Programming VIP

#oracle19c Oracle 19C download address Baidu online disk link: https://pan.baidu.com/s/1mtsWs3dibid4vwFwuv08iQ Extraction code: poi2 Install dependent packages [root@karms ~]# cat /etc/redhat-release CentOS Linux release 7.0.1406 (Core)[root@karms ~]# yum install -y compat-libcap1 compat-libstdc++-33 gcc-c++ ksh libaio-devel libstdc++-deve ...

Background: Online migration of the current ES cluster to a new machine Current: ES designs a load balancing mechanism for cluster fragmentation. When new nodes join or leave the cluster, the cluster will automatically balance the load distribution of fragmentation Migration target: smooth migration Migration strategy: Turning off cluster auto ...

View ifconfig of docker server docker network principle Docker uses Linux bridging. A docker container bridge (docker0) is virtualized in the host. When docker starts a container, it will assign an IP address to the container according to the network segment of docker bridge, which is called container IP. At the same time, docker bridge ...

1, View View is a virtual table (non real). Its essence is to obtain a dynamic data set according to SQL statements and name it. When using, users only need to use the name to obtain the result set, which can be used as a table. Using the view, we can pick out the temporary table in the query process and implement it with the view. In t ...

Freemaker generates word templates 1, Introduce dependency <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.28</version> </dependency> 2, Tool class Note: for the attribute of Configuration configuration, in some cases, the file grammar wil ...

I summary What is RPC? Remote service callOfficial: the idea of requesting services from remote computer programs through the network without understanding the underlying network technologyA little more popular: without knowing the details of the call, the client calls an object that exists on the remote computer, just like calling an objec ...

GoLang's slice bottom layer and expansion rules 1. Structure In the first part, where are the elements stored? In the second part, how many elements are stored and how many elements can be stored 2. Variable declaration int type slice For example, declare an [] int, and the variable ints is composed of three parts on the right. The el ...

SQL, namely structured query language, is a database query and programming language, which is used to access data and query, update and manage relational database system; SQL language is the widely used standard language of relational database and the basis of various database interaction methods. The following will show how to use SQL to acces ...

1. Introduction to Shiro Apache Shiro is an open source security framework that provides authentication, authorization, cryptography, and session management. Shiro framework is intuitive and easy to use. At the same time, it can also provide robust security. Although its function is not as powerful as spring security, it is still enough in ord ...

Method of modifying root password in MySQL As the first barrier to database security, the root account and its password. Learning to manage the root password is undoubtedly a basic skill for the gatekeeper and the unlocking man. Know the password When the password is known, you can log in to the MySQL database and modify it through alter ...