A tiny Postgres extension to create valid version 7 UUIDs in Postgres.
These are regular Postgres UUIDs, so they can be used as primary keys, converted to and from strings, included in indexes, etc:
SELECT uuid_generate_v7();
uuid_generate_v7
--------------------------------------
018570bb-4a7d-7c7e-8df4-6d47afd8c8fc
(1 row)
The timestamp component of these UUIDs can be extracted:
SELECT uuid_v7_to_timestamptz('018570bb-4a7d-7c7e-8df4-6d47afd8c8fc');
uuid_v7_to_timestamptz
----------------------------
2023-01-02 04:26:40.637+00
(1 row)
Timestamps can be converted to v7 UUIDs:
SELECT uuid_timestamptz_to_v7('2023-01-02 04:26:40.637+00');
uuid_timestamptz_to_v7
--------------------------------------
018570bb-4a7d-7630-a5c4-89b795024c5d
(1 row)
-- for date range queries set the second argument to true to zero the random bits
SELECT uuid_timestamptz_to_v7('2023-01-02 04:26:40.637+00', true);
uuid_timestamptz_to_v7
--------------------------------------
018570bb-4a7d-7000-8000-000000000000
(1 row)
uuid_generate_v7()
is as fast as the native gen_random_uuid()
function. See
the benchmarks for more details.
Version 7 UUIDs have a few advantages. They include a 48-bit Unix timestamp with millisecond accuracy and will overflow far in the future (10899 AD). They also include 74 random bits which means billions can be created every second without collisions. Because of their structure they are globally sortable and can be created in parallel in a distributed system.
Important
These instructions are for x86_64 Linux. On other architectures (e.g. Apple M1, Raspberry Pi, etc.) follow the build instructions instead.
- Download the latest
.tar.gz
release and extract it to a temporary directory - Copy
pg_uuidv7.so
for your Postgres version into the Postgres module directory - Copy
pg_uuidv7--1.6.sql
andpg_uuidv7.control
into the Postgres extension directory - Enable the extension in the database using
CREATE EXTENSION pg_uuidv7;
# example shell script to install pg_uuidv7
cd "$(mktemp -d)"
curl -LO "https://github.com/fboulnois/pg_uuidv7/releases/download/v1.6.0/{pg_uuidv7.tar.gz,SHA256SUMS}"
tar xf pg_uuidv7.tar.gz
sha256sum -c SHA256SUMS
PG_MAJOR=$(pg_config --version | sed 's/^.* \([0-9]\{1,\}\).*$/\1/')
cp "$PG_MAJOR/pg_uuidv7.so" "$(pg_config --pkglibdir)"
cp pg_uuidv7--1.6.sql pg_uuidv7.control "$(pg_config --sharedir)/extension"
psql -c "CREATE EXTENSION pg_uuidv7;"
pg_uuidv7
only requires the libpq
headers and Postgres extension tools to
build the code. On Debian, these headers are included in the libpq-dev
and
postgresql-server-dev-all
packages.
To build the code run make
. To install the extension locally run make install
.
A Dockerfile
is available to build the code using the official
Postgres Docker image:
docker build . --tag pg_uuidv7
A prebuilt x86_64 version of this image is on GitHub:
docker pull ghcr.io/fboulnois/pg_uuidv7:1.6.0
The prebuilt image is similar
to a vanilla Postgres instance so the extension needs to be enabled manually or
with an initialization script with CREATE EXTENSION pg_uuidv7;
.
A separate Dockerfile
is available to build the extension
against a specific version of Postgres and run the regression tests:
docker build . --file test/Dockerfile --tag pgxn-test
docker run --rm -it pgxn-test /bin/sh
# once in container
pg-start 17
pg-build-test
See the CONTRIBUTING.md file for more details. In short, follow the style guidelines, agree to the Developer Certificate of Origin, and submit a PR.