GPU-версия PostGIS и индекса GiST

This talk introduces GPU version of PostGIS and GiST-Index that we have developed as a new feature of PG-Strom.

Nowadays, our devices (like mobile phones) generate geolocational data time-by-time, and it is often utilized for area-marketing, push-delivery, disaster notification, and so on. People often use GIS technology to pick up users based on their current location. Even if area definitions are complicated polygons, PostGIS functions can generate right intersections, however, it is often highly computing intensive workloads.

GPU is designed for massive parallel computing workloads, with more than thousands cores per chip. And, we have developed PG-Strom extension to run a part of SQL workloads on GPU devices. At the upcoming PG-Strom v3.0, it newly supports several PostGIS functions and GiST-index for the computing intensive geolocational workloads.

In this talk, we will introduce the technology background, usage, implementation and benchmark result of GPU version of PostGIS and GiST-Index.

Консенсус, Postgres, Мультимастер

Postgres Pro Multimaster is Postgres extension (and a set of core patches) providing high availability (HA) with strong consistency and read scalability. It forms symmetric shared-nothing cluster synchronously replicating the data and automatically performing disaster recovery. During the last year we've put significant efforts ensuring and proving that consistency is preserved in all scenarios. The new version, which will be released as part of Postgres Pro Enterprise 13 uses Paxos algorithm for determining transaction outcome and custom protocol governing the recovery process; we used TLA+ model checker to verify its correctness. I'll tell how these things work and why in some cases multimaster may be an attractive alternative to the traditional streaming replication based HA deployments.

multimaster is now open source, available at https://github.com/postgrespro/mmts

To make the talk less narrow specialized and more appealing to the wide audience, in the first part I will shed some light on how generally modern DBMSs (mostly so-called NewSQL) handle fault tolerance. In particular,

• what is a strongly consistent DBMS and the associated overhead;
• what is distributed consensus, Paxos, Raft;
• how they help here;

I won't do an attempt to explain any algorithms line-by-line; it would be hardly useful given the time frames and there is a lot of literature available anyway. The goal is rather to waymark the field and get you a bit comfortable there.

Над пропастью WAL-G

What do we expect from a backup system? What makes a good backup system stand out? And, most importantly, how do you select the right tools for this process? When preparing backups, many pressing questions arise. In my talk, I will tell you a story of building a system for taking and verifying backups in one company. We will discuss the issues of choosing a tool for working with backups, adapting to changing realities, the problems of cloud storage, and the limitless possibilities of open-source collaboration. This talk will comprise the experience I gained in two years. You'll take the same journey, but much faster. Welcome aboard!

PostgreSQL и стандарты SQL

PostgreSQL is one of the most standards-compliant databases available. Talk discusses the impact that PostgreSQL has made on the SQL Standard and the features PostgreSQL has implemented from the SQL Standard, as well as upcoming features in PG14 and beyond.