![]() ![]() For details please always check the single-source-of-truth MOS Note: 742060.1. Oracle Database 18c on-premises is supposed to be generally available with the July 2018 Update. For Multitenant upgrades from Oracle 12.1.0.2 to Oracle 12.2.0.1 you may read this: Upgrade Everything at Once - Multitenant Upgrade from 12.1.0.2 to 12.2.0.1.One thing I could see in OEM was that there is a lot of difference in between Estimated and Actual Rows The DB parameters are same for both 12c and 18c DB. I have a few queries which were running fine for a long time in 12c but post upgrade to 18c they have started to take exponential more time.There are two types of files associated with each time zone file: a large file, which contains all the time zones defined in the database, and a small file, which contains only the most commonly used time zones. ![]() Oracle Database supplies multiple versions of time zone files. If the Pre-Upgrade Information Tool instructs you to upgrade the time zone files after completing the database upgrade, then use the DBMS_DST PL/SQL package to upgrade the time zone file.We can see the difference in the software version between the RAC nodes while GI upgrade is in progress …. The Grid Infrastructure upgrade can be performed in rolling fashion -configure Batches for this. ![]()
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