Chapter 24. Monitoring Database Activity

Table of Contents
24.1. Standard Unix Tools
24.2. The Statistics Collector
24.2.1. Statistics Collection Configuration
24.2.2. Viewing Collected Statistics
24.3. Viewing Locks

A database administrator frequently wonders, "What is the system doing right now?" This chapter discusses how to find that out.

Several tools are available for monitoring database activity and analyzing performance. Most of this chapter is devoted to describing PostgreSQL's statistics collector, but one should not neglect regular Unix monitoring programs such as ps, top, iostat, and vmstat. Also, once one has identified a poorly-performing query, further investigation may be needed using PostgreSQL's EXPLAIN command. Section 13.1 discusses EXPLAIN and other methods for understanding the behavior of an individual query.