Monitoring Database Activity
- Table of Contents
- 27.1. Standard Unix Tools
- 27.2. The Statistics Collector
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- 27.2.1. Statistics Collection Configuration
- 27.2.2. Viewing Collected Statistics
- 27.2.3. Statistics Functions
- 27.3. Viewing Locks
- 27.4. Dynamic Tracing
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- 27.4.1. Compiling for Dynamic Tracing
- 27.4.2. Built-in Probes
- 27.4.3. Using Probes
- 27.4.4. Defining New Probes
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 might be needed using PostgreSQL 's EXPLAIN command. Section 14.1 discusses EXPLAIN and other methods for understanding the behavior of an individual query.