PostgreSQL 8.3.1 Documentation
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# 18.8. Run-Time Statistics

## 18.8.1. Query and Index Statistics Collector

These parameters control server-wide statistics collection features. When statistics collection is enabled, the data that is produced can be accessed via the `pg_stat` and `pg_statio` family of system views. Refer to Chapter 26 for more information.

`track_activities` (`boolean`)

  Enables the collection of information on the currently executing command of each session, along with the time at which that command began execution. This parameter is on by default. Note that even when enabled, this information is not visible to all users, only to superusers and the user owning the session being reported on; so it should not represent a security risk. Only superusers can change this setting.

`track_counts` (`boolean`)

  Enables collection of statistics on database activity. This parameter is on by default, because the autovacuum daemon needs the collected information. Only superusers can change this setting.

`update_process_title` (`boolean`)

  Enables updating of the process title every time a new SQL command is received by the server. The process title is typically viewed by the `ps` command, or in Windows by using the Process Explorer. Only superusers can change this setting.

## 18.8.2. Statistics Monitoring

`log_statement_stats` (`boolean`)
`log_parser_stats` (`boolean`)
`log_planner_stats` (`boolean`)
`log_executor_stats` (`boolean`)

  For each query, write performance statistics of the respective module to the server log. This is a crude profiling instrument. `log_statement_stats` reports total statement statistics, while the others report per-module statistics. `log_statement_stats` cannot be enabled together with any of the per-module options. All of these options are disabled by default. Only superusers can change these settings.

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