6 Replies Latest reply on Jul 14, 2020 8:34 PM by Avi Miller-Oracle

    OEL 8.2 and Oracle Database 19


      I was trying to submit a support request but could no longer find the link to open up a SR. So, this community has been extremely helpful so here goes.


      I have provisioned an Oracle Linux 8.2 VM and plan to run Oracle Database 19c. I was looking for benefits of doing so as we want to migrate off AIX and IBM pSeries. One major benefit I was hoping to obtain was eliminating the need to relink the Oracle Databases executables after patching the OS. My plan was to use ksplice so these servers could just run and then bi-yearly perform reboots on the servers.


      My question I am trying to figure out are the key benefits for running Oracle Databases on Oracle Linux over AIX on pSeries and do you still need to relink the databases if using ksplice?



        • 1. Re: OEL 8.2 and Oracle Database 19
          Avi Miller-Oracle

          This white paper explains why Oracle Database runs best on Oracle Linux: https://www.oracle.com/a/ocom/docs/linux-for-oracle-database-wp-2068570.pdf  (last updated in May 2020).


          Also, you do not need to relink after updating with Ksplice, even if you patch your glibc using Ksplice for user space.

          • 2. Re: OEL 8.2 and Oracle Database 19

            That is music to my ears!



            • 3. Re: OEL 8.2 and Oracle Database 19
              Avi Miller-Oracle

              Note that the same is true for Oracle Database on Oracle Linux 7: you don't need to relink after updating via Ksplice.

              • 4. Re: OEL 8.2 and Oracle Database 19

                You cannot compare OL and AIX unless you want to compare apples and oranges. There are too many differences in system administration and design philosophy. Every modern operating system worth mentioning maintains full user space compatibility when applying patches.


                The Linux kernel is backwards compatible and hence programs are backwards compatible too. Libraries like kernel-headers and glibc are not forward compatible. Kernel-headers comes into play when you compile kernel drivers. The glibc library defines user space compatibility.


                The following seems interesting:



                If you check the available Linux patches for the previous OS releases like OL 6 and 7, which you can do browsing the software repository, such as here  for example, you will see that there are no glibc patches.


                Linux system calls are extremely stable. New kernel versions do not introduce new system calls unless required to take advantage of new CPU features or required by CPU architecture. Such modifications require a complete re-installation of the operating system.


                You need to pay attention to Linux kernel version changes if you have installed kernel drivers that are installed by the Oracle database installation. There are a few kernel drivers that are not open-source and hence Oracle cannot include them in the Linux kernel or OS distribution. For example, ASM/ACFS kernel driver. Simply relinking the Database, however, won't address the issue.


                I would not have any sleepless nights over not relinking Oracle database binaries after installing Linux OS patches. The recommendation or requirement to relink Oracle database binaries according to the documentation isn't OS specific. As far as I'm aware it is simply another safeguard that stems from the fact that the Oracle database installation isn't  maintained or known by OS software installation management.

                • 5. Re: OEL 8.2 and Oracle Database 19

                  Is there a reference note regarding not needing to relink? Also, if we don't use ksplice would we need to relink?


                  Also can we use NUMA and VMWare together?  What happens to assigned resources that are not being used?  Can they be used by other vms?  I would like to have guaranteed resources, but I don't want to "un-consolidate" or database environments if we don't need to.

                  • 6. Re: OEL 8.2 and Oracle Database 19
                    Avi Miller-Oracle

                    You'd have to ask the Database folks about any reference notes.


                    Also, I'm not sure about vNUMA and VMware. I know we support it on Oracle Linux KVM (and newer releases of Oracle VM) but I'm not sure what happens on VMware, to be honest.