Oracle Database as our consultants live it every day: installation and patching, upgrades, RMAN backup and recovery, Data Guard, RAC, performance tuning, multitenant, licensing, and engineered systems such as ODA and Exadata.
By Franck Pachot . Did you ever encounter unexplained Oracle lock issues? They may be coming from unindexed foreign keys (which is worse in 11g). It’s not easy to monitor. Of course you can check Oracle locks from V$LOCKED_OBJECT, but that is a solution only for locks that remain. Some Oracle locks are there only for a short duration. How do you…
By Franck Pachot . Oracle has announced a big feature that should come in the next 12c patch set: the In-Memory option. It will soon be in beta version, so nothing will be published about it until it comes to production. Before that phase, I’m going to explain what we can expect from that feature, besides the ‘In-Memory’,’columnar storage’, and…
By Franck Pachot . Disclaimer: I’ll talk about an undocumented feature that appeared in Oracle 12c – undocumented except if you consider that being exposed in DBA_SEQUENCES as the PARTITION_COUNT is a kind of documentation. So, as the syntax is not documented (I got it only by guessing), you should not use it in production: there are probably some reasons…
By Franck Pachot . Je viens d’assister au Webinar Zero Downtime Migration pour Oracle, présenté par Chris Lawless qui est récemment passé de Product Manager Golden Gate à Product Manager Dbvisit. Je vais détailler ici un point très important évoqué par Chris Lawless. La migration par réplication n’est pas seulement envisagée pour éviter un arrêt de service. Arrêt nécéssaire lors…
By Franck Pachot . sqlplus / as sysdba oradebug setmypid oradebug unlimit oradebug hanganalyze 3 oradebug dump ashdumpseconds 30 oradebug dump systemstate 266 oradebug tracefile_name Your Oracle database – production DB, of course – is hanging. All users are blocked. You quickly check the obvious suspects (archivelog destination full, system swapping, etc.) but it’s something else. Even you, the Oracle…
By Franck Pachot . Do you use ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY for your Oracle databases in Data Guard? Maybe you also use the Fast Recovery Area as archive log destination. That’s good practice! But did you ever check that it works as expected? What I mean is this: The archived logs that you don’t need are…
By Franck Pachot . Because people know that I really like Oracle AWR reports, they send them to me from time to time. Here is one I have received for Christmas with the following question: ‘Since our AIX server is virtualized, the response times are 4x longer. I feel that we are CPU bound, but cpu usage is mostly idle.…
The choice of the correct character set before you create an Oracle 12c database is an important decision. You have to know the type of data you have to store and the languages needed by the Oracle database. Oracle recommends to choose Unicode for its universality and compatibility. It supports all written languages and most of the technical and scientific…
La version 12c d’Oracle Grid Infrastructure introduit de nombreuses nouveautés dans le support d’ACFS, le système de fichiers clusterisés d’Oracle. Nous abordons dans ce posting la capacité d’ACFS d’être le système de fichier de votre base de données ainsi que sa capacité de mise en œuvre des snapshots. Rappel sur ACFS Ce système de fichier est apparu avec la version 11.2 du…
More and more resources are used in companies to manage data. Most companies buy more and more storage systems because of poor resource utilization. Starting with Oracle 11g, Oracle has introduced Information Lifecycle Management (ILM) which can use different kinds of storage with varying performances in order to increase cost savings. In Oracle 12c, ILM now allows the automation of the…
In my consultant’s activity at dbi services, I had the opportunity to test the new databasion version Oracle 12c. As an Enterprise Manager Cloud Control 12c fan, when the 12.1.0.3.0 Oracle database plugin was made available, I decided to test the Cloud 12c behavior with the Oracle 12c database and also CDB and PDB (Container Database and Pluggable Database). Before…
La nouvelle version d’Oracle SQL Developer (version 3.0.03.45) est prête pour les administrateurs de base de données/DBA (voici une vidéo sur cette version). Elle s’est vue agrémentée d’outils nécessaires aux tâches d’administration. Les tests ci-dessous vous présentent, à travers quelques copies d’écrans, les fonctionnalités de l’outil, en espérant vous donner l’envie de l’adopter.
