guid number of characters

A. Guid conceptGUID: The globally unique Identifier (globally unique identifier) is also known as the UUID (universally unique Identifier). A GUID is a 128-bit numeric identifier produced by a particular algorithm that indicates the uniqueness of

After I published the article "Performance Comparison of Self-increment fields and guid field primary keys used in the Database", I got a lot of comments from my friends in the blog Park, we have also proposed some improvement methods for my testing

In the early stage, I found some information on the Internet to solve the unique order number problem. Someone suggested using the guid type. View the description in msdn as follows: The GUID type indicates a 16-byte (128-bit) guid value. This

The previous section implements the extraction of the main GPT header, which continues to extract the entire GPT data, and merges the GPT partition table and MBR partition table into a single module, so that the master function (or the consumer)

how ORACLE produces a random number :D bms_random1, decimals (0 ~ 1)Select Dbms_random.value from dual;2. Decimal number within the specified range (0 ~ +)Select Dbms_random.value (0,100) from dual;3. Integers within the specified range (0 ~

From: http://blog.163.com/wex660@126/blog/static/241530652008111411389746/ Today, my friend has encountered this problem. It seems that I have said it many times, so I will release it to avoid talking about it every time.I. symptomGenerally, this

I have learned SQL and ADO. net over the past two days ...... I. Database Overview: 1. DBMS (databasemanagementsystem, database management system) and database. When it comes to "databases", there may be two meanings: MSSQLServer, Oracle, and other

Strictly speaking, these three production methods have certain intersections, and their positioning methods will be explained below Strictly speaking, these three production methods have certain intersections, and their positioning methods will be

Address: http://www.cnblogs.com/guogangj/archive/2013/05/30/3107965.html  Directory Overview Features Program Structure Server Introduction Client Introduction "Contract" Web API design rules Parallel write conflict and timestamp

How ORACLE produces a random number: Dbms_random--1, Decimals (0 ~ 1)Select Dbms_random.value from dual;--2, decimals within the specified range (0 ~ 100)Select Dbms_random.value (0,100) from dual;--3, integer within the specified range (0 ~