Programmer Group

1, Overview of backup and recovery 1.1 backup function Disaster recovery: hardware failure, software failure, natural disaster, hacker attack, misoperation test and other data loss scenarios 1.2 types of backup Full backup: backs up the entire databasePartial backup: backs up a subset of the database, such as a partial library or tableI ...

1, What is an object pool Object pool is simply a software design idea that provides reusable ability for objects. We often say that it is not difficult to borrow and return, and the object pool ensures that objects can be reused through borrowing and returning, so as to save the performance overhead of frequent object creation. The most commo ...

Pay attention to the versions of different software you use. It's best to match them. If they don't match, I haven't tried, and there may be errors The memory of a single machine should be more than 2G, and 3G is the best. It should be for all the memory consumption compared on one machine. The memory service can not be started if it ...

preface The verification of background data is also an important point in development. It is used to verify the correctness of data to avoid some illegal data damaging the system or entering the database, resulting in data pollution. Since data verification may be applied to many levels, the system has strict requirements for data verification ...

Introduction and use of Gin framework Gin is a web framework written in Go language. It is an API framework similar to martini but with better performance. Due to the use of httprouter, the speed is increased by nearly 40 times. If you are a performance and efficiency seeker, you will fall in love with Gin. Go is the most popular web framew ...

What is RBAC? RBAC is a role-based permission access control. In RBAC, permissions are associated with roles. Users get the permissions of these roles by becoming members of appropriate roles, that is, permissions are bound with roles. RBAC permission management tree Role management Add role When submitting through post in a static ...

preface Spring boot devtools is a module for developers. The most important function is to automatically apply code changes to the latest App. The principle is to restart the application after finding that the code has changed, but the speed is faster than restarting after manual stop. Faster does not refer to the saved manual operation tim ...

1. Introduction to MySQL MySQL is a relational database management system developed by Swedish MySQL lab company, which is a product of Oracle. MySQL is one of the most popular relational database management systems. In terms of web application, MySQL is one of the best RDBMS(Relational Database Management System) application software. My ...

Student table: Chart of Accounts: Achievement Sheet: Data modification and deletion: 1. Renew the address of Xi'an City to Xi'an Science and Technology Second Road 2. Modify the email of S1001 to an empty string 3. Update the name of the second course to java basics, with 60 hours and a second grade class 4. Increase the S1001 and course numbe ...

Introduction to Redis database As a mature data storage middleware, Redis provides perfect data management functions, such as data expiration mentioned earlier and the data evict strategy we want to talk about today. Data locality principle The principle of locality, which runs through computer science, can clearly tell you that there are ...