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Changes between Version 2 and Version 3 of Ticket #32653, comment 5

v2	v3
1	1	@Mariusz the issue is see with your solution is that it will work from my current case Postgres as `default`, Oracle as `old`. Where Postgres wont change the `db_table` as long as its under 63 chars??? But if we have the inverse, Oracle as `default` and Postgres as `new`; it will break Postgres since the `db_table` would be something like `backends_verylongmodelname1234` and Postgres would want the whole string `backends_verylongmodelnamezzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz`. This is because the `default` connection is used to setup the table names at startup https://github.com/django/django/blob/stable/3.2.x/django/db/models/options.py#L207 . The solution @Simon suggested would work on both cases.
	2
	3	Ideally, the line `self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())` would be removed, and the aliases that is done in the `SQLCompiler` be moved to the indivial backend, and that way you can cache the table names for later use.