# Statistics

> Complete dossiers for 14 core PostgreSQL settings in Statistics.
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Dossier URLs remain flat; this category exists only to organize browsing and the sidebar.

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Section pages:

- [compute_query_id](/parameters/compute-query-id/): compute_query_id — Enables in-core computation of query identifiers. Observed in PG14–19 Beta 3; its last measured boot default is auto in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [log_executor_stats](/parameters/log-executor-stats/): log_executor_stats — Writes executor performance statistics to the server log. Observed in PG9.0–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [log_parser_stats](/parameters/log-parser-stats/): log_parser_stats — Writes parser performance statistics to the server log. Observed in PG9.0–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [log_planner_stats](/parameters/log-planner-stats/): log_planner_stats — Writes planner performance statistics to the server log. Observed in PG9.0–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [log_statement_stats](/parameters/log-statement-stats/): log_statement_stats — Writes cumulative performance statistics to the server log. Observed in PG9.0–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [stats_fetch_consistency](/parameters/stats-fetch-consistency/): stats_fetch_consistency — Sets the consistency of accesses to statistics data. Observed in PG15–19 Beta 3; its last measured boot default is cache in PG19 Beta 3, with user context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [stats_temp_directory](/parameters/stats-temp-directory/): stats_temp_directory — Writes temporary statistics files to the specified directory. Observed in PG9.0–14; its last measured boot default is pg_stat_tmp in PG14, with sighup context. It was removed in PG15.
- [track_activities](/parameters/track-activities/): track_activities — Collects information about executing commands. Observed in PG9.0–19 Beta 3; its last measured boot default is on in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_activity_query_size](/parameters/track-activity-query-size/): track_activity_query_size — Sets the size reserved for pg_stat_activity.query, in bytes. Observed in PG9.0–19 Beta 3; its last measured boot default is 1 KiB in PG19 Beta 3, with postmaster context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_cost_delay_timing](/parameters/track-cost-delay-timing/): track_cost_delay_timing — Collects timing statistics for cost-based vacuum delay. Observed in PG18–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_counts](/parameters/track-counts/): track_counts — Collects statistics on database activity. Observed in PG9.0–19 Beta 3; its last measured boot default is on in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_functions](/parameters/track-functions/): track_functions — Collects function-level statistics on database activity. Observed in PG9.0–19 Beta 3; its last measured boot default is none in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_io_timing](/parameters/track-io-timing/): track_io_timing — Collects timing statistics for database I/O activity. Observed in PG9.2–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.
- [track_wal_io_timing](/parameters/track-wal-io-timing/): track_wal_io_timing — Collects timing statistics for WAL I/O activity. Observed in PG14–19 Beta 3; its last measured boot default is off in PG19 Beta 3, with superuser context. This is a beta-snapshot fact and can change before PostgreSQL 19 GA.