By Franck Pachot . Many people complain about the quality of support. And there are some reasons behind that. But before complaining, be sure that you provide all information. Because one reason for inefficient Service Request handling is the many incomplete tickets the support engineers have to manage. Oracle provides the tools to make this easy for you and for…
By Franck Pachot . If you decide to capture SQL Plan Baselines, you achieve plan stability by being conservative: if the optimizer comes with a new execution plan, it is loaded into the SQL Plan Management base, but not accepted. One day, you may add an index to improve some queries. Then you should check if there is any SQL…
By Franck Pachot What I want to show in this blog post is that, as in mathematics where you have to apply some algebra rules to transform an equation to an equivalent one, the database developer must translate the business specification to an equivalent that is optimized (in performance, reliability and readability) for the data model. I was looking at…
By Franck Pachot . Let’s say you have a PEOPLE table with FIRST_NAME and LAST_NAME and you want, in many places of your application, to display the full name. Usually my name will be displayed as ‘Franck Pachot’ and I can simply add a virtual column to my table, or view, as: initcap(FIRST_NAME)||’ ‘||initcap(LAST_NAME). Those are simple SQL functions. No…
By Mouhamadou Diaw In Oracle 20c, we can now validate a Fast Start Failover configuration with the new command VALIDATE FAST_START FAILOVER. This command will help identifying issues in the configuration. I tested this new feature. The Fast Start Failover is configured and the observer is running fine as we can see below. 1 2 3 4 5 6 7…
By Mouhamadou Diaw As you may know, Oracle 20c is in the cloud with new features. The one I have tested is the PREPARE DATABASE FOR DATA GUARD. This command configures a database for use as a primary database in a Data Guard broker configuration. Database initialization parameters are set to recommended values. Let’s see what this command will do…
Introduction For years, Oracle used the same mechanism for database versioning. A major version, represented by the first number. And then a release number, 1 for the very first edition, and a mature and reliable release 2 for production databases. Both of them having patchsets (the last number) and regular patchset updates (the date optionally displayed at the end) to…
By Franck Pachot . With metered cloud services, keeping all your instances running may become expensive. The goal is to start them only when you need them. Here is a script that stops all instances you have on the Oracle Cloud Service PaaS. You can schedule it for example to stop them at the end of the business day, or…
By Franck Pachot . What is the most important part in an execution plan? It’s probably the predicate section. It helps to see implicit conversions. It helps to understand why an index is used or not. Or to see additional predicates coming from constraints. When you get an execution plan from shared pool, the dbms_xplan.display_cursor() shows the predicates. But when…
