Exadata x4 has been announced and following is the comparison/change sheet between x3-x4
So for the flash cache compression do we need to have advanced compression licenses or not ?
Okay so the second link mentions this is a necessity. However it is odd since the flash compression is a hardware feature and hence does not depend on software, but you need an unrelated software license in order to use it.
Yes, an advanced compression license is required to use flash cache compression. The licensing guide supplied with X4s is quite explicit on that point.
I'd call the flash compression a software feature, even though it's hardware-accelerated. Older F40 flash cards, for example, can be configured to run flash cache compression with the 18.104.22.168.0 software upgrade.