What are the differences between SVN and VSS

svn And vss What are the differences

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difference ：1、vss It was developed by Microsoft , Is the charge , and svn It's open source and free ;2、vss Must have client , and svn You can use the client , You can also use command line mode , It can also be accessed as a web page ;3、vss Only support windows System , and svn Support windows and linux System ;4、vss yes “ lock - edit - Unlock ” Pattern ,svn The default is “ modify - Conflict - Merge ” Pattern ;5、vss The version number of corresponds to a single file ,svn The version number of corresponds to the entire version library .

The operating environment of this tutorial ：windows7 System 、Subversion 1.14 edition 、Dell G3 The computer .

SVN yes Subversion For short , Is an open source version control system , Compare with RCS、CVS, It uses a branch management system , It was designed to replace CVS. Many version control services on the Internet have been from CVS Migrate to Subversion.

VSS The full name is Visual Source Safe . As Microsoft Visual Studio A member of , Its main task is to manage project documents , It can be applied to almost any software project . Manage source code and documentation for different versions of software development , Small footprint and easy access to various versions of code and documents , Effective coordination of access to source code in the development team .

svn And vss The difference between

1、vss Microsoft charges for it ,svn It's open source and free

2、vss Must have client ,svn You can use the client , You can also use command line mode , It can also be accessed as a web page

3、vss Only support windows,svn Support windows and linux

4、vss It's locking － edit － Unlock mode ,svn Although locking is also supported , But the default is to modify － Conflict － Merge mode

5、vss The version number of corresponds to a single file ,svn The version number of corresponds to the entire version library

Expanding knowledge ：

svn Characteristics of

• Unified version number .CVS It is to arrange the version number for each file in sequence , The version number of each file is different at a certain time . and Subversion Next , Any submission will add all files to the same new version number , Even files that are not involved in the submission . therefore , The version number of each file is the same at any time . Files with the same version number constitute a version of the software .

• Atomic submission . Submit one or more files at a time , All submitted as a whole . Accidents such as transmission interruption happened in this process , It will not cause database incompleteness and data corruption .

• Rename 、 Copy 、 Actions such as deleting files are stored in the version history .

• For binary files , Space saving storage methods are used （ Simple understanding , It only stores the differences from the previous version ）.

• The catalog also has a version history . The whole tree can be moved or copied , Easy to operate , And can keep all version records .

• The overhead of branching is very small .

• Optimized database access , So that some operations can be done without accessing the database . This reduces a lot of unnecessary network traffic between the database host .

• Support metadata （Metadata） management . Each directory or file can define attributes （Property）, It's some hidden key value pairs , Users can customize the attribute content , And the attribute is within the scope of version control just like the file content .

• Support FSFS and Berkeley DB Two database formats .

SVN advantage

• Storage

  SVN The server Have both CVS The advantages of data storage , For example, a resource tree structure will be formed after information resources are stored , Easy to store at the same time , Data is generally not lost , At the same time, it has its own characteristics .SVN Through relational database and binary storage , At the same time, it solves the problems that the same file cannot be read and written at the same time in the past , At the same time, it adds its own unique “ Zero or one ” principle .

• Speed

  With people's initial CVS comparison ,SVN Great improvement in speed . because SVN The server only supports a small amount of information 、 Resource transfer , Compared with other systems , The offline mode is more supported , Therefore, the phenomenon of network congestion is avoided .

• Security

  SVN It is a technically safer product , The combination of system and control is realized . On the one hand, the overall security functions of the system can be effectively distributed in the branch system , So as to ensure the normal operation of the branch system , So that each branch system can complement each other , Finally, the security of the system integrity can be guaranteed , Achieve the ultimate goal of pursuing safety through the principle of balance .

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