https://www.interviewbit.com/problems/design-cache/ Features: This is the first part of any system design interview, coming up with the features which the system should support. As an interviewee, you should try to list down all the features you can…
Design and Implementation of Global Path Planning System for Unmanned Surface Vehicle among Multiple Task Points (针对多任务点的水面无人艇全局路径规划的设计和实现) 针对多任务点的全局路径规划,是指在存在静态障碍物的环境中,给定水面无人艇起始点.目标点以及多个任务点的情况下,设计从起始点出发,安全地遍历各个任务点,最终返回目标点的全局路径,要求行驶的航路代价总和最小. 本文主…
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel; namespace xmlTojson { [Editor(typeof(MyTestUITypeEditor),typeof(System.Drawing.Design.UITypeEditor))] [Browsable(true)] public class My…
error msg: System.Threading.Tasks.TaskCanceledException: The operation was canceled. ---> System.IO.IOException: Unable to read data from the transport connection: Operation canceled. ---> System.Net.Sockets.SocketException: Operation canceled --- E…
A first thought system architecture (pulling mode) is one that the server doesn't keep client information and the client takes a more active part in retrieving updates from the server, Note the previous model manager which is responsible for both the…
greenplum属于分布式的数据库,MPP+Share nothing的体系,查询的效率很快.不过,这是建立在数据分散均匀的基础上的.如果DK值设置不合理的话,完全有可能出现所有数据落在单个节点上的情况,这就体现不出优势来.因此,DK值的设置是否合适是建表的时候,需要考虑的重要因素之一. 查看表(table_name)的数据在节点的分布情况: select gp_segment_id,count(*) from table_name group by gp_segment_id; 如果数据有严…
alter system archive log current 是归档当前的重做日志文件,不管自动归档有没有打都归档. alter system switch logfile 是强制日志切换,不一定就归档当前的重做日志文件(若自动归档打开,就归档前的重做日志,若自动归档没有打开,就不归档当前重做日志.) 主要的区别在于:ALTER SYSTEM SWITCH LOGFILE对单实例数据库或RAC中的当前实例执行日志切换;而ALTER SYSTEM ARCHIVE LOG CURRENT会对数据…
https://dzone.com/articles/composite-design-pattern-in-java-1 The composite pattern is meant to "compose objects into a tree structure to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects un…
