PGConf.Russia 2021

In 2019 we migrated distributed railway application from Oracle 11g SE to vanilla PostgreSQL 11.9. Almost 2 years have passed, the system is working good. The report focuses on how we migrated, what problems we faced during this migration and after migration, as well as what we would have done differently today experience.

When working with PostgreSQL, we regularly encounter queries that take suspiciously long to be executed. What if it's too late to enable statistics or auto explain, and cancellation of the query doesn't look sensible, but you still need to find out what caused the issue or see at what stage execution the query is? pg_query_state is an open source PostgreSQL extension, which can give you access to the query execution plan in real time. It also makes available statistics for each node, including the number of processed rows.

Crew Resource Management is a field which has become critical in many fields including aviation and nuclear power. However in IT, this field has not been well implemented. In this talk we will discuss what crew resource management is, what kinds of problems it solves, and why all database teams should implement it.

Several PostgreSQL-related case studies will be discussed and both technical and human factors will be part of the case studies.

Mamonsu is an active monitoring agent for PostgreSQL based on Zabbix. Mamonsu 3.0 Major Update includes new metrics and more possibilities for data visualization via Zabbix screens. It also introduces the improved functionality of Mamonsu tools for interacting with the DBMS. In addition to the new functionality overview, I will also share the nuances of upgrading to the 3.0 version.