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Java notes One of the object-oriented features: encapsulation and hiding Four access modifiers Member 3 of class: constructor (constructor) Constructor Overload Keywords - this JavaBean One of the object-oriented features: encapsulation and hiding The user's direct operation on the properties ...

In the process of performance test, we often encounter the performance bottleneck of Mysql. For the database, the so-called performance bottleneck is nothing more than slow SQL, high CPU, high IO, and high memory. The first three examples are used for performance analysis. Finally, the high memory is ...

Prometheus Introduction to Prometheus Prometheus is an open source monitoring, alarm, and time series database project developed by SoundCloud, which collects indicators that need statistics by pulling interfaces periodically The basic principle of Prometheus is to periodically capture the status of ...

Lifecycle requested in Django 1. Overview First, we know that all data transferred in HTTP requests and server responses is strings. In Django, when we visit a url, we enter the corresponding html page through route matching. Django's request life cycle is what happens behind the scenes when a user enters a url into the browser and the user see ...

There are many ways to connect hive and impala in python, including pyhive,impyla,pyspark,ibis, etc. in this article, we will introduce how to use these packages to connect hive or impala, and how to pass kerberos authentication. Kerberos If the cluster does not enable kerberos authentication, the ...

Recently, we are introducing distributed transaction technology for the project. At present, Seata is a good choice. I plan to take a look at it. This article is purely a personal learning note, without any responsibility. In this article, nacos-1.2.0, SpringBoot-2.3.0, seata-1.2.0, mysql-5.7 are use ...

Author: giant brother cnblogs.com/jurendage/p/11255197.html background In the process of software development, it is inevitable to deal with all kinds of exceptions. For myself, at least half of the time is spent dealing with all kinds of exceptions, so there will be a lot of try {...} catch {...} finally {...} code blocks in the code, which ...

1. MySQL Read-Write Separation Concept The principle of MYSQL read-write separation is to let Master database handle transactional add, delete, modify, update operations (create, insert, update, delete) and Slave database handle query operations (select). MySQL read-write separation is based on MySQL master-slave replication, which can guarant ...

Let's face it, enum (enumeration) is a keyword introduced in Java 1.5. It represents a special type of class. By default inherit From java.lang.Enum . To prove this, let's create a new enumeration player type: public enum PlayerType { TENNIS, FOOTBALL, BASKETBALL } There are two keywords w ...

View mysql profile address mysql --help|grep 'my.cnf' ps aux|grep mysql|grep 'my.cnf' The configuration is divided into two parts, the master server part and the slave server part In this test, the master and slave of the two machines are synchronized, and the environment is windows (the same as Linux) Main server ip:192.168.1.199 Slave serve ...