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Franck Pachot

Database is more than persistence. It is shared. My thoughts about Microservice Database.

By | Oracle | 4 Comments

By Franck Pachot . The development teams often see the database as a ‘persistence layer’ only. And sometimes it is mentioned that the database is always the cause of the problems, especially when implementing continuous integration and trying to be agile. Then cames the idea to have this ‘persistence layer’ in an isolated environment, such as a docker container, with the database for each developer. However, this overlooks the real cause of the problems, which…

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Franck Pachot

Autonomous Database

By | Oracle | 3 Comments

By Franck Pachot . Larry Ellison has announced Oracle 18c to be the Autonomous Database, the no-human labor, and self-driven, database. Here is a quick recap of what it is behind the marketing words. My opinion only.

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Franck Pachot

Am I a DBA 3.0 or just an SQL*DBA?

By | Oracle | 2 Comments

By Franck Pachot . There are currently a lot of new buzz words and re-namings which suggest that our DBA role is changing, most of them escorted with a #cloud hashtag. Oracle Technology Network is now called Oracle Developer Community. Larry Ellison announced the database that does not need to be operated by humans. And people talking about the death of DBA, about the future of DBA, about DBA 3.0,… Those are all generalizations and…

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Franck Pachot

Wrong result with multitenant, dba_contraints and current_schema

By | Oracle | No Comments

By Franck Pachot . Multitenant architecture is not such a big change and this is why I recommend it when you start a project in 12c or if you upgrade to 12.2 – of course after thoroughly testing your application. However, there is a point where you may encounter problems on dictionary queries, because it is really a big change internally. The dictionary separation has several side effects. You should test carefully the queries you…

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Franck Pachot

Active Data Guard services in Multitenant

By | Oracle | No Comments

By Franck Pachot . A database (or the CDB in multitenant) registers its name as the default service. When a standby database is on the same server, or same cluster, you have no problem because this database name is the db_unique_name which is different between the primary and the standby(s). In multitenant, in addition to that, each PDB registers its name as a service. But the PDB name is the same in the primary and…

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Franck Pachot

When PDB name conflicts with CDB name

By | Business Intelligence, Oracle | 3 Comments

By Franck Pachot . Going to multitenant architecture is not a big change. The administration things (DBA, monitoring, backups) connect to the CDB and the application things connect to the PDB. Without the multitenant option, it is still recommended to go to the CDB architecture. The non-CDB is deprecated and the multitenant architecture brings interesting features. People often ask how to name the CDB and the PDB, especially when they have naming rules or policies…

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Franck Pachot

Bequeath connect to PDB: set container in logon trigger?

By | Database Administration & Monitoring, Oracle | No Comments

By Franck Pachot . There are little changes when you go to multitenant architecture and one of them is that you must connect with a service name. You cannot connect directly to a PDB with a beaqueath (aka local) connection. This post is about a workaround you may have in mind: create a common user and set a logon trigger to ‘set container’. I do not recommend it and you should really connect with a…

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Franck Pachot

12cR2 PDB refresh as a poor-man standby?

By | Oracle | 7 Comments

By Franck Pachot . Disclaimer My goal here is only to show that the Refreshable PDB feature works by shipping and applying redo, and then can synchronize a copy of the datafiles. I do not recommend to use it for disaster recovery in any production environment yet. Even if I’m using only supported features, those features were not designed for this usage, and are quite new and not stable yet. Disaster Recovery must use safe…

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