PDB

Multitenant internals: object links on fixed tables

By Franck Pachot . The previous post partly answered to the original question (why an object link to V$SESSION is refreshed only every 30 seconds): recursive queries on shared=object views. Now let's see what is different(…)

Multitenant internals: how object links are parsed/executed

By Franck Pachot . I had a comment on object links internals when creating a sharing=object view on GV$SESSION. Before posting about this specific case, I realized that I've never explained how a query on(…)

Oracle Public Cloud patch conflict

By Franck Pachot . This morning I wanted to test a patch (18633374) in the Oracle Cloud Service. The DBaaS was created as an 'Enterprise Edition Extreme Performance' which comes with all options, including multitenant option. I applied my patch.

Oracle Multitenant feature name

By Franck Pachot . We all know what is the multitenant option: a container database (CDB) with multiple user pluggable databases (PDB). This requires Enterprise Edition plus option. But you can use the same architecture without the option and even(…)

Question is: upgrade now to 12.1.0.2 or wait for 12.2 ?

By Franck Pachot . Let's look at Release Schedule of Current Database Releases (Doc ID 742060.1) 12.2.0.1 is planned for 2HCY2016 on platforms Linux x86-64, Oracle Solaris SPARC (64-bit), Oracle Solaris x86-64 (64-bit). 2HCY2016 starts next(…)

ODA X6-2S and ODA X6-2M for EE and SE2

By Franck Pachot . After the announcement of the death of SE1 and SE we wondered what Oracle will do for Small and Medium Enterprises and entry level products. The answer was postgres the Oracle Cloud Services, but that's for(…)

DB_FLASHBACK_RETENTION_TARGET may hang your database

By Franck Pachot . DB_FLASHBACK_RETENTION_TARGET is set to keep enough flashback logs to be able to flashback database within the specified retention window. But it's supposed to be a target only, meaning that on space pressure some files can be(…)

Multitenant dictionary: what is stored only in CDB$ROOT?

By Franck Pachot . Multitenant architecture is about dictionary separation. The idea is that all system metadata is stored only in CDB$ROOT so that space and upgrade time are optimized. Is it entirely true? let's count the rows in the(…)

Single-Tenant vs. non-CDB: no reason to refuse it

By Franck Pachot . When non-CDB has been declared deprecated, I was a bit upset because multitenant with a lone PDB just looks like an overhead of 3 containers instead of one. But with experience I changed my mind. First(…)

Créer une base Oracle sur le Cloud en quelques clicks

By Franck Pachot . Il n'a jamais été aussi facile de créer une base Oracle. Et ceci grâce au Database as a Service (DBaaS). C'est l'occasion de tester le cloud: Oracle Cloud Service offre une version d'essai de un mois.