change buffer

https://yq.aliyun.com/articles/222

change buffer:

insert buffer

delete buffer

purge buffer

1.innodb_change_buffer_max_size =25 

2.innodb_change_buffering=all 

  inserts,deletes,purges,changes,all,none

  changes:inserts ,deletes

3.innodb_change_buffering_debug=0