【MongoDB】MongoDB之遗漏知识点
截止目前,已经看过mongodb书籍三本了,今天看由美国 Kristina Chodorow著《MongoDB 权威指南》时候,发现还是有许多知识有遗漏;现在做个补充; 一、删除速度 删除文档通常很快,但是如果清空整个集合比较慢,那么使用drop直接删除集合会快; 现在创建多于1
截止目前,已经看过mongodb书籍三本了,今天看由美国 Kristina Chodorow著《MongoDB 权威指南》时候,发现还是有许多知识有遗漏;现在做个补充;
一、删除速度
删除文档通常很快,但是如果清空整个集合比较慢,那么使用drop直接删除集合会快;
现在创建多于10w的测试记录:
注意用db.tester.drZ喎?http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">vcKOoo6m0+szmcmVtb3Zlus1maW5kb25lo6zL2bbIzOHJ/cHLtavKx9PQtPq827XEo6yyu8Tc1ri2qMjOus6y6dGvzPW8/qOs1fu49ryvus+2vLG7yb2z/cHLo6zL+dPQ1KrK/b7dtryyu7z7wcuhoyBSZW1vdmW688v30v3V4tCptryyu7Hko7s8L3A+CjxoMz62/qGit7W72Mr91+nUqsvYPC9oMz4KPHA+yOe5+9aqtcDUqsvYtcTPwrHqo6zEx8O008OhsCRzbGljZaGxt8ezo9PQ08Oho7Wr09DKsc7Sw8fPo837t7W72NPrsunRr8z1vP7P4MalxeS1xMjOus7Su7j2yv3X6dSqy9iho7P1yry7r9K7zPW8x8K8o6zLtcP30rvPwnNsaWNltcTTw7eoo7o8L3A+CjxwPjxpbWcgc3JjPQ=="http://www.2cto.com/uploadfile/Collfiles/20141215/2014121510033646.png" alt="\">

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



Solutions to resolve Navicat expiration issues include: renew the license; uninstall and reinstall; disable automatic updates; use Navicat Premium Essentials free version; contact Navicat customer support.

For front-end developers, the difficulty of learning Node.js depends on their JavaScript foundation, server-side programming experience, command line familiarity, and learning style. The learning curve includes entry-level and advanced-level modules focusing on fundamental concepts, server-side architecture, database integration, and asynchronous programming. Overall, learning Node.js is not difficult for developers who have a solid foundation in JavaScript and are willing to invest the time and effort, but for those who lack relevant experience, there may be certain challenges to overcome.

To connect to MongoDB using Navicat, you need to: Install Navicat Create a MongoDB connection: a. Enter the connection name, host address and port b. Enter the authentication information (if required) Add an SSL certificate (if required) Verify the connection Save the connection

The most commonly used modules in Node.js include: File system module for file operations Network module for network communication Stream module for processing data streams Database module for interacting with databases Other utility modules such as encryption, query strings String parsing and HTTP framework

For Node.js applications, choosing a database depends on the application requirements. NoSQL databases MongoDB provide flexibility, Redis provides high concurrency, Cassandra handles time series data, and Elasticsearch is dedicated to search. SQL database MySQL has excellent performance, PostgreSQL is feature-rich, SQLite is lightweight, and Oracle Database is comprehensive. When choosing, consider data types, queries, performance, transactionality, availability, licensing, and cost.

Connecting to a database in Node.js requires choosing a database system (relational or non-relational) and then establishing a connection using modules specific to that type. Common modules include mysql (MySQL), pg (PostgreSQL), mongodb (MongoDB), and redis (Redis). After the connection is established, you can use query statements to retrieve data and update statements to modify the data. Finally, the connection must be closed when all operations are completed to release resources. Improve performance and security by following these best practices, such as using connection pooling, parameterized queries, and handling errors gracefully.

Steps to connect to a database in Node.js: Install the MySQL, MongoDB or PostgreSQL package. Create a database connection object. Open a database connection and handle connection errors.

.NET 4.0 is used to create a variety of applications and it provides application developers with rich features including: object-oriented programming, flexibility, powerful architecture, cloud computing integration, performance optimization, extensive libraries, security, Scalability, data access, and mobile development support.
