When you install SQL Server, you have to consider how to place the database files. At this point you will probably meet the well-known best practices and guidelines provided by Microsoft but are you really aware of the storage vendor guidelines? Let’s talk about it in this blog post. A couple of weeks ago, I had the opportunity to implement…
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…
A few weeks ago, I posted an article about Oracle Database Appliance, focusing on ODA version 2.5.0.0.0. However, a new update of ODA, version 2.5.5.0.0, was released by Oracle on 5 March. This posting will focus on the new ODA release, which leads to a new hardware architecture. So, what’s new with this new ODA version? According to the Release…
In march 2011, my colleague Gregory Steulet published an article about Simulating and testing I/O performances with Orion. In this article, he wrote about a bug concerning Orion on Oracle 11.2, reported in Oracle bug number 9104898: “ORION FAILS WITH ORA-27061: WAITING FOR ASYNC I/OS FAILED”. Trying to compare performances of storage devices on a virtual machine between a classical…
I recently talked to a customer about SnapManager, its recommendation on the number of databases and about a way to prevent the creation of more than 35 databases. The NetApp recommendation is no more than 35 databases on a single volume. The reason is that SQL Server has to use 4-5 worker threads per database in order to manage the…
Dans mon dernier article sur PostgreSQL, j’ai présenté l’installation du logiciel en explorant les 2 solutions suivantes, l’installation Debian et l’installation EntrepriseDB. Ces deux installations créent immédiatement un cluster de base de données, Debian nous imposant le point de stockage et EntrepriseDB nous proposant de saisir une destination. Je vous propose maintenant d’explorer ce qui a été installé sur votre
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What is finally the primary objective of a database? Storing Data 
The question is, how Oracle makes it. For many beginners a confusing topic is
to get the picture between physical storage and logical one. So how does it works?
