Programmer Group

1. Logical paging and physical paging Logical paging: also called memory paging. Logical paging depends on the code written by the programmer. What the database returns is not the paging result, but all the data, which is then passed by the programmer The code obtains the paging data, takes out all the data, first stores it in memory, ...

1. MySQL installation (install using yum) yum install mysql* –y Linux MySQL data is stored in / var/lib/mysql by default/ [root@study ~]# cd /var/lib/mysql/ [root@study mysql]# ll //Total consumption 20488 -rw-rw----. 1 mysql mysql 10485760 5 23 23:55 ibdata1 -rw-rw----. 1 mysql mysql 5242880 5 23 23:55 ib_logfile0 -rw-rw----. 1 mysql mysql 5 ...

Weird database exception: There are mainly two abnormal sections as follows 1. Connection reset The last packet successfully received from the server was 1 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.Na ...

This paper introduces the simple application of spring boot integrating spring data JPA What is spring data jpa? We can't help thinking about it. In fact, spring data jpa uses hibernate by default and spring data jpa technology, which implements the template Dao layer. It only needs to inherit an interface in Dao to easily complete "add, d ...

Today, a question suddenly comes to mind. Is the DELETE, DROP, TRUNCATE command the same as the binlog in ROW format? It's not the same to remember vaguely, but it's not sure; so let's take a look at the experiment. MySQL:5.6.20MySQL:5.7.22 1. View binlog settings mysql> show variables like 'binlog_format'; +---------------+-------+ | Vari ...

Last article( https://www.cnblogs.com/meowv/p/12909558.html )Improved the code in the project and connected to Swagger. This article mainly uses the Entity Framework Core to access the database, and uses the code first method for data migration and automatic creation of table structure. data access Add our data access context object MeowvBl ...

I believe that many small partners have seen the response time and real-time display function of url interface in some commercial products. It can be understood that the slow query of web interface and the slow query of sql have the same magic, but if you want to do it, you have no way to start and don't know how to realize this function, so to ...

Now I want to compare the differences before and after php web page execution, but I still can't find better software Add, delete, and change the kind that is recorded. Then MySQL 5 is discovered by browsing the official documentation.1 has one Common Query Log .So try: #cd /Applications/XAMPP/xamppfiles/bin cd /Appl ...

Redis has five basic types: string, list, Hash, set and sorted set. This time, the common operations of Hash are listed. Redis official website: https://redis.io/    1, Hash introduction Hash is the basic type in Redis. A key corresponds to a set, in which a dictionary is formed in the form of field value. It can be understood that in a di ...

This installation of Mysql's EnOS version is 7.7 1. Download Mysql First go to Mysql's website to download the installation package, web address https://dev.mysql.com/downloads/mysql/ It is recommended that you download the common version of Linux for easy administration of installation location and installation of multiple versions of MySQL on ...