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.
PostgreSQL 13 is just around the corner and one little, but important feature that was added are trusted extensions. When you want to add an extension to a database you need to be superuser for most of the extension or you need to implement something like this (please also note the comment from Hans at the bottom of the blog).…
What if you could clone a PostgreSQL database instantly without affecting the original source database, without impacting performance, without any external tool but using your linux Btrfs storage layer. This is what I will demonstrate in the following blogpost. Introduction Sometimes developpers need urgently a copy of a PostgreSQL database where they can test new developments or make changes that…
In PostgreSQL you have several ways of working with files and you can find quite some examples here on our blog, e.g. Modifying pg_hba.conf from inside PostgreSQL, Can I do it with PostgreSQL? – 4 – External tables or Working with files on the filesystem in PostgreSQL. There is also copy which allows you to load or unload tables and…
Hi everybody, I get an issue on my VM today , so that I can’t open it anymore. When trying a system restore I get the same state. I was really embarrassed to fail to restore my VM (as a huge work was done on it) Below we will see how to fix this issue Issue description Investigations I have…
By Mouhamadou Diaw The ODA X4 is still in use for some customers. The last time I was asked to validate the backups . Let me explain the context. Actually the backups are done via RMAN on local in a NFS share. After these backups are backep up by Netback on tape. The goal was just to validate that the…
By Franck Pachot . I’ve always been working with databases. Before the cloud era, the most abstract term was “data”. A variable in memory is data. A file is data. A block of disk contains data. We often created a ‘/data’ directory to put everything that is not binaries and configuration files. I’ll always remember when I did that while…
Continuing from my first blog we will check some more access and authentication configurations. Focusing on removing unnecessary database privileges. After that we will configure the backend parameters correctly to have more robust PostgreSQL server/client sessions. And at last SSL encryption for these sessions will be configured. User access and authentication In my previous blog we already setup the pg_wheel…
Starting with PostgreSQL 13 there is a name and value change of one of the parameters used for the streaming replication of a replica server. Some may already know which parameter I am talking about. Until Postgres 12 it was called “wal_keep_segments” but with PostgreSQL 13 it will become “wal_keep_size”. In this small post I will explain, what changed and…
By Mouhamadou Diaw In an Oracle 20c Data Guard environment with a broker configured we can have following files called client-side broker files -The observer configuration file : observer.ora -The observer log file -The observer runtime datafile: fsfo.dat -The fast-start failover callout scripts (new feature in Oracle 20c) Before Oracle 20c, there was no default location for these files. Starting…
Last week the new Patroni 2.0 release was published which brings many new features. But one makes me absolutely curious. At the moment only as BETA, but I had to test it. Patroni on pure Raft. It’s possible to run Patroni without 3rd party dependencies. So no Etcd, Consul or Zookeeper is needed anymore. Great improvement! In this blog we…
In this Post you will learn how I met PostgreSQL and started to learn. If you are planning PostgreSQL as your database but don’t know where to start, this blog may help you. My background I have used MySQL database like an external hard drive, just to save and store the data from an application. Several times I installed on…
In my previous blog, I talked about how to install the latest MariaDB Community Server 10.5.5 on CentOS 8 but now I will talk about the latest version of MariaDB ColumnStore 1.5 which is not anymore a separate fork of MariaDB but rather a pluggable storage engine. This allows to move easily data from InnoDB to ColumnStore and it is…
