Then what would be way if we want some tables to be skipped for autovacuum.
What do you think, what should we do?
This will enable for older version to stay.
VACUUM FREEZE means that you will put a lock on the table and release it after the job is completed. It is the most effective option but requires a kind of down time for all queries on the table.
If you refer to "older version to stay", you may intend to access deleted data (i.e. when you run an UPDATE, you actually run an INSERT and a DELETE). Deleted data is not accessible. If you need to have access to historical data, I'd suggest creating a history table keeping track of all INSERT, UPDATE and DELETE.
If you plan to reduce the impact of the VACUUM in terms of performance and lock-time, I would recommend, on the contrary, to run it often, so that it has a minimal amount of work to do. Disabling vacuum will increase your probability of filling your tables with unnecessary bloat. We evaluated the option of running a vacuum daily on a table with millions of rows and quickly came to the conclusion that it was a really bad idea.
