PostgreSQL DBA( - PG 12 Improving Partition Select

When PG 10 executes queries on partition tables, it checks the constraints of each partition one by one to see if they are needed. If many partitions are partitioned, there will be a significant performance loss during the planning phase. PG 11 improves performance by quickly identifying matched partitions through the partition pruning algorit ...

Posted on Wed, 02 Oct 2019 06:53:25 -0700 by neojordan

Implementation of Paging Technology in jsp

Paging purposes: In order to prevent the server from reading out all the data of the database at one time and improve efficiency. (The database data exists in the form of files, and it is slow to read from the hard disk) Two representations of restricted queries need to be used: limit n: Query n data fr ...

Posted on Wed, 02 Oct 2019 03:28:26 -0700 by tymlls05

Django choices Options and the Use of Rich Text Editors

Project preparation 1. Create a database create database choices_test default charset utf8; 2. Create a Django project named choices_test; 3. Create app01; The project structure is as follows 4. Configure the database; DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'choices_test', ...

Posted on Wed, 02 Oct 2019 00:04:58 -0700 by RDKL PerFecT

MySQL Database Foundation: An Example of MySQL Database Creation

Links to the original text: https://blog.51cto.com/9291927/2091340 MySQL Database Foundation (4) - An Example of MySQL Database Creation This article is reproduced from: https://blog.51cto.com/9291927/2091340. I. Creati ...

Posted on Tue, 01 Oct 2019 22:02:19 -0700 by MatthewJ

Design of MyBatis Personnel Management System Database

Sixteen entities User: The corresponding user. Dept: Corresponding departments. Job: Corresponding position. Employee: Corresponding employees. Notice: Corresponding announcements. Document: The corresponding file. II. Inter-entity relations Dept and Employee are one-to-many relationships, ...

Posted on Tue, 01 Oct 2019 19:07:51 -0700 by hrosas

Climb all the skin of heroes in the Heroes Alliance

By analyzing the hero League official page, we enter the database page and analyze the hero's page. There are two types of the same picture, one is the big picture, the other is the small picture similar to the head. Let's grab the big picture here. Get several image links and analyze https://game.gtimg ...

Posted on Tue, 01 Oct 2019 18:38:29 -0700 by plinares

Dynamic loading database connection pool

Background: For the problem of loading data sources that need to be configured in the database for SQL statements, it is impossible to load dynamically configured databases directly using external database connection pools. The simple way is to use JDBC to get configuration information separately t ...

Posted on Tue, 01 Oct 2019 18:11:56 -0700 by ajfton

spirngboot dependencies and annotations

Article directory spirngboot dependencies and annotations (2) pom file webjars dependency mysql dependency of pom file properties file mysql configuration sqlserver dependency of pom file properties file sqlserver configuration pom file mongeDB dependency properties file mongoDB configuration Neo4j ...

Posted on Tue, 01 Oct 2019 18:08:19 -0700 by john_nyc

yii2.0 privilege control ACF privilege--login authentication

ACF is a simple authorization implemented through the yii filters AccessControl class In general, we call the following in the controller:Open backend controller SiteController. PHP and we see a piece of code like this public function behaviors(){return ['access' => ['class' => AccessControl::className(),'rules' => [['actions' => ...

Posted on Tue, 01 Oct 2019 03:19:31 -0700 by amelhedi

SQL rewriting of sharding-jdbc

[Cite Official Website] In scenarios containing tables, the logical table name in the table configuration needs to be rewritten to the real table name obtained after routing. Sublibrary only does not require table name rewriting. In addition, it also includes supplement and paging information correction, as shown in the figure:       This ...

Posted on Tue, 01 Oct 2019 02:49:07 -0700 by jwalsh