![]() ![]() On the first server: auto_increment_increment= 8 auto_increment_offset= 1 ![]() For example, if you think you will have 8 servers then you have to set the next values:ġ. The first one should hold the maximum potential number of servers, and the second one the number on the server. On one project in which we already had auto-incremented IDs, we configured auto_increment_increment and auto_increment_offset settings of MySQL. Most relational databases have mechanisms to generate unique sequences of auto-incremented IDs on different servers to then be able to move data between database servers. But what if it already has company 135? OK, you could somehow regenerate the ID and take care of delivering this change to a user, – however, you will pay a big price for data loss and spend a lot of time recovering data for a user who went offline or edited between a swap. You are moving company 135 to another server. You decide to rapidly move this client from this server to another free server (which has fewer clients). Let’s say during a peak you experience a server overload – for example, one client has grown and takes 90% of payload. Imagine you created your awesome well-tuned orchestration to spawn new servers with new DB instances and routing mechanisms – you are ready for high-load by scaling horizontally! When you are scaling you might need to be able to move data between different database servers, but you will be blocked by the same IDs on different servers ![]() This is just an example of the worst-case – it is always better to deliver data to server ASAP, at least to make data visible for other users if you have a multi-user app). You don't need to call a server to approve these IDs – no one will reuse it because it is unique! You could submit all these data even after an hour of offline work and you would still be sure that no one else generated it. ![]() Later in the post, I will explain why it is better to use this version if you have no security restrictions about data inside of id (when it was generated and by whom).Īny client can generate an ID of a company on their own side (Frontend or Application), and then create branches by linking with this companyId. It includes 2 parts: 48-bit Host Mac Address (already unique for different clients who generate it), 60-bit Timestamp (nanoseconds precision even two subsequent generate function calls will never generate the same timestamps). A typical example encoded in HEX is the following: 98b718bf-c 96e- 42c 2- 8268-f 4b 8cbe 1f 274Īny modern language has a built-in module and function to generate new UUID or has a third-party library.Īnother very common one is UUIDv1. It is possible because of using a large (128-bit) random number. It stands for a universally unique identifier, which is absolutely unique once you generate it ANYWHERE. Simplicity – not complexity – moves this world forward. For QA it is harder to find issues, support, add new features, and on-board new team, so don't be surprised if your developers are super-slow and "eat" all your budget! Remember that every complex code is longer to write. Obviously, such an architectural solution is crooked and requires a lot of developer and QA resources. Before posting to the server (or offline) on frontend, you will have to create some pseudo-identifiers and then replace them with real on server (only server knows correct last available ID) ![]()
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