alter session enable parallel dml; select /*+parallel(a,4)*/ * from table_name a
/*+parallel(a,4)*/ 并行处理,一般为CPU的倍数如:4,8等,在执行类型SQL必须先运行:alter session enable parallel dml.
需要注意的是10g是默认关闭的,11G是默认开启的.
alter session enable parallel dml; select /*+parallel(a,4)*/ * from table_name a