I think one of the main problems was, that the marketing was especially terrible as they branded both consumer SSDs with an Optane cache as Optane as well as the "real" Optane DC persistent memory, which is put into the appropriate DIMM slots.
Another issue may be that Optane DC persistent memory simply was not fast enough to replace non persistent RAM.
Still, I hope that another technology will arise, which is byte-addressable and persistent/durable. I think it could radically change the design of database systems again. You wouldn't have to have a page cache / buffer manager, which retrieves same sized blocks (or multiples of blocks) for instance. You probably wouldn't even need serialization/deserialization to disk.
It would be great if it'd be possible to for instance read 512byte blocks from disk with current SSDs, but I guess the block overhead for meta data might be too big.
Another issue may be that Optane DC persistent memory simply was not fast enough to replace non persistent RAM.
Still, I hope that another technology will arise, which is byte-addressable and persistent/durable. I think it could radically change the design of database systems again. You wouldn't have to have a page cache / buffer manager, which retrieves same sized blocks (or multiples of blocks) for instance. You probably wouldn't even need serialization/deserialization to disk.
It would be great if it'd be possible to for instance read 512byte blocks from disk with current SSDs, but I guess the block overhead for meta data might be too big.