PGConf.Russia 2023

How does network latency affect performance when using synchronous replication? If a primary node fails, how long will our cluster not be reachable? How much data can be lost? Will there be any anomalies when reading from standby? We are designing our network architecture, give us a minimum RTT value for cluster solution! Many DBAs have to face these issues when designing and implementing cluster solutions. In this short talk we will tell how to quickly estimate RTT, RTO, RPO values, with the help of which Open Source tools one can test cluster solution and experimentally verify the design parameters, which metrics values can be used as a guide in design.

Since PostgreSQL 9.5 logical replication has replication origin infrastructure for replication progress tracking. Now 16th version is coming with feature which made bi-directional replication setups possible using said infrastructure. In earliest reviews it got a nickname of "native multimaster" for cluster, interconnected with said replication, bearing some resemblance to PostgresPro's Multimaster. We're going to figure out degree of it and explain insides of them. Talk expects you to have a basic knowledge of WAL insides and it's role in PostgreSQL functioning.

A popular lecture with pictures illustrating the most powerful phenomena in the Universe that put space and time in an uncomfortable position and force them to reveal the secrets of the Universe to those who have an inquisitive mind and Postgres! The story of Mr. Lipunov, professor at Moscow State University, author of world-famous popular and scientific books, theorist, experimenter and creator of a network of astronomical robots.

In this talk I’ll show some new abilities in postgres observability. There will be Graphana visualization of pg_profile/pgpro_pwr data, manual highlighting of interesting objects in pg_profile/pgpro_pwr reports, further development of extended vacuum statistics in PostgresPro releases and a new session and query tracing technique in pgpro_stats extension