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mysql delete千万数据操作_MySQL

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Release: 2016-06-01 13:33:02
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mysql delete千万数据操作

 

   在mysql中,delete掉上千万条数据时,会造成表被锁,甚至给mysql服务器带来很大压力。这是目前mysql无法避免的一个问题,可以说是在处理大数据量方面的不足。而在业务中,又无法避免这种delete需求,因此,借用oracle的思想,写存储过程,分而治之,批量删掉。

 

delimiter $$ 

create procedure sp_del_test()

begin 

declare done int default 0;

declare uid_1 int default 0;

declare i int default 0;

 

declare cur_test cursor for select uid from tmp_test_del;

declare continue handler for SQLSTATE '02000' set done=1;

open cur_test;

repeat  fetch cur_test into uid_1;

set autocommit=0;

delete from test_fenye where uid=uid_1;

set i=i+1;

if mod(i,1000)=0 then  

       commit;

end if;

until done=1 end repeat;

close cur_test;

commit;

end;

$$ 

 

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