uuid generator

This is a creation in Article, where the information may have evolved or changed. Objective In game development, we often have to set a globally unique ID for a request, an object, or something else. The common choices are random numbers, timestamps, UUID, and Redis generation IDs, which can either be duplicated or too slow, so I developed wuid, a very fast unique ID generator. The wuid is 100 times times f

1. view the uuid of liunx Ll/dev/Disk/by-UUID D4ec5ce9-f863-452b-ac7f-d9dd0cf32a86-> ../sda3E5bcb376-ec13-46c8-801f-2a51b38372c1-> ../sda1F87c200b-faf1-4d27-a88b-456dd803b047-> ../sda2 ========================================================== = 2. view the uuid of SVN on liunx CD/opt/SVN/apsrc/project1/ Ll In the directory Conf DB Format Hooks Locks

()); returnuuid.tostring (); } Public StaticString Base58uuid () {uuid UUID=Uuid.randomuuid (); returnbase58uuid (UUID); } protected StaticString base58uuid (uuid uuid) {bytebuffer bb= Bytebuffer.wrap (New byte[16]); Bb.putlong (Uuid.getmostsignificantbits (

1 // discover Asset Primary key 2 @Id3 @GeneratedValue (generator= "System-uuid")4 @ Genericgenerator (name= "System-uuid", strategy= "UUID")5 private Long ID; 　　The GUID is a 128-bit long number, typically represented by a 16 binary. The core idea of the algorithm is to combine the machine's NIC, local

In the project, you need to change the original id to uuid, so you can directly use the uuid library in boost to generate a uuid. However, during the test, it was found that the program performance was severely degraded. In the past, 0.6 million pieces of data could be processed per minute, and only about 20 thousand pieces of data could be processed after

The globally unique identifier (guid,globally unique Identifier) is also known as the UUID (universally unique Identifier).A GUID is a numeric identifier generated by the algorithm with a binary length of 128 bits. The format of the GUID is "Xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx", where X is a 32-bit hexadecimal number in the range of 0-9 or a-f. Ideally, no computer or computer cluster will generate two identical GUIDs.The total number of GUIDs reache

I. How to obtain UUID in Linux disk partition 1. # fdisk-lDisk/dev/sda: 1000.2 GB, 1000204886016bytes240heads, 63 sectors/track, 129201 cylindersUnits = cylindersof15120 * 512 = 7741440 bytesSectorsize (logical/physic I. How to obtain the UUID of a Linux disk partition 1. # fdisk-lDisk/dev/sda: 1000.2 GB, 1000204886016 bytes240 heads, 63 sectors/track, 129201 cylindersUnits = cylinders of 15120*512 = 774144

Note: UUID-universally unique identifiers is a globally unique identifier. I. How to obtain the uuid of a Linux disk partition 1. [San @ localhost ~] $ LS-L/dev/Disk/by-UUID/ Total 0Lrwxrwxrwx 1 Root 10 2010-01-18 0733f5c1-cb85-4f98-9d4f-122cfcee9806-> http://www.cnblogs.com/sdc1 Lrwxrwxrwx 1 Root 10 2010-01-18 03754-1bdb-> http://www.cnblogs.com/sda5Lrwxrwxrwx 1

15 online Web2.0 image generators I. Button Generator 1. buttonator An online builder that specializes in creating web style buttons. It provides a variety of templates to customize text color, font style, and text length and width. some templates need to be registered before they can be used (but why do I encounter errors when I open the registration page? LP again ?) 2.Roundedcornr Generator for creati

Three ways to view the UUID of a device are summarized below:1 Command view: Blkid2 file Views: Ls-l/dev/disk/by-uuid3 Command view: VOL_ID/DEV/SDA1The role and significance of UUID1: It's really the only signThe UUID provides a unique identification string for the storage device in the system, regardless of the type of device. If you start up in the system and use a drive letter mount, you may not find the

How to generate UUID in PHP, the method of survival uuid. The code is as follows: function guid () {if (function_exists (' Com_create_guid ')) {return com_create_guid ();} Else{mt_srand (Double) microtime () *10000)//optional for PHP 4.2.0 and up. $charid = Strtoupper (MD5 (Uniqid (rand (), true) ); $hyphen = CHR;//"-" $uuid = Chr (123)//"{". substr ($charid,

My error message......Global1.cpp: 39: 23: UUID/UUID. h: no such file or directoryGlobal1.cpp: In static member function 'static quuid Global: generateuuid ()':Global1.cpp: 188: ': uuid_generate' undeclared (first use here)Make [1]: *** [. OBJ/Linux-generic-G ++ // global1.o] Error 1Make [1]: Leaving directory '/usr/src/qtopia-free-1.7.0/src/libraries/qtopia1'Make: *** [libraries/qtopia1] Error 2You have ne

is aboutThe following is the probability of collision after n UUID is calculated based on x = 2122:N Probability68,719,476,736 = 236 0.0000000000000004 (4x10-16)2,199,023,255,552 = 241 0.0000000000004 (4x10-13)70,368,744,177,664 = 246 0.0000000004 (4x10-10)Compared with the probability of a person being hit by a meteorite, it is known that the probability of a person being hit by a meteorite is estimated to be 1 [1] In 17 billion, that is, the probab

it must, of course, since the OS supports UUID identification ), they're named slightly differently and-the biggest plus-Linux (RedHat and Ubuntu, at least) come with plenty of programs to work with disk UUID's and plenty of hooks to allow other programs to make use of the disk UUID's as well! the most basic program (that Solaris has picked up on) is called "uuidgen. "This program will generate a uuid fo

Java Web code generator, which focuses on Java Web project general purpose code generator and Java Web Code Generator This project is a general code generator for the javaWEB project. jsp, js, And java files are generated based on database tables and custom code templates. It is a powerful tool for developing javaweb p

increment nor the UUID.This time, you need to customize a set of ID generator machine mechanism NoteI've encountered a duplicate GUID, so it's a potential problem to do a unique primary key directly with a GUID! (GUID is an implementation of the UUID standard) This feeling still depends on the specific scene, if it is just a database server, and the business logic is not complex, can be used in the way

primary key is designed for the table, this primary key is selected by default for the clustered index) If the data writing sequence of the InnoDB table can be consistent with the leaf node sequence of the B + tree index, the access efficiency is the highest at this time. Of course, if your system does not pursue performance limits Why don't I customize my primary key policy? Mysql uses auto-increment, otherwise innodb also needs to maintain its own primary key index. If it is a single

by the Java.util.UUID Class), 122 bits are randomly generated, 4 bits are used in this version (the ' randomly generated UUID '), and 2 are in their variant (' Leach-salz ') is used. Using the birthday paradox, the probability of the two UUID having the same value is approximately The following is the probability of collisions after the N-pen uuid is