[12c] new features: This article will give you a detailed understanding of the automatic data optimization (ADO) of Oracle 12c database

Write in front Oracle 12c can realize information lifecycle management (ILM) through heat map and automatic data optimization (ADO). The first chapter introduces heat map. This chapter will expand automatic data optimization, and finally realize information lifecycle management through heat map and automatic data optimization. 1 automatic d ...

Posted on Wed, 27 May 2020 04:47:19 -0700 by Karamja

MySQL Pressure Test Tool

Mysqlslap: MySQL's own stress testing toolmysqlslap is the benchmark tool that comes with mysql. It queries data, has simple syntax, is flexible and easy to use. It can simulate multiple clients concurrently sending query updates to the server, gives performance test data, and provides performance comparison of various engines.mysqlslap provid ...

Posted on Tue, 26 May 2020 09:29:37 -0700 by Bramme

Using mysqldump to back up multiple libraries

mysqldump backs up multiple libraries at a time There are 20 + databases in a database instance, and 10 + of them need to be backed up in this backup. Use mysqldump to directly back up and step on a warning and an error. Database version: 5.7.26 The process is as follows: action1 mysqldump -hrm-2ze04c849v9m32bzj.mysql.rds.aliyuncs.com -uadminr ...

Posted on Tue, 26 May 2020 07:57:51 -0700 by ponies3387

php Session method instance

How to judge the user's operation authority through Session In most of the web development process, according to the actual needs, it is necessary to divide the rights of administrators and ordinary users to operate the web site. The following is a comprehensive explanation through a specific code example. (1) Design a landing page, add a form ...

Posted on Tue, 26 May 2020 02:46:38 -0700 by phpmady

[java design pattern] - strategy pattern (case analysis)

Policy Mode 1. Concepts 1. Understanding Strategic Patterns Policy mode is a behavioral mode that separates objects from behaviors and defines behaviors as an interface to behaviors and an implementation of specific behaviors.The most important feature of strategy mode is the change of behavior, which can be replaced by each other. Each ...

Posted on Mon, 25 May 2020 18:19:41 -0700 by gizmola

Kafka Quick Start-Kafka Monitoring

Kafka Quick Start (7) - Kafka Monitoring 1. Kafka Monitoring Indicators 1. Kafka host monitoring indicators Host monitoring monitors the performance of the node machine where the Kafka cluster Broker resides.Common host monitoring metrics include:(1) Machine Load(2) CPU utilization(3) Memory usage, including Free Memory and Used Memory(4) Disk ...

Posted on Mon, 25 May 2020 10:37:33 -0700 by meckr

Spring04_IOC and DI in action

For the source code of this tutorial, please visit: tutorial_demo Before learning this tutorial, you need to know (use it if you want) the following: Database connection pool c3p0; Apache Commons DbUtils. Learning without practicing is false. Next, we use the knowledge of IOC and DI learned before to combine Apache Commons DbUtils to implem ...

Posted on Mon, 25 May 2020 08:51:45 -0700 by squiblo

Mybatis Powerful Result Set Mapper resultMap

1. Preface The resultMap element is the most important and powerful element in MyBatis.It frees you from 90% of JDBC ResultSets data extraction code and allows you to perform operations that JDBC does not support in some cases.In fact, when writing mapping code for complex statements such as connections, a resultMap can replace thousands of l ...

Posted on Sat, 23 May 2020 17:54:21 -0700 by Julian Pedley

Using Ajax to submit data for data interaction between front and back stations

HTML code: <input class="form-control" id="username" name="username" type="text"/> <input class="form-control" id="password" name="password" type="password"/> <button type="button" onclick="loginSubmit()">Sign in now</button> jQuery Code: function loginSubmit() { var username = ...

Posted on Fri, 22 May 2020 08:43:56 -0700 by Alffallen

Analysis of Redis master-slave replication

How does Redis master-slave replication work? Do you know how to keep high performance while synchronizing data? https://redis.io/topics/replication Note that based on the latest version of redis 5, the slave term and configuration item have been officially changed to replica. In fact, they refer to slave nodes. Basic process of master- ...

Posted on Thu, 21 May 2020 03:19:07 -0700 by sri.sjc