PGConf.Online 2021

There's a common delusion that constraints should never be used as they affect performance in a negative way, interfere with regular work, and are, all in all, useless. The database is commonly perceived as just a storage without any logic. I'll explain why it isn't so and what this careless approach may lead to.

High availability solutions have become extremely popular in the past few years. They play a critical role in building reliable systems based on affordable hardware. In this presentation, we will pay attention to some of the subtle aspects of the design and maintenance of such systems. In addition, the issues of capturing changes on a HA cluster will be addressed.

PostgreSQL has a long history in DWH. Netezza, Redshift, and Greenplum have turned specific PostgreSQL releases into DWH solutions. Nowadays, with the trends in PostgreSQL towards performance improvements (better partitioning, better statistics, JIT Compilation, etc.) and advanced PostgreSQL extensions, like the Swarm64 Data Accelerator, you can create a forward-looking, no lock-in, versatile, and reliable DWH. This talk will cover the PostgreSQL and DWH trends and touch on key arguments for choosing open source PostgreSQL for DWH.

Okko is one of the largest legal online cinemas in Russia. Our catalog contains 60 000 movies, cartoons and TV series. Since its starting, the service has been visited by over 20 million users. The monthly audience is 2.8 million people. All these figures speak of a reliable high-load service.

As DBA, I will mainly talk about databases (PostgreSQL, Cassandra, Redis) that are used in the company. We'll take a closer look at PostgreSQL on the topics of high loads, monitoring, optimization, backup and recovery.