Oracle Corporation released database version 19c in 2019. 19c is considered a long term release from Oracle Corporation and its extended support date is till March 2026.
Oracle Corporation does not recommend you to upgrade to 18c if you are already on one of the Oracle 12c database releases. So, if you are on either Oracle 12c R1 or Oracle 12c R2, then the recommended upgrade is to upgrade to Oracle 19c directly.
Also, another point to note is that 19c is practically considered a patch set on top of the existing Oracle 12c database versions. Oracle 19c is essentially 12.2.0.3 (12c R2 patchset 2). DBA University's Oracle DBA Training is based on 12c R2. So, essentially we cover both 18c and 19c topics in our training
Oracle Corporation is now naming their database release numbers based on the calendar year similar to Microsoft SQL Server.
To give a background, Oracle 12c R1 was released in 2013, Oracle 12c R2 base release 12.2.0.1 in 2017, Oracle 18c which 12.2.0.2 in 2018 and Oracle 19c which is 12.2.0.3 in 2019.
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