UUID v1 Generator
A time-based UUID generated using timestamp and MAC address, containing time-series order information. Suitable for logging, event tracking, and applications requiring time-series order.
UUID V7 Generator
Back to UUID Tools ListHere are the generated UUID V7 results
Batch Generate
Enter the quantity and click "Generate" to batch create UUID V7
FAQ
What is UUID v7
UUID v7 is a time-based unique identifier. The first 48 bits encode a millisecond-level Unix timestamp, while the remaining bits are filled with random numbers. This provides both global uniqueness and chronological orderability, making it especially suitable for databases and distributed systems that require sequencing.
What are the advantages of UUID v7?
UUID v7 combines time-ordering with high-precision timestamps, allowing it to deliver better insertion and query performance in databases compared to randomly generated UUID v4. In addition, it preserves the global uniqueness of traditional UUIDs, addresses the MAC address privacy concerns of UUID v1, and ensures a low collision probability through its random component.
What are the disadvantages of UUID v7?
The main disadvantage of UUID v7 lies in the sequential nature of its timestamp. While this is a feature, it may expose the generation order, potentially impacting privacy. Additionally, if the system clock is rolled back, it can affect the uniqueness of UUIDs, requiring extra measures to ensure accuracy.
When would you actually need to use UUID v7?
UUID v7 is ideal when you need partially ordered, time-sortable identifiers, especially in database index fields, to improve performance and avoid the indexing bottlenecks caused by purely random UUID v4. The first 48 bits of UUID v7 use a Unix Epoch timestamp, ensuring partial time ordering and enhancing database indexing efficiency. If your application doesn’t require ordering and only needs sufficiently long, hard-to-predict random identifiers, UUID v4 is sufficient and simpler to use.
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A UUID is a universally unique identifier generated from completely random numbers, with an extremely low chance of duplication, ensuring near-global uniqueness.