lookipipe.blogg.se - Mysql uuid functions

#MYSQL UUID FUNCTIONS UPDATE#
#MYSQL UUID FUNCTIONS CODE#

UUID_SHORT() Code language: SQL (Structured Query Language) ( sql ) The syntax of UUID_SHORT() is identical to the UUID() function. On the other hand, the server_id in the version 1 UUID (generated by UUID() function) is 6 bytes long so, no need to worry about server_id duplication even for large corporations. So, if you have more than 256 servers, chances are few of them share the same node id, which will eventually fail in the space uniqueness. The server_id in the UUID_SHORT() is only a 1 byte/8bit. If you are in a situation where you need to generate more than 16 million unique IDs per second, we would recommend you to go with 128-bit UUID.Īgain, the UUID_SHORT() does not provide uniqueness in space if you have more than 256 servers. The second issue is unexpected in most cases, but the first one should be taken into consideration.

#MYSQL UUID FUNCTIONS UPDATE#

Update the system clock and reboot the server.Boot the servers with the same server_id at the same time and share data across them.Produce more than 16 million IDs on same server per second.Note that the UUID_SHORT() generates a unique identifier as long as you don’t. incremented variable – It’s a 24 bit sequentially increasing integer number.server startup time in seconds – The time in seconds when your server starts/boots.

server_id – server id of your server, it’s unique by default for all your server replicas and source.

The short UUID is composed of the three components. Like UUID() function, the UUID_SHORT() also generates a unique identifier, but it’s an auto-incrementing identifier, unlike the 128-bit UUID. The UUID_SHORT() generates a pure integer string without hex characters and dashes. The produced short UUID is a 64-bit unsigned integer and does not contain any hexadecimal characters like a string format 128-bit identifier produced by UUID() function. What is UUID_SHORT() Function?Īs the name suggests, UUID_SHORT() is a MySQL function to generate a unique short version of a UUID. We will also be learning how the short UUID is created, the logic behind it, and the alternative methods to the UUID_SHORT(). In this article, we will study the MySQL UUID_SHORT() function with its syntax, examples, and advantages over the UUID() function.