J’ai eu le plaisir de suivre une formation chez Oracle University à Colombes (Paris). En tant que stagiaire, le cours s’intitulait Oracle Weblogic Administration Essential. Ce post traite de la notion de cluster Weblogic. J’y expose les avantages du clustering weblogic, les principaux éléments à connaître ainsi qu’un exemple de configuration via la console d’administration.
Last week, from Wednesday to Friday we had the pleasure to welcome Martin Bach an OAK table member, also Oracle Certified Master and Oracle ACE, for an Oracle Grid Infrastructure training.
Since the third CTP version of SQL Server 2012 codename Denali, you have some features available to provide an additional value for Microsoft® SQL Server 2012 like the other SQL Server versions. This Feature Pack or Manageability Tool Kit are available but are not the final version. I have compiled all information in this blog to find it easily.
All DBA should know that Feature Pack exists, how to find it and of course use it.
Le marché du Database Activity Monitoring (DAM) devenant de plus en plus important avec des produits tels que Imperva, Guardium ou Sentrigo, je me suis intéressé au produit Oracle Database Firewall, qu’Oracle présente comme un substitut aux différents acteurs du marché des DAMs.
Starting with MySQL 5.5 it is possible to configure semi-synchronous replication. As you probably know, by default, MySQL replication is asynchronous. Asynchronous replication means that events/transactions applied on one server are not immediately applied on the other one. In the specific context of MySQL such behavior means that the MySQL Master writes transactions/events to the local binary logs, however it has no idea when the slave(s) will get and process them. Of course such configuration can lead, in case of failover, to some transaction loss since there is no guaranty that the transactions have been transmitted on the standby server(s).
I’m pretty sure that most of you already struggled with some low performance systems. In order to analyse such cases several tools and utilities, like top, nmon, fuse or lsof are available under Linux. However trying to dig in processes analysis and looking for files and processes relations may be quite painful.
To get started with performance checks and analysis, a interesting utility is available: htop
I have seen at a customer that the SQL Server’s policy doesn’t follow the Microsoft’s recommendations about antivirus and databases(kb 309422), such excluding *.mdf,*.ndf and *.ldf files. In addition the policy for Oracle doesn’t exist in case of Forefront Endpoint Protection 2010 known as FEP 2010.
I have decided to create databases policies for FEP optimized by dbi services to be generic and adapted to all SQL Server and Oracle environments.
Oracle SQL Developer and Data Modeler are becoming more and more popular as they are both cost-free and available on many Operating Systems (Linux/Unix,Windows and Mac) with different installation types: “This zip does not include JRE” or “This zip file includes the JRE”. On linux, the choice is limited because the only version available doesn’t include Java Runtime Environment. And it’s an RPM !! So what… In this post I will provide all information required to install and run these tools on an Ubuntu machine.
Dynamic management views (DMVs) return server state information that can be used to monitor the health of a server instance, diagnose problems and tune performance.
Since few months, I test the future new version SQL Server 2012 codename Denali and I was very surprised form the news DMVs from this version.
I will just explain some DMVs very interesting for a DBA.
My article is based on msdn web site reference and you find in the end from each chapter a msdn reference for more details of the DMV.