Monthly Archives: July 2019

PostgreSQL And Academia

Recently I’ve been thinking a lot about relationships between the PostgreSQL community and the DB research community. To put it bluntly – these two communities do not talk to each other!

There are many reasons why I am concerned about this situation. First, I consider myself belonging to both of these communities. Even if right now I am 90% in industry, I can’t write off my academic past and writing a scientific paper with the hope of being accepted to the real database conference is something which appeals to me.

Second, I want to have quality candidates for the database positions when I have them. The problem is more than scientists do not speak at the Postgres conferences, and Postgres developers do not speak at the academic conferences. The bigger problem is that for many CS students, their academic research and practical experience to not intersect at all! They study some cool algorithms, and then they practice their SQL on MySQL databases, which as I have already mentioned multiple times, lacks so many basic database features, that it hardly can be considered a database!

If these students practiced using PostgreSQL, they would have a real full-scale object-relational database, not a “light” version, but a real thing, which supports tons of index types, data types, constraints, has procedural language, and the list can go on and on.

It is especially upsetting to see this disconnect since so many database researches were completed on Postgres, for Postgres, with the help of Postgres; R-trees and GIST indexes, to name a couple. Also, the SIGMOD Test of Time Award in 2018 was given to the paper “Serializable isolation for snapshot databases”, which was implemented in Postgres.

I know the answer to the question “why they do not talk?” Researches do not want to talk at the Postgres conferences, because those are not scientific conferences, and the participation in these conferences will not result in any publication. Postgres developers do not want to talk at the CS conferences, because they do not like to write long papers :), and also, even if they do submit something, their papers often are rejected as “not having any scientific value.”

I know the answer. But I do not like it :). So maybe – we can talk about it?!

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Filed under research, SQL, Systems

Let’s Go Bitemporal!

Dear friends and followers from the Postgres community! Today, let’s talk more about the bitemporal library (as if I did not speak enough about it yet!).

We have been developing Postgres functions, which support bitemporal operation for almost four years by now. We have found our initial inspiration in the Asserted Versioning Framework (AVF), first introduced by Jonson and Weiss nearly twenty years ago. There is nothing new in the concept of incorporating time dimension into data, and even the concept of two-dimensional time is not new. However, we believe that AVF approaches the task in the best possible way and that it allows making the time a true and integral part of data.

We believe that Postgres is suited the best to support a two-dimensional time due to the tow factors: the presence of the interval types and GIST with exclusion constraints. Having these two available made the process of implementation of the concept more or less trivial.

Implementation of bitemporal operations took some time, though, and we are still in the process of improving some of the functions. However, we are happy to share with the world, that Bravinat Holdings runs both OLTP and OLAP databases on the bitemporal framework with no performance degradation. Since we had an opportunity to develop as we go, we could address lots of issues in this implementation, which we initially did not even expect.
Recently we have uploaded several files into the docs section of the pg_bitemporal GitHub repo, including several presentations and short papers so that those who are interested can read more on the theory of bitemporality. We hope that people will give it a try – it works! Also, we are always looking for volunteers who will be interested in collaboration.

Please check us out at https://github.com/scalegenius/pg_bitemporal

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July Chicago PUG was a success!

We had a great meetup of Chicago PUG last night with the first appearance of YugaByte DB. Thank you so much, Amey Banarse, for a very informative and engaging presentation!
Please take notice that there will be no meetup in August – enjoy the rest of the Summer, and I will see you all in September. Watch for the announcement!

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PG Open submission deadline is extended!

To all my Postgres-minded friends and colleagues – the submission deadline for PG Open talks and tutorials has been extended. You have till July 7 to submit your proposal! See updated info.
Please consider, if you didn’t submit yet!

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