explain使用:
explain select * from e3_eval_domain_cn where srcId <1000
創建索引:
create index index_name on table_name(column1,column2 ...);
刪除索引:
drop index index_name on table_name ;
explain使用:
explain select * from e3_eval_domain_cn where srcId <1000
創建索引:
create index index_name on table_name(column1,column2 ...);
刪除索引:
drop index index_name on table_name ;