![]() UUID stands for Universal Unique Identifier which is a 128-bit label used for information in computer systems. The keys generated have great advantages over traditional methods. | timeit | 870 ns | 1.17 us: 1.35x slower | 2.18 us: 2.51x slower | 1.60 us: 1.84x slower | 1.78 us: 2.The UUID Python module is used to generate unique ids of 128 bits which have a lot of uses in databases, addressing, primary key generation, etc. | Benchmark | uuid1 | uuid4 | uuid6 | uuid7 | uuid8 | Run the shell script bench.sh to test on your own machine. The unix_ts_ms, subsec_a, and subsec_b fields guarantee the order of UUIDs generated within the same nanosecond by monotonically incrementing the timer. rand: The remaining 54 bits are filled with cryptographically strong random dataĢ0 extra bits dedicated to sub-second precision provide nanosecond resolution.subsec_b: 8 bits allocated to sub-second precision values.subsec_a: 12 bits allocated to sub-second precision values.unix_ts_ms: 48 bit big-endian unsigned number of Unix epoch timestamp with millisecond level of precision.This implementation of uuid8() sacrifices some entropy for granularity compared to uuid7(), while being otherwise compatible. UUID version 8 provides an RFC-compatible format for experimental or vendor-specific use cases. UUID version 7 also has improved entropy characteristics over versions 1 or 6. UUID version 7 features a time-ordered value field derived from the widely implemented and well known Unix Epoch timestamp source, the number of milliseconds seconds since midnight UTC, leap seconds excluded. Systems that do not involve legacy UUIDv1 SHOULD use UUIDv7 instead. It is expected that UUIDv6 will primarily be used in contexts where there are existing v1 UUIDs. UUID version 6 is a field-compatible version of UUIDv1, reordered for improved DB locality. Generate a UUID from a random number, and the current time. ![]() ![]() If clock_seq is given, it is used as the sequence number otherwise a random 14-bit sequence number is chosen. If node is not given, a random 48-bit number is chosen. Generate a UUID from a host ID, sequence number, and the current time. Generate a UUID version 6 object from a UUID version 1 object. UUID version 8 doesn't provide as good entropy characteristics as UUID version 7, but it utilizes timestamp with nanosecond level of precision. If your use case requires greater granularity than UUID version 7 can provide, you might consider UUID version 8. As well as improved entropy characteristics over versions 1 or 6. UUID version 7 features a time-ordered value field derived from the widely implemented and well known Unix Epoch timestamp source, the number of milliseconds since midnight UTC, leap seconds excluded. Implementations SHOULD utilize UUID version 7 over UUID version 1 and 6 if possible. uuid8 () print ( my_uuid ) assert my_uuid < uuid6. uuid7 () print ( my_uuid ) assert my_uuid < uuid6. uuid6 () print ( my_uuid ) assert my_uuid < uuid6. This module extends immutable UUID objects (the UUID class) with the functions uuid6(), uuid7(), and uuid8() from the IETF draft. New time-based UUID formats which are suited for use as a database key.
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