Oracle Linux instance of Red Hat Enterprise Linux derivative
RHEL compatibility
Oracle Corporation distributes Oracle Linux with two alternative Linux kernels:Red Hat Compatible Kernel (RHCK) –  identical to the kernel shipped in RHEL
Unbreakable Enterprise Kernel (UEK) –  based on newer mainline Linux kernel versions, with Oracle's own enhancements for OLTP, InfiniBand, SSD disk access, NUMA-optimizations, Reliable Datagram Sockets (RDS), async I/O, OCFS2, and networking.Oracle promotes Unbreakable Enterprise Kernel as having 100% compatibility with RHEL.
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