Is it safe to talk about this now? The announcement has happened and Mike Dietrich has posted about it, so I think so…
A couple of massive things have happened regarding the multitenant architecture in Oracle 19c and 20c.
19c
Prior to 19c, you were only allowed to have a single user-defined pluggable database (plus a root container and a proxy) without having to license the full multitenant option. I’ve been a big proponent of single-tennant or lone-PDB, but I can understand the reluctance of people to go that way, as it’s harder to realise the benefits, even though they do exist.
Oracle have now announced from 19c onward you can have 3 user-defined PDBs, without having the multitenant option. This is similar to what we got with 18c XE. As Mike points out, the documentation has already been changed to reflect this.
I think this is will be a massive boost for the uptake of the multitenant architecture. I’ve got some 19c stuff that will probably make use of this within days of me getting back to work!
!!!!!Amazing!!!!!
20c
Are you one of those people that have been saying, “Screw that multitenant stuff. I’m sticking with non-CDB architecture!” Good luck with that. In 20c the non-CDB architecture will be desupported.
You probably know the non-CDB architecture was deprecated since 12.1.0.2, but in 20c non-CDB is no longer an option, unless you are happy about running without support I guess.
This means your 20c upgrade will also include a migration to the multitenant architecture. What I would suggest is you start down that road today by moving to multitenant in 19c, then when you have to move to the next long term support release (2?c), you won’t be getting any surprises. What’s more, the 3 PDBs thing in 19c makes that all the more attractive!
If this announcement has made you panic, don’t worry. I’ve written a bunch of stuff about multitenant over the years, and there’s a YouTube playlist too.
Cheers
Tim…
PS. Smiles smugly to himself that he invested the time into learning multitenant from 12.1 onward…
PPS. I will be going through my existing articles amending any mention of licensing and PDB limits and desupport etc. Those changes won’t happen overnight. 
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