Multitenant has been introduced in 220.127.116.11 with the goal to share resources but isolate data. However, having all PDBs in the same root may be convenient to manipulate data in multiple PDBs. In the first patchset, 18.104.22.168, a way to query cross-container has been introduced for the CDB administrator to see data in other containers. In the second release, 22.214.171.124, this goes further with the introduction of Application Containers and cross-PDB DML. Currently, not all…
multitenant Archives - Blog dbi services
In the Oracle Public Cloud, fast provisioning gets all its meaning when creating a RAC database service: in one hour you can get an operational highly available multitenant database. You can even create it in Data Guard for Disaster Recovery. Now, Oracle is pushing ACFS to store the datafiles rather than direct ASM. Especially in multitenant because a great feature is thin cloning: CREATE PLUGGABLE DATABASE AS SNAPSHOT COPY. However, I encountered an error when…
Today at UKOUG TECH16 conference I’m presenting the internals of the new multitenant architecture: 12c Multitenant: Not a Revolution, Just an Evolution. My goal is to show how it works, that metadata links and object links are not blind magic. Here are the links to the blog posts I’ve published about multitenant internals.
Easier than unplug/plug, you can move pluggable databases with remote cloning. It’s the same idea but you don’t have to manage the files yourself: the are shipped through database link. However, this uses the ‘remote file protocol’ and it fails with version mismatch: ORA-17628: Oracle error 17630 returned by remote Oracle server ORA-17630: Mismatch in the remote file protocol version client server
In the previous post I described how simple it is to unplug a PDB and plug it into a newer version CDB. One goal of dictionary separation in the multitenant architecture is to keep system objects on CDB$ROOT only. Knowing that an upgrade does not touch the application metadata and data, does this make PDB upgrade fast as a simple refresh of metadata links?
12.2 is available in the Oracle Public Cloud DBaaS. If you have a 12.1 DBaaS service, there’s no button to upgrade it. I’ll describe all the possible upgrade procedures and the first one, and the most simple, is to create a new DBaaS service in 12.2 and unplug/plug the PDBs to it.