splitting WAL (was RE: Providing anonymous mmap as an option of sharing memory)

In case of WAL per database, the operations done on a shared catalog from a
backend would need flushing system WAL and database WAL to ensure such
transaction commit. Otherwise only flushing database WAL would do.

I don't think that is a good idea. If you want databases separated you should
install more than one instance. That gives you way more flexibility.

Imho per database WAL is a deficiency, not a feature.

Andreas

PS: problem with mmap was, that it has no attached process count