![]() ![]() ![]() When stored as a string, UUIDs require no. This feature of MySQL UUID allows us to merge. Perhaps the easiest way to store a UUID to a database is to create a char(36) column and store the UUID as a string. Server version: 5.5.44-0ubuntu0.14.04. MySQL UUID not only creates unique values across the table but also across different databases and servers. Besides the quadruple disk space used, which may be largely negligible after additional data is added, they appear to me to be the same. What I am essentially trying to discover is difference in efficiency between the two approaches. If you have told the database that all values in that column should be unique then yes, it will raise an error in these cases. The use case for this type of set up would be the traditional primary key for inter-table relationships, with unique identifier used for inter-system relationships. Whereas many people stress over the advantages of either, what are the disadvantages cancelled out by using both data types? If you have a good use case for getting that ordering (and thanks for the two workarounds), then maybe the documentation should point them out. Whyever would you want what you are asking for My question is serious. ![]() I was initially sceptical towards using UUIDs as primary keys, and indeed I still am, however I see potential here to create a flexible database that can use both. blackparrot 3 3 UUIDs (and other hash-like ids) are not intended for display. The test and results are shown below, but if you just want the summary, it indicates that INT AUTOINCREMENT and BINARY(16) RANDOM have identical performance on data ranges up to 200,000 (the database was pre-populated prior to tests). It was when I reached the final one BINARY(16) that I started to compare performance with basic auto-increment integer. Migration squashing is only available for the MySQL, PostgreSQL, and SQLite databases and utilizes the databases command-line client. The formats I used changed as I became less naive from: I've been using UUIDs in my systems for a while now for a variety of reasons ranging from logging to delayed correlation. ![]()
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