By Franck Pachot . 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…
By Franck Pachot . 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. Here is my DBaaS…
By Franck Pachot . Two years ago I filled an OTN idea to ‘Constrain PDB datafiles into specific directory’ and made it an enhancement request for 12c Release 2. When you provision a PDB, the PDB admin can create tablespaces and put datafiles anywhere in your system. Of course this is not acceptable in a cloud environment. 12.1 has a…
By Franck Pachot . Now that 12.2 is there, in the Oracle Public Cloud Service, I can share the slides of the presentation I made for Oracle Open World: 12cR2 Single-Tenant: Multitenant Features for All Editions from Franck Pachot I’ll give the same session in French, In Geneva on November 23rd at Oracle Switzerland. Ask me if you want an…
By Franck Pachot . A common question is: how to know which indexes are not used, so that I can drop them. If you tried to use index monitoring you probably have seen the limits of it which make it difficult to use. It has been improved in 12.2 so let’s check if it helps to release the stress of…
By Franck Pachot . 12cR2 is there. What’s new in SQL*Plus? For sure, you can’t expect lot of things from it. The new command line is the SQL*Developer sqlcl which aims to be 100% compatible with SQL*Plus with lot of more features. However, a few little things came here: default editor, command line history and easy row/LOB prefetch and statement…
By Franck Pachot . Oracle database 12.2 is there on the Database Cloud Service, in multitenant. In EE High Performance or Extreme Performance, you have the multitenant option: you can create 4096 pluggable database (instead of 252 in 12.1). If you are in lower services, you can create only one user PDB (not counting application root and proxy PDB). If…
By Franck Pachot . Here is, in my opinion, the most beautiful feature of the multitenant architecture. You know how I love Transportable Tablespaces. But here: No need to put the source in read/only No need to export/import the metadata logically No need for any option: available even in Standard Edition Standard Edition I am in Standard Edition here in…
By Franck Pachot . In multitenant you session can switch between containers. For example, since 12.1, a common user can switch explicitly between CDB$ROOT and any PDB with the ‘ALTER SYSTEM SET CONTAINER’. Any user connected to a PDB will also have it session switching implicitely when querying through metadata links and data links (new name for object links). In…
By Franck Pachot . Pluggable Databases are supposed to be isolated, containing the whole of user data and metadata. This is the definition of dictionary separation coming with multitenant architecture: only system data and metadata are at CDB level. User data and metadata are in separate tablespaces belonging to the PDB. And this is what makes the unplug/plug available: because…
By Franck Pachot . Database links are resolved with the server TNS_ADMIN configuration (sqlnet.ora and tnsnames.ora). You can use tnsping to check the resolution, but it supposes that you are on the server and have set the same environment as the one which started the database. In 12.2 you have a new package to check that: DBMS_TNS. It’s the kind…
The second release of Oracle Database 12c (12cR2) comes with new improvements regarding partitioning. In this blog post I’ll show one of them : auto-list partitioning. Auto-list partitioning is an extension of list partitioning. It enable the automatic creation of partitions for new values inserted into the partitioned table. Image : “Oracle Partitioning in Oracle Database 12c Release 2” –…
