稱是采用了更改數據字典的方式，因此效率最高(幾乎不涉及io操作)。Exchange partition適用於所有分區格式，你可以將數據從分區表遷移到非分區表，
也可以從非分區表遷移至分區表，或者從hash partition到range partition諸如此類。
其語法：alter table tbname1 exchange partition/subpartition ptname with table tbname2;
注意：在將未分區表的數據遷移到分區表中時，可能出現ora-14099的錯誤，雖然可以用without validation去解決，但是此時進入分區表的數據可能不符合分區規
則。所以without validation一定要慎用。
a,涉及交換的兩表之間表結構必須一致，除非附加with validation子句;
b,如果是從非分區表向分區表做交換，非分區表中的數據必須符合分區表中指定分區的規則，除非附加without validation子句;
c,如果從分區表向分區表做交換，被交換的分區的數據必須符合分區規則，除非附加without validation子句;