Table of Contents
pg_stat_activity pg_stat_replication pg_stat_replication_slots pg_stat_wal_receiver pg_stat_recovery_prefetch pg_stat_subscription pg_stat_subscription_stats pg_stat_ssl pg_stat_gssapi pg_stat_archiver pg_stat_io pg_stat_bgwriter pg_stat_checkpointer pg_stat_wal pg_stat_database pg_stat_database_conflicts pg_stat_all_tables pg_stat_all_indexes pg_statio_all_tables pg_statio_all_indexes pg_statio_all_sequences pg_stat_user_functions pg_stat_slru 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 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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