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Source code for this article: GitHub. Click here || GitEE. Click here 1. Application of Multiple Data Sources 1. Basic Description In relatively complex application services, configuring multiple data sources is a common phenomenon, such as: configuring a master-slave database to write data, and configuring a slave database to read data. This ...

1. Lock API 1. Locks package class hierarchy 2. Lock interface Method Signature describe void lock(); Acquire locks (endless) boolean tryLock(); Acquire locks (just try it) boolean tryLock(long time, TimeUnit unit) throws InterruptedException; Acquire locks (out of date) void lockInterruptibly() throws InterruptedException; Acquire ...

Statistics of the amount of data in a table is a common requirement, but different table designs and different writing methods can lead to large differences in statistical performance. Here is a simple experiment to test (everyone should pay attention to the cache when testing, otherwise the test results will be affected). 1. Preparations In or ...

Today we share with you the well-known LRU algorithm. The first lecture consists of four sections. Overview of LRU LRU usage LRU implementation Overview of Redis Near LRU Part I: Overview of LRU LRU is an abbreviation for Least Recently Used, translated as least recently used.Its rationale is that "recently used data will remain in use f ...

1. background PostgreSQL's HA schemes are generally based on its native stream replication technology, supporting synchronous replication and asynchronous replication modes.Although the synchronous replication mode can ensure the data is not lost to the greatest extent, it usually needs to deploy at least three machines to ensure that there ar ...

background From the perspective of monitoring, Secondary uses about 11GB more physical memory than Primary, For basic memory analysis, you can read this written by another student of the team first Troubleshooting documents， The user is not set to read in the standby database. There is basically no traffic in the Secondary database, only the ...

Preface Only a bare head can make it stronger. The text has been included in my GitHub selected articles. Welcome to Star: https://github.com/ZhongFuCheng3y/3y I don't know if you have written JDBC in your work. I went to a small company as an intern in my junior year. JDBC is used in it, but it encapsulates several tool classes. When ...

Integrate Mybatis <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.2</version> </dependency> Steps: 1) . configure data source related properties (see Druid in the previous section) 2) . creating tables for data ...

I often use SQL in my work, which has annoying subtle differences and limitations, but after all, it is the cornerstone of the data industry.Therefore, SQL is indispensable to every data worker.Being proficient in SQL means a lot. SQL is good, but how can you just be satisfied with "good"?Why not proceed further with SQL? Statements c ...

1, Introduction to OData Open Data Protocol (OData) is a description of how to create and access Restful Service OASIS Standard. 2, The usage of OData in asp.net mvc 1. Create a new webApi project in vs 2. Add test type public class Product { public int Id { get; set; } public string ProductName { ...