Starting with 18c is possible to duplicate one PDB from an active database. This is a cool feature that helps a lot in daily activities. But recently I got one error when the destination is using ASM, and the files (of course) are managed using OMF. The solution is simple and is related to a bug that is affecting the 18c, 19c, and 21c versions.
Recently I executed the upgrade of Oracle GI to 19c version, from 220.127.116.11 to 18.104.22.168 version. But one step that was not showed there was that, because of requirements, the GI was upgraded from 22.214.171.124 to 126.96.36.199. This upgrade is a just Release Update (RU) apply and opatchauto command.
But during this upgrade, from 18.2 to 18.6, I faced (more than one time – 5 to be precise) errors during the update because of the MGMTDB errors. I got these errors:
ORA-12514, TNS: Listener does not currently know of service requested in connect descriptor
CRS-10407: (:CLSCRED1079:)Credential domain does not exist.
Here I will show how to solve these errors, how to identify if everything was fine and if you can continue. Be careful that it is an example, always open a support SR to identify the source of the error.
Recently I made an Exadata stack upgrade/update to the last 19.2 version (188.8.131.52.0.191012) and I upgraded the GI from 18c to 19c (last 19c version – 184.108.40.206.191015) and after that, TFA does not work.
Since I don’t want to complete execute a TFA clean and reinstallation I tried to find the error and the solution. Here I want to share with you the workaround (since there is no solution yet) that I discovered and used to fix the error.
The actual environment is:
Old Grid Infrastructure: Version 220.127.116.11.190416
New Grid Infrastructure: Version 18.104.22.168.191015
Exadata domU: Version 22.214.171.124.0.191012 running kernel 4.1.12-124.30.1.el7uek.x86_64
After upgrade the GI from 18c to 19c, the TFA does not work. If you try to start it or collect log using it, you can receive errors. In the environment described here, the TFA was running fine with the 18c version, and the rootupgrade script from 18c to 19c does not report an error.
And to be more precise, the TFA upgrade from 18c to 19c called by rootupgrade was ok (according to the log – I will show later). But even after that, the error occurs.
The provided solution as usual (by MOS support): download the lastest TFA and reinstall the actual one. Unfortunately, I not like this approach because can lead to an error during GI upgrade for next releases (like 20) and updates (19.6 as an example).
The idea to reimage ODA is to refresh the environment without the need to jump from one by one to reach the last available version, or even rescue the system from S.O. failure/crash. The process to do a reimage can be check in the official documentation but unfortunately can be very tricky because the information (the order and steps) are not 100% clear. The idea is to show you how to reimage using version 18 (18.3 in this example), that represents the last available.