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pg_uuidv7

This is an experimental Postgres extension to generate v7 UUIDs. Created with pgrx, it is a thin wrapper around the Rust uuid crate.

Usage

postgres=# CREATE EXTENSION pg_uuidv7;
CREATE EXTENSION

postgres=# SELECT uuid_generate_v7();
           uuid_generate_v7           
--------------------------------------
 018c5732-17b3-7451-b61a-223e7ee65241
(1 row)

postgres=# SELECT uuid_v7_to_timestamptz('018c5732-17b3-7451-b61a-223e7ee65241');
   uuid_v7_to_timestamptz   
----------------------------
 2023-12-10 20:45:49.875-08
(1 row)

Docker

You can spin up a Postgres container with the pg_uuidv7 extension installed with docker compose up -d. Once the DB is up, you can connect to it using the following connection string:

postgres://postgres:password@localhost:28801/postgres

Installation

Requires pgrx. If you have pgrx installed then

cargo pgrx run pg16

should drop you into a psql prompt:

psql (16.0)
Type "help" for help.

pg_uuidv7=# CREATE EXTENSION pg_uuidv7;
CREATE EXTENSION

Benchmark

Benchmarks were run on my 2023 Apple MacBook Pro with an M2 Pro chip and 16GB of memory.

The benchmark I ran was

$ pgbench -c 8 -j 8 -t 200000 -f ${TEST}.sql

which I borrowed from fboulnois/pg_uuidv7.

From the results below this extension is faster than the native gen_random_uuid() function.

-- SELECT gen_random_uuid();
scaling factor: 1
query mode: simple
number of clients: 8
number of threads: 8
maximum number of tries: 1
number of transactions per client: 200000
number of transactions actually processed: 1600000/1600000
number of failed transactions: 0 (0.000%)
latency average = 0.103 ms
initial connection time = 11.973 ms
tps = 77810.710080 (without initial connection time)

-- SELECT uuid_generate_v7();
scaling factor: 1
query mode: simple
number of clients: 8
number of threads: 8
maximum number of tries: 1
number of transactions per client: 200000
number of transactions actually processed: 1600000/1600000
number of failed transactions: 0 (0.000%)
latency average = 0.088 ms
initial connection time = 11.978 ms
tps = 90862.885067 (without initial connection time)

See also