Everything our consultants learn while running databases for customers: Oracle, PostgreSQL, SQL Server, MySQL, MariaDB, MongoDB and Delphix. Expect hands-on posts about installation, day-to-day administration, backup and recovery, performance tuning, replication and upgrades.
When doing a performance review I often do talk with the DBA about the CPU utilization of the server. How reliable is the server CPU utilization with tools like top or the host CPU utilization in the AWR-report? E.g. on an Linux Intel x86-64 server with 8 Cores and 16 logical CPUs (Intel Hyperthreading), what does a utilization of 50%…
Below a workaround is shown how to “duplex” archivelog backups between disk and tape: Backup on disk (normal way): backup device type disk archivelog all; Immediately backup on tape: backup device type sbt archivelog until time ‘sysdate’ not backed up 2 times; This backup command backs up all archivelogs, that are not backed up twice, so all which…
SQL Server Management Studio is a well know integrated environment used to manage SQL Server infrastructure. This new version 17.4 can support SQL Server from 2008 up to 2017. It enhances existing features like Showplan, XE Profiler (complete list here) but also add an interesting one which is the Vulnerability Assessment. Vulnerability Assessment will scan a database in order to…
By Mouhamadou Diaw In a precedent blog I shown a basic utilization of PgBackRest which is a tool to backup and restore PostgreSQL databases. In this blog I am going to talk some useful features of this tool. In practical examples we will see some tasks we can do with this tool. Of course the official documentation remains the best…
By Franck Pachot . Do you have complex connection strings with DESCRIPTION_LIST, DESCRIPTION, ADDRESS_LIST, ADDRESS and a nice combination of FAILOVER and LOAD_BALANCE? You probably checked the documentation, telling you that FAILOVER=YES is the default at all levels, but LOAD_BALANCE=YES is the default only for DESCRIPTION_LIST. But when disaster recovery and availability is concerned, the documentation is not sufficient. I…
By Franck Pachot . In my opinion, the volume of logging (aka redo log, aka xlog, aka WAL) is the most important factor for OLTP performance, availability and scalability, for several reasons: This is the only structure where disk latency is a mandatory component of response time This is a big part of the total volume of backups This is…
By Mouhamadou Diaw Many tools can be used to backup PostgreSQL databases. In this blog I will talk about PgBackRest which is a simple tool that can be used to backup and restore a PostgreSQL database. Full, differential, and incremental backups are supported. In this first blog I will present a basic configuration of pgbackprest. Our configuration is composed of…
Let’s continue with this blog post series about SQL Server and Docker. A couple of days ago, I was in a customer shop that already implemented SQL Server 2017 on Linux as Docker containers. It was definitely a very interesting day with a lot of customer experience and feedbacks. We discussed with him about lot of architecture scenarios. The interesting…
Introduction As a former Oracle LMS qualified auditor my opinion is sometimes requested before/during/after an Oracle LMS audit or simply to ensure a customer that his Oracle database is 100% in conformity with Oracle Licensing Policy. Even if “The Oracle License Management Services (LMS) Group is the only Oracle group authorized to review and provide opinions on compliance status and…
Docker becomes more and more popular these days and a lot of companies start to really use it. At one project we decided to build our own customized Docker image instead of using the official PostgreSQL one. The main reason for that is that we wanted to compile from source so that we only get want is really required. Why…
Le 25 mai 2018 entretra en application le Règlement Général sur la Protection des Données (RGPD). Il impactera toutes les entreprises opérant du traitement de données à caractère personnel sur des résidents européens. A l’aube de cette échéance, beaucoup de fausses informations circulent au sein des entreprises suisse. L’objectif de ce blog est d’apporter quelque lumière sur les questions qui…
By Franck Pachot . Here is a little script I use from time to time to look at V$MYSTAT values and displaying on one line a set of statistics with their delta value between two calls. The first script, _mystat_init.sql, initializes the variables. The second one displays the values, such as: SQL> @ _mystat_diff.sql db block changes redo size…
