PostgreSQL

Table of Contents

28.1. Standard Unix Tools

28.2. The Statistics Collector

28.2.1. Statistics Collection Configuration

28.2.2. Viewing Statistics

28.2.3. Statistics Functions

28.3. Viewing Locks

28.4. Progress Reporting

28.4.1. VACUUM Progress Reporting

28.5. Dynamic Tracing

28.5.1. Compiling for Dynamic Tracing

28.5.2. Built-in Probes

28.5.3. Using Probes

28.5.4. Defining New Probes

A database administrator frequently wonders, “[.quote]#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 might be needed using PostgreSQL’s EXPLAIN command. Section 14.1 discusses EXPLAIN and other methods for understanding the behavior of an individual query.

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