Oracle ?11g 眾多新特性中，我最喜歡的就是分區表增強，眾所周知很多大問題“化整為零”之后就不是個問題，分區表就是一種非常好用的“化整為零”的手段。

還是說回正題吧，使用Interval分區不難，為分區/子分區的重命名也不難，我的分區表大致定義如下：

1	CREATE?TABLE?Partition_Table

2

(

3

??....

4

??....

5

??....

6

)

7	PARTITION?BY?RANGE( MSGDATE ) INTERVAL( NUMTOYMINTERVAL(1,'MONTH') )

8	SUBPARTITION?BY?LIST( DAY_V )

????? 分區和子分區的重命名語法如下：

1	alter?table?<table_name> rename partition <partition_name>?to?<new_partition_name>;

2	alter?table?<table_name> rename subpartition <subpartition_name>?to?<new_subpartition_name>;

????? 每當新數據觸發新建分區后，分區名字是系統給的，雖然不影響分區表的使用，但是看著很讓人迷茫：

1

select?

2	??table_name ,

3	??partition_name,

4	??subpartition_name ,

5	??tablespace_name

6	from?user_tab_subpartitions?

7	where?subpartition_name?like?'SYS%'?;

01	TABLE_NAME???????????????????? PARTITION_NAME? SUBPARTITION_NAME? TABLESPACE_NAME

02	------------------------------ --------------- ------------------ ------------------------------

03	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP100??????? FIREWALL16

04	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP101??????? FIREWALL17

05	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP102??????? FIREWALL18

06	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP103??????? FIREWALL19

07	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP104??????? FIREWALL20

08	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP105??????? FIREWALL21

09	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP106??????? FIREWALL22

10	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP107??????? FIREWALL23

11	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP108??????? FIREWALL24

12	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP109??????? FIREWALL25

13	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP110??????? FIREWALL26

14

??

15	TABLE_NAME???????????????????? PARTITION_NAME? SUBPARTITION_NAME? TABLESPACE_NAME

16	------------------------------ --------------- ------------------ ------------------------------

17	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP111??????? FIREWALL27

18	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP112??????? FIREWALL28

19	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP113??????? FIREWALL29

20	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP114??????? FIREWALL30

21	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP115??????? FIREWALL31

22	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP85???????? FIREWALL01

23	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP86???????? FIREWALL02

24	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP87???????? FIREWALL03

25	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP88???????? FIREWALL04

26	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP89???????? FIREWALL05

27	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP90???????? FIREWALL06

28

??

29	TABLE_NAME???????????????????? PARTITION_NAME? SUBPARTITION_NAME? TABLESPACE_NAME

30	------------------------------ --------------- ------------------ ------------------------------

31	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP91???????? FIREWALL07

32	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP92???????? FIREWALL08

33	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP93???????? FIREWALL09

34	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP94???????? FIREWALL10

35	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP95???????? FIREWALL11

36	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP96???????? FIREWALL12

37	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP97???????? FIREWALL13

38	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP98???????? FIREWALL14

39	P_MYSYSLOG_IL_2010???????????? SYS_P116??????? SYS_SUBP99???????? FIREWALL15

????? 將分區/子分區的名字改成得有意義才是王道。以下是用一個過程配合游標來改分區名，重點是是從high_value字段獲得該分區的范圍描述，其他沒什么了：

01

declare?

02	?v_sql?varchar(400);

03	?v_table_name user_tab_partitions.table_name%type;

04	?v_partition_name user_tab_partitions.partition_name%type;

05	?v_high_value?varchar(200);

06	?v_tmp_partition_name user_tab_partitions.partition_name%type;

07	?cursor?cur?is?

08	???select?

09	??????table_name ,

10	??????partition_name ,

11	??????high_value?

12	????from?user_tab_partitions?

13	????where?partition_name?like?'SYS%'?;

14

begin

15	??open?cur;

16

??loop

17	????fetch?cur?into?v_table_name,v_partition_name,v_high_value;

18	????exit?when?cur%notfound;

19	????v_tmp_partition_name := substr(v_high_value,11,10);

20	????v_tmp_partition_name := to_char( to_date(v_tmp_partition_name,'yyyy-mm-dd')-1 ,?'yyyymm');

21	????v_sql :=?'alter table '||v_table_name||' rename partition '

22	??????||v_partition_name

23	??????||' to P'||v_tmp_partition_name;

24	????dbms_output.put_line( v_sql );

25	????execute?immediate v_sql;

26	??end?loop;

27	??close?cur;

28

end;

29

/

????? 由于改分區名屬于DDL語句，對于忙碌的系統來說很容易遇到ORA-00054這個錯誤：

1	ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

????? Oracle 11g 同時也引入了一個新特性——DDL Wait ，以前遇到這種情況要不就是找出那個該死的Transaction kill掉，要不就雇個人拼命堅持不懈地敲鍵盤跑這條DDL，直到成功執行，現在好了，這個人可以下崗了。只要設定ddl_lock_timeout這個參數就可以了，這個參數可以在實例級別和會話級別上設置，如果該值為0，遇到未提交事務時就會馬上報ORA-00054，如果設定為10，DDL語句會為這個事務最多等10秒，10秒內事務提交，DDL語句就會執行成功，否則10秒后再報ORA-00054。

總結

以上是生活随笔為你收集整理的给Oracle 11g Interval分区进行重命名的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。