带您理解SQLSERVER是如何执行一个查询的
带您理解SQLSERVER是如何执行一个查询的 看这篇文章之前，阁下可以先看一下下面的文章 SQLSERVER独特的任务调度算法"SQLOS" SQL Server SQLOS 的任务调度[转] 翻译自： 不知道是哪篇文章抄哪篇文章的 ，不管他了，我也偷他们的文章，嘎嘎嘎嘎嘎。。。 我将会
带您理解SQLSERVER是如何执行一个查询的
看这篇文章之前，阁下可以先看一下下面的文章
SQLSERVER独特的任务调度算法"SQLOS"
SQL Server SQLOS 的任务调度[转]
翻译自：
不知道是哪篇文章抄哪篇文章的 ，不管他了，我也偷他们的文章，嘎嘎嘎嘎嘎。。。
我将会用尽本人的所有功力并且结合研究SQLSERVER以来的知识去翻译这篇文章
希望大家多多支持o(∩_∩)o，其实我也是站在巨人的肩膀上的，呵呵~
特别说明：为了节省篇幅，文中会对原文有删减，删减的部分都是一些不重要的部分
在这里感谢有道词典（我不是卖广告啊！！！）
正式开始
连接方式和请求
如果你是一个开发者，并且你的程序使用SQLSERVER来做数据库的话
你会想知道当你用你的程序执行一个查询的时候实际发生了什么事情
我希望这篇文章能够帮你写出更好的数据库应用程序和帮你更深入了解遇到的数据库性能问题
SQLSERVER是一个C/S模型的平台。唯一和数据库交互的方式只有发送包含数据库命令的请求到数据库服务器端。
客户端和数据库通信的协议使用一种叫做TDS的协议(Tabular Data Sream)
园子里的文章：
表格数据流协议TDS
TDS协议解析（转载）
如果你用微软的Network Monitor工具来抓取SQL Server和客户端之间的网络包
你会看到使用的是TDS协议
在Description那一列
TDS:Response,Version=7.1......
TDS:SQLBatch,Version=7.1.......
那四个SSL连接是客户端登录SQLSERVER前做的加密连接（这里不管你有没有用SSL加密数据传输，SQLSERVER都会在登录前加密
用户发过来的用户名和密码，而登录了之后才使用您配置的SSL证书来加密客户端和SQLSERVER往来的数据）
SQLSERVER都会加密客户端发过来的用户名和密码（使用SQL验证不是使用Windows验证）
大家可以留意一下SQL ERRORLOG里在SQLSERVER启动的时候的日志
会看到一句：A self-generated certificate was sccessfully loaded for encryption
默认情况下SQL Server会自动生成一个证书并使用这个证书来对客户端登录SQLSERVER的时候的连接做SSL加密，
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
1386
52
How to import mdf file into sqlserver
Apr 08, 2024 am 11:41 AM
The import steps are as follows: Copy the MDF file to SQL Server's data directory (usually C:\Program Files\Microsoft SQL Server\MSSQL\DATA). In SQL Server Management Studio (SSMS), open the database and select Attach. Click the Add button and select the MDF file. Confirm the database name and click the OK button.
How to solve the problem that the object named already exists in the sqlserver database
Apr 05, 2024 pm 09:42 PM
For objects with the same name that already exist in the SQL Server database, the following steps need to be taken: Confirm the object type (table, view, stored procedure). IF NOT EXISTS can be used to skip creation if the object is empty. If the object has data, use a different name or modify the structure. Use DROP to delete existing objects (use caution, backup recommended). Check for schema changes to make sure there are no references to deleted or renamed objects.
What to do if the sqlserver service cannot be started
Apr 05, 2024 pm 10:00 PM
When the SQL Server service fails to start, here are some steps to resolve: Check the error log to determine the root cause. Make sure the service account has permission to start the service. Check whether dependency services are running. Disable antivirus software. Repair SQL Server installation. If the repair does not work, reinstall SQL Server.
How to check sqlserver port number
Apr 05, 2024 pm 09:57 PM
To view the SQL Server port number: Open SSMS and connect to the server. Find the server name in Object Explorer, right-click it and select Properties. In the Connection tab, view the TCP Port field.
How to recover accidentally deleted database in sqlserver
Apr 05, 2024 pm 10:39 PM
If you accidentally delete a SQL Server database, you can take the following steps to recover: stop database activity; back up log files; check database logs; recovery options: restore from backup; restore from transaction log; use DBCC CHECKDB; use third-party tools. Please back up your database regularly and enable transaction logging to prevent data loss.
Where is the sqlserver database?
Apr 05, 2024 pm 08:21 PM
SQL Server database files are usually stored in the following default location: Windows: C:\Program Files\Microsoft SQL Server\MSSQL\DATALinux: /var/opt/mssql/data The database file location can be customized by modifying the database file path setting.
How to delete sqlserver if the installation fails?
Apr 05, 2024 pm 11:27 PM
If the SQL Server installation fails, you can clean it up by following these steps: Uninstall SQL Server Delete registry keys Delete files and folders Restart the computer
12306 How to check historical ticket purchase records How to check historical ticket purchase records
Mar 28, 2024 pm 03:11 PM
Download the latest version of 12306 ticket booking app. It is a travel ticket purchasing software that everyone is very satisfied with. It is very convenient to go wherever you want. There are many ticket sources provided in the software. You only need to pass real-name authentication to purchase tickets online. All users You can easily buy travel tickets and air tickets and enjoy different discounts. You can also start booking reservations in advance to grab tickets. You can book hotels or special car transfers. With it, you can go where you want to go and buy tickets with one click. Traveling is simpler and more convenient, making everyone's travel experience more comfortable. Now the editor details it online Provides 12306 users with a way to view historical ticket purchase records. 1. Open Railway 12306, click My in the lower right corner, and click My Order 2. Click Paid on the order page. 3. On the paid page
