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 gives you the possibility for two-phase commit. You’ll might need that if you want an atomic distributed commit. If you check the PostgreSQL documentation there is a clear warning about using these kind of transactions: “Unless you’re writing a transaction manager, you probably shouldn’t be using PREPARE TRANSACTION”. If you really need to use them, you need to be…
During the installation of a new SQL Server environment in a Project, we wanted to automate the whole process deployment and configuration when installing a new SQL Server Always On Availability Group (AAG). This installation requires to prestage cluster computer objects in Active Directory Domain Services, called Cluster Name Objects (CNOs) and Virutal Computer Objects (VCOs). For more information on…
Introduction ODA started to become popular with X3-2 and X4-2 in 2013/2014. These 2 ODAs were very similar. The X5-2 from 2015 was different with 3.5 inches disks instead of 2.5 inches and additional SSDs for small databases (FLASH diskgroup). All these 3 ODAs were running 11gR2 and 12cR1 databases and were managed by the oakcli binary. If you’re still…
Introduction In this blog post, I will demonstrate how the Resumable capability of Online index rebuild operation can help you to keep the transaction log file size under control. An index rebuild operation is done in a single transaction that can require a significant log space. When doing a Rebuild on a large index the transaction log file can grow…
Often there is the requirement to populate a test or development database with data from production, but this comes with a risk: Do you really want, that developers or testers have access to sensitive data? In a lot of companies this might not be an issue, but for others, sensitive data must not be available to any other database than…
By Franck Pachot . This extends a previous post (Rolling Invalidate Window Exceeded) where, in summary, the ideas were: When you gather statistics, you want the new executions to take into account the new statistics, which means that the old execution plans (child cursors) should be invalidated You don’t want all child cursors to be immediately invalidated, to avoid an…
Coming back to the last post: 8000 databases in one PostgreSQL cluster?. As we’ve seen this is doable but comes with a lot of pain points. Another solution for this kind of requirement would be to host 8000 PostgreSQL clusters on one host. Again, I am not saying this is something you should do, and again, this is not how…
This is the next post in this little series about PostgreSQL on FreeBSD. You can find the previous one here: PostgreSQL on FreeBSD, getting started PostgreSQL on FreeBSD, updating & configuration PostgreSQL on FreeBSD, installation from packages The downside with installing from packages on FreeBSD is, that you can only run one version of PostgreSQL. If you want to run…
In the last two posts we installed FreeBSD, configured networking, updated the system, installed bash and had a quick look at kernel parameters. In this post we’ll install PostgreSQL from packages. Of course you can also install PostgreSQL from source code, but this will be the topic for the next post. We already used the “pkg” command in the last…
In the last post we installed FreeBSD, configured the keyboard, time zone and the first network interface, which gets it’s IP address via DHCP. In this post we’ll look at how we can configure the second interface, which gets a static IP address in the host only network. Once we’ve done that, we’ll update the system to the latest packages,…
By Franck Pachot . I’ve recently looked at Grafana. Pros: it is really nice, I mean aesthetically. If you want to build a dashboard for your boss, or put it on a large screen in the open space, that’s beautiful. Cons: not mature. I’m working for years with technology that works. When I have a problem, I find the solution…
Although we are running PostgreSQL mostly on Linux distributions, you can install an run PostgreSQL on a lot of other operating systems. On of them is FreeBSD. FreeBSD is one of those Unixes that derived from the Berkeley Software Distribution (BSD) and it is well known for having very few security issues and it is running a wide range of…
