试题详情简答题写出索引的作用与建立索引时应注意的问题。正确答案: 索引的作用:提高数据的检索速度。 应注意的问题:对查询型的表,创建多个索引会大大提高查询速度。对更新型的表,如果索引过多,会增大开销。 答案解析:关注下方微信公众号,在线模考后查看热门试题Which two̳ To reference&eGiven: What isIdentify three scenaWhich statemenView the EGiven: Which s在CREATE DATABASE语句中,RMAN provides&以下对INSERT语句,说法错误的是()You issuedQIn which You have You are uViewtheExhibittoexam You have In which two cases wClicktheExhibitbuttoClick the You issue&ensp