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.
My previous blog was about the MariaDB Galera cluster new features (version 10.4). Now I will only focus on the streaming replication and give you an overview of all the tests I performed. How to enable streaming replication? Quite easy, there are only 2 parameters: wsrep_trx_fragment_unit and wsrep_trx_fragment_size Then you have to choose a replication unit between the followings: .…
When I started to write the blog about AWS SSM I quickly realized that I need a way to bring up and destroy my AWS EC2 playground in an easy and reproducible way. There are several options for this: I could have used the AWS command line interface or AWS CloudFormation. Both work pretty well and would have been more…
Introduction I was reimaging an X6-2M ODA after various patching troubles, and everything was fine. After several databases created, the next ones could no more be created. DCS-10802: Insufficient disk space on file system: database. Expected free space (MB): {1}, available space (MB): {2} I’ve spent some time on it, and finally found the cause of the problem. And the…
As we have more and more customers either currently moving to AWS or already moved much, if not even all, of their workloads to AWS, one question pops up quite frequently: Now that we have so many EC2 instances up and running how do we regularly patch them? There are many tools around for patching operating systems, such as Microsoft…
Some of you may know the case: As soon as the number of users grow, the number of resource problems increases. Have you ever thought about using a connection pooler? Too complex, too much administration effort? In this post I like to explain, how the connection pooler can help you with your memory, as well as showing you the simplicity…
During the preparation of my presentation for the pgconf.eu I ran into one big issue. I had to stop my cluster to add a new node. That was not the way I wanted to archive this. I want a high availability solution, that can be scaled up without any outage. Due to a little hint during the pgconf.eu I was…
Last month, by a new customer I had to install the latest version of the MariaDB server: 10.4.8 to setup a Galera Cluster with 3 master nodes. The good news was that this version was shipped with the latest version of the Galera Plugin from Codership: Galera Cluster 4.0. As usual, installation & configuration was quitte easy. $ sudo yum…
[vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” overlay_strength=”0.3″ shape_divider_position=”bottom” bg_image_animation=”none”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_link_target=”_self” column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_width_inherit=”default” tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid” bg_image_animation=”none”][vc_column_text]In this blog I will show how to handle a PostgreSQL installation with a customized PGDATA using the packages provided by the PostgreSQL community. One issue with the packages is the hard coded PGDATA, which will be overwritten…
When I attended PGIBZ 2019 earlier this year, I talked with Dimitri about pg_auto_failover and I promised to have a look at it. Well, almost half a year later and after we’ve met again at pgconf.eu it is time to actually do that. You probably already know that citudata was acquired by Microsoft earlier this year and that Microsoft seems…
A couple of days ago, we upgraded some MariaDB instances on a consolidated database server. However, after the software update we were not able to manage our instances anymore using mysqld_multi whatever the MariaDB release (10.3.18 or the latest 10.4.x). Previously, everything worked fine with 10.3.14. So, what happened to our system? Lets’ quickly start an instance: mysql@vmoel:/u01/app/mysql/product/mariadb-10.3.18/bin/ [mysqld3] ./mysqld_multi…
Sooner or later all of us have to change a parameter on the database. But how is this put into execution when using a Patroni cluster? Of course there are some specifics you have to consider. This post will give you a short introduction into this topic. When you want to change a parameter on a Patroni cluster you have…
A lot of people use pgbench to benchmark a PostgreSQL instance and pgbench is also heavily used by the PostgreSQL developers. While declarative partitioning was introduced in PostgreSQL 10 there was no support for that in pgbench, even in the current version, which is PostgreSQL 12. With PostgreSQL 13, which is currently in development, this will change and pgbench will…
