By Franck Pachot . I had a comment on object links internals when creating a sharing=object view on GV$SESSION. Before posting about this specific case, I realized that I’ve never explained how a query on an object link is run on the CDB$ROOT container. Data link testcase Here is how I create the DEMOT table and DEMOV view as object…
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. My test required to create a new tablespace but it failed with: ORA-65010: maximum number of pluggable databases created This…
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 in Standard Edition: a CDB with only one user PDB. It is called “single-tenant” or “lone PDB”. How do you…
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 week but we can imagine that it will not be released immediately and anyway we will have to wait a few months to download…
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 dev/test only because Public Cloud is not for production and SME will not build a Private Cloud for their few…
When you want to do instance caging, you have to set manually CPU_COUNT and to set a resource manager plan. If you By Franck Pachot . only the CPU_COUNT no instance caging will occur. Except during the maintenance window where the maintenance plan is set internally. You don’t want that kind of unpredictable behavior, so the recommandation is to always…
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 deleted. But be careful, there are cases where they are not and then the database hangs until you set a…
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 dictionary tables. In order to verify that, I’ve build a query that will count the rows from the dictionary tables,…
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 because the multitenant architecture brings some features that are available even without the option. And second, because this overhead is…
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. Si vous êtes proches de Genève, passez nous voir lors du SITB les 26-27 avril: https://www.dbi-services.com/fr/events-fr/swiss-it-business-sitb-du-26-au-27-avril-2016/ Mais j’ai aussi fait…
By Franck Pachot . When you create a DBaaS on the Oracle Cloud Service you have only one way to access to your database: ssh with the public rsa key you provide. Then you can open some ports to access the VM. However, from the VM you can’t access your own network. You need it to move data between from…
By Franck Pachot . Matching the Feature Usage Statistics to licensed options is not always easy. And once a feature usage is recorded, it is usually stored definitively. Let’s see how the multitenant option is recorded there. exec_db_usage_sampling I have a single-tenant database with only one user pluggable database: 16:19:20 SQL> show pdbs CON_ID CON_NAME OPEN MODE RESTRICTED ———-…
