Batch Delete scripts for large tables: MySQL version; Delete scripts for mysql

Batch Delete scripts for large tables: MySQL version; Delete scripts for mysql

It is often necessary to regularly Delete historical data from some tables. The data in such tables is usually very huge. To reduce the impact on the online environment, the deletion must be divided into small batches.

I have previously shared the SQLServer version.

The following is the MySQL version:

1 delimiter $2 drop procedure if exists proc_delete_old_data; 3 create procedure proc_delete_old_data () 4 begin 5 lp: loop 6 delete from mytable where createdtime <= date_sub (curdate (), interval 1 month) limit 5000; 7 if row_count () <5000 then 8 leave lp; 9 end if; 10 select sleep (1); 11 end loop; 12 end $13 14 delimiter; 15 set binlog_format = STATEMENT; 16 call proc_delete_old_data;

Address: http://www.cnblogs.com/ajiangg/p/6604317.html