oracle reference partition引用分割槽(一)

SQL> create table t_hash_partition_parent(a int primary key,b int)
  2  partition by hash(a)
  3  partitions 2
  4
SQL> /

Table created.

---報錯原因:a int後應有,號
SQL> create table t_reference_partition(id int primary key,a int constraint fk_a
 foreign key(a), references t_hash_partition_parent(a))
  2  partition by reference(fk_a)
  3  /
create table t_reference_partition(id int primary key,a int constraint fk_a fore
ign key(a), references t_hash_partition_parent(a))
                                                            *
ERROR at line 1:
ORA-02253: constraint specification not allowed here

---掃錯原因:外來鍵列必須是not null
SQL> ed
Wrote file afiedt.buf

  1  create table t_reference_partition(id int primary key,a int constraint fk_a
 foreign key(a), references t_hash_partition_parent(a))
  2* partition by reference(fk_a)
SQL> create table t_reference_partition(id int primary key,a int,constraint fk_a
 foreign key(a) references t_hash_partition_parent(a))
  2  partition by reference(fk_a)
  3  /
partition by reference(fk_a)
                       *
ERROR at line 2:
ORA-14652: reference partitioning foreign key is not supported

SQL> ed
SQL> create table t_reference_partition(id int primary key,a int not null,constr
aint fk_a foreign key(a) references t_hash_partition_parent(a))
  2  partition by reference(fk_a)
  3  /

Table created.

-----分表的分割槽數
SQL> select partition_name from user_tab_partitions where table_name='T_HASH_PAR
TITION_PARENT';

PARTITION_NAME
------------------------------------------------------------
SYS_P43
SYS_P44

---引用分割槽的分割槽表,結論:引用分割槽的分割槽表取決於父分割槽表的分割槽個數
SQL> select partition_name from user_tab_partitions where table_name='T_REFERENC
E_PARTITION';

PARTITION_NAME
------------------------------------------------------------
SYS_P45
SYS_P46

-----引用分割槽之constraint使用說明:

---引用分割槽必須要引用外來鍵約束,且主分割槽表的父鍵必須構建pk或unique constraint,同時要滿足enable validate not deferenable
You must specify a referential integrity constraint defined on the table being created, which must refer to a primary key or unique constraint on the parent table.
The constraint must be in ENABLE VALIDATE NOT DEFERRABLE state, which is the default when you specify a referential integrity constraint during table creation.
 
---所有引用的外來鍵必須定義為not null
All foreign key columns referenced in constraint must be NOT NULL.
 
---如指定約束,不能再指定on delete set null;即在操作父表時,不能同時設定匹配子表的記錄為空
When you specify the constraint, you cannot specify the ON DELETE SET NULL clause of the references_clause.
 
---所引用的父表必須是分割槽表;且父表分表方法不能是interval mode
The parent table referenced in the constraint must be an existing partitioned table. It can be partitioned by any method except interval partitioning.
 
---引用分割槽和父分割槽表所引用的外來鍵及父鍵絕不能包含基於pl sql function or lob列的虛擬列
The foreign and parent keys cannot contain any virtual columns that reference PL/SQL functions or LOB columns.

 

---引用分割槽的操作限制:

-----引用分割槽約束取決於父分割槽表的分割槽策略,即父分割槽是什麼分割槽型別,它就隸屬於什麼分割槽型別
Restrictions for reference partitioning are derived from the partitioning strategy of the parent table.
 
----iot,外部表,域索引儲存表不能使用引用分割槽
You cannot specify this clause for an index-organized table, an external table, or a domain index storage table.
 
----父分割槽表也可以是引用分割槽,但約束不能是自包含
The parent table can be partitioned by reference, but constraint cannot be self-referential. The table being created cannot be partitioned based on a reference to itself.
 
----如父分割槽表啟用了行移動,引用分割槽也須啟行移動
If ROW MOVEMENT is enabled for the parent table, it must also be enabled for the child table.