Database management

Introducing high-availability with SQL Server on Linux

A couple of months ago, I did my first installation of SQL Server on Linux. I wrote about it in this blog post. So(…)

Oracle 12cR2 – DataGuard Switchover with Oracle Wallets

By William Sescu I would like to make my DataGuard environment more secure, by eliminating the typing of “connect sys/Manager1” for my DGMGRL commands. Especially the ones, that I have in my scripts. For example: oracle@dbidg01:/home/oracle/ [DBIT122] dgmgrl <<-EOF >(…)

Oracle 12cR2 – How to Setup DataGuard observer with Oracle Wallets

By William Sescu I am not a big fan of having passwords in clear text laying around. This applies not only to application servers, but also for my Data Guard observer. I do have a script for starting the observer(…)

MS Cloud Summit Paris 2017

Une nouvelle année commence et 2017 devrait être un bon cru dans le domaine de la base donnée notamment en prédiction des effets d’annonces faites par Microsoft cette fin d’année 2016. En effet, il a été notamment été question de la prochaine(…)

SQL Plan Directives in 12cR2. Behavior is different than in 12cR1.

During the Frankfurter IT Tage I provided a presentation about SQL Plan Directives and how to reproduce a testcase in a test environment for a plan with used SQL Plan Directives (SPD). In that context I did a couple of(…)

Oracle 12cR2 – DataGuard and TCP.VALID_NODE_CHECKING

By William Sescu Security is a quite important topic, especially when running Oracle in the cloud. To make your DataGuard a little bit more secure, you can enable the TCP.VALIDNODE_CHECKING feature. I call it SQL*Net Firewall. Enabling the SQL*Net Firewall(…)

Oracle 12cR2 – Is the SYSDG Administrative Privilege enough for doing Oracle Data Guard Operations?

By William Sescu For security reasons, you may want that your DataGuard operations are done with a different UNIX user and with a different Oracle user which is not so highly privileged like the SYSDBA.  This is exactly where the(…)

Oracle 12cR2 – DataGuard and the REDO_TRANSPORT_USER

By William Sescu In a DataGuard environment, by default, the password of the SYS user is used to authenticate redo transport sessions when a password file is used. But for security reasons you might not want to use such a(…)

Running a Cassandra cluster in a single server

This blog post is about the configuration of Apache Cassandra for running a cluster of 3 instances on a single host. Basically C* is not really build to run in a multi instances environment, but for many cases and reasons(…)

Apache Cassandra overview

Apache Cassandra is one of the most popular NoSQL databases http://db-engines.com/en/ranking. It is used by many big companies as Facebook, Netflix and many others. Initially the project was initiated by Facebook. In combination with Google BigTable and Amazon DynamoDB,(…)