sequential-uuids VS pg_tle

Disclaimer: not a dba so my terms might not be appropriate

I’ve seen uuid4 which replaces the first 4 bytes with a timestamp. It was mentioned to me that this strategy allows postgres to write at the end of the index instead of arbitrarily on disk. I also presume it means it has some decent sorting.

[inspiration](https://github.com/tvondra/sequential-uuids/blob/master/sequ...)

yum install -y git git clone https://github.com/tvondra/sequential-uuids.git ysqlsh -h $(hostname) --echo-all --quiet \ --file sequential-uuids/test/sql/uuids.sql | sdiff sequential-uuids/test/expected/uuids.out -

If you want to keep locality when using uuids, use a different generation function such as: https://github.com/tvondra/sequential-uuids

OP, have a pretty large B2B SAAS app with all UUID pkeys, and the largest issues i'd say with UUID compared to bigint are: size, index bloat, WAL bloat, much slower GIST indexes (for exclusion constraints). You can work around some of the issues (WAL bloat, index bloat) by using a better behaved UUID generation function: https://github.com/tvondra/sequential-uuids You can get something similar for your app side of things if you need to generate UUIDs there.

Use this: https://github.com/tvondra/sequential-uuids

If you cannot install extensions, I just wrote a PL/PGSQL implementation for the time-based generator I could share.

Just fyi, UUID in Postgres is not 40 text chars, it's 16 bytes binary and has a canonical text representation. Also, you don't need to use UUIDv4, I am quite partial to: https://github.com/tvondra/sequential-uuids

Have you tried this in databases with [TLE](https://github.com/aws/pg_tle)s?

I dunno about other hosted Postgres providers, but not on AWS RDS no, as the Python extension is untrusted. Looks like you can use plv8 via pg_tle (Trusted Language Extensions) [1] though.

[1] https://github.com/aws/pg_tle

Partially correct, this doesn't work with RDS as you can't install pgsql-http (a requirement for automatic install). However all the extensions listed are "Trusted Language Extensions for PostgreSQL" which was developed by AWS to enable installing extensions written in "Safe" languages. So I believe the all the extensions listed could bee installed manually.

https://github.com/aws/pg_tle

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Postg...

>pg_idkit to their list of supported extensions

For some of these simpler extensions, we're looking at using AWS's TLE (https://github.com/aws/pg_tle), which would allow user-contributed extensions. If we can pull that off, we'll probably look again at the current set of extensions we offer and then see which ones can be ported to a TLE instead

This is a new thing from AWS: https://github.com/aws/pg_tle. It lets you build extensions that people can use on RDS.

I'm taking those functions from the examples in pg_tle, an extension that helps packaging those functions. The functions calculate the Manhattan and Euclidian distance: