PostgreSQL

Table of Contents

28.1. Standard Unix Tools

28.2. The Cumulative Statistics System

28.2.1. Statistics Collection Configuration

28.2.2. Viewing Statistics

28.2.3. pg_stat_activity

28.2.4. pg_stat_replication

28.2.5. pg_stat_replication_slots

28.2.6. pg_stat_wal_receiver

28.2.7. pg_stat_recovery_prefetch

28.2.8. pg_stat_subscription

28.2.9. pg_stat_subscription_stats

28.2.10. pg_stat_ssl

28.2.11. pg_stat_gssapi

28.2.12. pg_stat_archiver

28.2.13. pg_stat_bgwriter

28.2.14. pg_stat_wal

28.2.15. pg_stat_database

28.2.16. pg_stat_database_conflicts

28.2.17. pg_stat_all_tables

28.2.18. pg_stat_all_indexes

28.2.19. pg_statio_all_tables

28.2.20. pg_statio_all_indexes

28.2.21. pg_statio_all_sequences

28.2.22. pg_stat_user_functions

28.2.23. pg_stat_slru

28.2.24. Statistics Functions

28.3. Viewing Locks

28.4. Progress Reporting

28.4.1. ANALYZE Progress Reporting

28.4.2. CREATE INDEX Progress Reporting

28.4.3. VACUUM Progress Reporting

28.4.4. CLUSTER Progress Reporting

28.4.5. Base Backup Progress Reporting

28.4.6. COPY 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 cumulative statistics system, 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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