忽略插入到选择重复键错误(pl/sql)

Question

我想知道是否有任何方法继续插入重复键错误后选择.含义:我想忽略该异常并继续插入下一条记录.我熟悉ignore_row_on_dupkey_index,但据我所知,不应该在生产环境中使用提示.

几件事情:1.查询将数百万条记录插入空表中.我更喜欢一个好的解决方案,对性能影响很小.

谢谢,亚历克斯

使用ignore_row_on_dupkey_index的代码示例:

CREATE TABLE customers
( customer_id number(10) NOT NULL,
  customer_name varchar2(50) NOT NULL,
  city varchar2(50),
  CONSTRAINT customers_pk PRIMARY KEY (customer_id)
);


CREATE TABLE customers_2
( customer_id number(10) NOT NULL,
  customer_name varchar2(50) NOT NULL,
  city varchar2(50)

);

insert into customers_2 values(1,'A','TLV');
insert into customers_2 values(2,'B','TLV');
insert into customers_2 values(2,'C','TLV');
insert into customers_2 values(3,'C','TLV');


SELECT * FROM customers_2

insert /*+ ignore_row_on_dupkey_index(customers, customers_pk) */
into customers select * from customers_2

select * from Customers;

Answer 1

首先,这个特定提示ignore_row_on_dupkey_index与其他提示不同.

您提到的限制通常涉及与性能调整有关的提示 - 这些提示被认为是最后的手段.

我不认为这是特定提示的情况.(见这里,这里)

但是,可以实现相同的结果 merge

merge into "customers" a
using
( 
   select * from customers_2
) b 
on (a.customer_id  = b.customer_id)
when not matched then 
  insert (customer_id , customer_name,city)
  values (b.customer_id , b.customer_name, b.city);

此外,该SO 帖中描述了另一种方法. LOG ERRORS REJECT LIMIT UNLIMITED