Tuesday, January 23

2ndQuadrant

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pgxc_ctl: Teaching Postgres-XL in New York City

2ndQuadrant, Tom's PlanetPostgreSQL
At the 2ndQuadrant PostgreSQL conference in New York City this year, I had the pleasure of delivering a training on Postgres-XL together with Andrew Dunstan. We capped the attendees at 8 because we wanted to have a lot of lab time with the students and spend time helping them get set up with Postgres-XL. The class sold out. We had attendees not only from New York City but also from other parts of the United States and one from Europe. I was honored to have folks travel so far to take the course Andrew and I put together, based on work Pavan Deolasee had done previously. We received a lot of positive feedback on the class. Andrew put together a script that enabled all the students to operate on  3 separate 5 node Postgres-XL clusters. Each of the students could of had their own 5 node (more…)

How long does it take to change your mind?

2ndQuadrant, Simon's PlanetPostgreSQL
You're clever, which means you're mostly right about things. But everybody is wrong sometime, so how long does it take for you to change your mind? People don't often change their minds quickly. A snap answer is always whatever you were thinking currently. If it was a No, you say No. If it was a Yes, you say Yes. If you answer too quickly you can't possibly have taken in what was being said to you. Can you change your mind? "When the facts change, I change my mind. What do you do, sir?", often misattributed to John Maynard Keynes. https://quoteinvestigator.com/2011/07/22/keynes-change-mind/ For Humans, changing your mind based on new information takes days or months. If you have emotional objections, it can take months or years. If anyone has research on that, I'd be interested (more…)

Oracle High Availability concepts in PostgreSQL

2ndQuadrant, Barman, PostgreSQL, Simon's PlanetPostgreSQL
Sometimes people ask about certain Oracle High Availability features and whether they exist in PostgreSQL. In most cases, very similar features exist. The reason for the similarity is that PostgreSQL and Oracle have very similar architectures and so the mechanisms to protect data have also developed along the same lines. For example, Oracle Data Guard is streaming replication of the transaction log, so is very similar in concept to physical streaming replication in PostgreSQL. Active Data Guard is where Oracle users can run queries on a standby server, which again is similar in concept to Hot Standby. Oracle RAC? You don't really need Oracle RAC. Or at least qualified Oracle experts tell me so and my own hands on experience confirms that. Not least because disaster recovery for (more…)

News and Roadmap for BDR (Multi-master PostgreSQL)

2ndQuadrant, Simon's PlanetPostgreSQL
Postgres-BDR is an open source project from 2ndQuadrant that provides multi-master features for PostgreSQL. We have pursued a joint strategy of providing both working code available now and also submitting the features into core PostgreSQL. Postgres-BDR 1.0 runs on a variant distro of PG9.4. This is in Production now and receives regular maintenance and security updates. 2ndQuadrant will support this until 9.4 End of Life in December 2019. One of the greatest achievements to come out of our work on BDR is the logical replication technology. Our engineers spent a considerable amount of energy to contribute the tech to PostgreSQL core and I feel especially proud that this is a headline feature of the upcoming PG10 release. And Now BDR 2.0 …  BDR 2.0 runs on community PG9.6 as (more…)

News and Roadmap from Postgres-XL 10

2ndQuadrant, Pavan's PlanetPostgreSQL
We expect Postgres-XL 10 to be released in the next few months, with the new features of partitioning and logical replication. You’ll be able to load Postgres-XL directly from PostgreSQL. For the first time, you’ll be able to run massively parallel queries both across the datanodes and within the datanodes to give huge performance gains. Earlier today, we updated the master branch of the Postgres-XL repository to include all commits from PostgreSQL's master branch up to June 26. That means the XL project is now fully to date with the PostgreSQL source code, meaning there is now only minimal lag between PostgreSQL and Postgres-XL. At this point the code is only in Development/Alpha, though we expect to produce Beta1 soon after PostgreSQL Beta 3 in August. Support from the (more…)

What’s new in Postgres-XL 9.6

2ndQuadrant, PostgreSQL, Tomas' PlanetPostgreSQL
For the last few months, we at 2ndQuadrant have been working on merging PostgreSQL 9.6 into Postgres-XL, which turned out to be quite challenging for various reasons, and took more time than initially planned due to several invasive upstream changes. If you’re interested, look at the official repository here (look at the “master” branch for now). There’s still quite a bit of work to be done - merging a few remaining bits from upstream, fixing known bugs and regression failures, testing, etc. If you’re considering contributing to Postgres-XL, this is an ideal opportunity (send me an e-mail and I’ll help you with the first steps). But overall, Postgres-XL 9.6 is clearly a major step forward in a number of important areas. (more…)

In the defense of sar (and how to configure it)

2ndQuadrant, PostgreSQL, Tomas' PlanetPostgreSQL
Let me discuss a topic that is not inherently PostgreSQL specific, but that I regularly run into while investigating issues on customer systems, evaluating "supportability" of those systems, etc. It's the importance of having a monitoring solution for system metrics, configuring it reasonably, and why sar is still by far my favorite tool (at least on Linux). (more…)

“Now is Better Than Never” – Why I decided to attend PyCon8…

2ndQuadrant, Britt's PlanetPostgreSQL
…and why I’m glad I did. It’s not all technical… Who knew?! Last year, Pycon7 was held right about the time I joined 2ndQuadrant. Seeing as I was new to the technology AND the Italian language (note: there was an English track), I opted out of attending. Well, after attending Pycon8, I can say that I won’t make that mistake again! Over the past year working in the Open Source community, I’ve learned more technical information than I could have ever imagined. Even then, attending a technical conference and understanding (completely) technical talks seemed a little far-fetched. Or so I thought! Since being introduced to the wonderful world of Open Source, PostgreSQL, and numerous other technologies - I’m continuously fascinated by the way that the communities (more…)

When autovacuum does not vacuum

2ndQuadrant, PostgreSQL, Tomas' PlanetPostgreSQL
A few weeks ago I explained basics of autovacuum tuning. At the end of that post I promised to look into problems with vacuuming soon. Well, it took a bit longer than I planned, but here we go. To quickly recap, autovacuum is a background process cleaning up dead rows, e.g. old deleted row versions. You can also perform the cleanup manually by running VACUUM, but autovacuum does that automatically depending on the amount of dead rows in the table, at the right moment - not too often but frequently enough to keep the amount of "garbage" under control. (more…)

2ndQuadrant – Not the Gartner Magic Quadrant

2ndQuadrant
It’s still appropriate though. Because that is what we are - thought leaders in open source PostgreSQL. But that's not what I am here to talk about. The name "2ndQuadrant" comes from "The Seven Habits of Highly Effective People" by Stephen Covey, specifically Habit 3 "Put First Things First", p.151. It refers to the classification of tasks in terms of 2 axes: Importance and Urgency. The second quadrant is the Important, Not Urgent quadrant. According to Covey, if you concentrate on doing work in that space, it leads to "vision, perspective, balance, discipline, control and few crises" - i.e. you focus on your long-term vision and your ability to execute short to medium term goals is also impeccable. These are all qualities highly valued by every individual at 2ndQuadrant; so (more…)