ora2pg VS Hashids.java

It seems that Oracle customers started using the Auto Index feature. I can see that when they migrate to YugabyteDB. YugabyteDB Voyager is a tool to ease the migration of schema and data. As YugabyteDB is PostgreSQL compatible, ora2pg is used when the source is Oracle. It extracts the schema and data. Some customers moving from Oracle ATP managed service (Autonomous Transaction Processing) reported that a few indexes were not extracted: the ones that have been created automatically by the Automatic Indexing feature of Oracle 19c.

Have you heard of "ora2pg"? It works for both MySQL and Oracle:

https://github.com/darold/ora2pg

https://ora2pg.darold.net/

You basically want Hashids but sequential? Why not simple convert a base 10 (0-9) number to hex? (0-F)

I found hashids [1] to be a great compromise between integer ids in the database and copyable non-enumerable strings on the client.

[1] https://hashids.org/

I wonder how this might compare to just storing regular autoincrementing ints in the database, and converting to/from hashids (https://hashids.org/) at the edge. It eliminates the collision concern and stores more compactly at the cost of a tiny amount of encode/decode when processing requests. You’d want to push it down as close to the database layer as possible to avoid inadvertent int ID leaks; I added native hashids support to clickhouse but I’m not sure what other database support might entail.

Since hashids are not really hashes and are not secure at all this is not even achieved. Hashids can be easily decoded without the salt by a simple brute-force attack described by the authors of hashid themselves right on their website: https://hashids.org/

You don't necessarily need to use UUIDs. You could use something like Hashids to generate random strings from your sequential IDs in a reversible way, so that users can't predict what their values will be, but you can decode them as needed.

You should not use UUIDv4 as a primary key. You can use normal int values and then use hashids to make them safe for URL. UUIDv7 might be good to use as well once they are more widely supported as well.