Book Image

PostgreSQL 10 High Performance - Third Edition

By : Enrico Pirozzi
Book Image

PostgreSQL 10 High Performance - Third Edition

By: Enrico Pirozzi

Overview of this book

PostgreSQL database servers have a common set of problems that they encounter as their usage gets heavier and requirements get more demanding. Peek into the future of your PostgreSQL 10 database's problems today. Know the warning signs to look for and how to avoid the most common issues before they even happen. Surprisingly, most PostgreSQL database applications evolve in the same way—choose the right hardware, tune the operating system and server memory use, optimize queries against the database and CPUs with the right indexes, and monitor every layer, from hardware to queries, using tools from inside and outside PostgreSQL. Also, using monitoring insight, PostgreSQL database applications continuously rework the design and configuration. On reaching the limits of a single server, they break things up; connection pooling, caching, partitioning, replication, and parallel queries can all help handle increasing database workloads. By the end of this book, you will have all the knowledge you need to design, run, and manage your PostgreSQL solution while ensuring high performance and high availability
Table of Contents (18 chapters)

Crash recovery and the buffer cache

If you had to write out every database change to disk immediately after it's made, the database performance would really suffer. This is particularly true on blocks that you change all the time, which would then be written very often. But, you have to be able to recover if the server crashes before things are written out completely too. Periodic database checkpoints take care of that.

Checkpoint processing basics

A checkpoint iterates over every dirty block in the system as of a point in time, writing them out to disk. Then, that information is flushed to permanent storage, via the same mechanisms WAL writes are. Once that's done, if your system crashes, recovery from the crash...