性能优化

@@ -48,7 +48,7 @@
         limit #{rowNo},#{limit}
     </select>
     <select id="selectTotalInboxs" resultType="java.lang.Integer">
-        select count(1) from ${tableName} where uid = #{uid} and is_del='N'
+        select count(1) from ${tableName} force index(`read`) where uid = #{uid} and is_del='N'
         <if test="type != null">
             and type=#{type}
         </if>