outline	2 3
title	PostgreSQL Stats
titleTemplate	NpgsqlRest
description	Configure PostgreSQL statistics endpoints for NpgsqlRest. Monitor routine performance, table statistics, index usage, and active database sessions.
head	meta name content keywords npgsqlrest stats, postgresql statistics, pg_stat_user_functions, pg_stat_user_tables, pg_stat_activity, database monitoring meta property content og:title NpgsqlRest PostgreSQL Stats Configuration meta property content og:description Configure PostgreSQL statistics endpoints for monitoring and debugging. meta property content og:type article

PostgreSQL Stats

::: tip New in 3.6.0 PostgreSQL Stats endpoints were added in version 3.6.0. :::

Exposes PostgreSQL statistics through HTTP endpoints for monitoring and debugging. Provides access to pg_stat_user_functions, pg_stat_user_tables, pg_stat_user_indexes, and pg_stat_activity.

Overview

{
  "Stats": {
    "Enabled": false,
    "CacheDuration": "5 seconds",
    "RateLimiterPolicy": null,
    "ConnectionName": null,
    "RequireAuthorization": false,
    "AuthorizedRoles": [],
    "OutputFormat": "html",
    "SchemaSimilarTo": null,
    "RoutinesStatsPath": "/stats/routines",
    "TablesStatsPath": "/stats/tables",
    "IndexesStatsPath": "/stats/indexes",
    "ActivityPath": "/stats/activity"
  }
}

Settings Reference

Setting	Type	Default	Description
Enabled	bool	false	Enable PostgreSQL statistics endpoints.
CacheDuration	string	"5 seconds"	Cache stats responses for the specified duration. PostgreSQL interval format. Set to null to disable caching.
RateLimiterPolicy	string	null	Apply a rate limiter policy to stats endpoints. Specify a policy name from RateLimiterOptions.Policies.
ConnectionName	string	null	Use a specific named connection for stats queries. When null, uses the default connection.
RequireAuthorization	bool	false	Require authentication for stats endpoints.
AuthorizedRoles	array	[]	Restrict access to specific roles. Empty array allows any authenticated user (if RequireAuthorization is true).
OutputFormat	string	"html"	Output format: "json" or "html". HTML format is Excel-compatible for easy copy-paste. Can be overridden per-request with the ?format= query string parameter.
SchemaSimilarTo	string	null	Filter schemas using PostgreSQL SIMILAR TO pattern.
RoutinesStatsPath	string	"/stats/routines"	Path for routine (function/procedure) statistics.
TablesStatsPath	string	"/stats/tables"	Path for table statistics.
IndexesStatsPath	string	"/stats/indexes"	Path for index statistics.
ActivityPath	string	"/stats/activity"	Path for current database activity.

Available Endpoints

Routines Stats (/stats/routines)

Returns data from pg_stat_user_functions including:

• Call counts
• Total execution time
• Self execution time

::: warning PostgreSQL Configuration Required Routine statistics require track_functions to be enabled in PostgreSQL:

ALTER SYSTEM SET track_functions = 'all';
SELECT pg_reload_conf();

Or set track_functions = 'all' in postgresql.conf and restart/reload. :::

Tables Stats (/stats/tables)

Returns data from pg_stat_user_tables including:

• Tuple counts (live, dead, inserted, updated, deleted)
• Table sizes
• Sequential and index scan counts
• Last vacuum and analyze timestamps

Indexes Stats (/stats/indexes)

Returns data from pg_stat_user_indexes including:

• Index scan counts
• Tuples read and fetched
• Index definitions
• Index sizes

Activity (/stats/activity)

Returns data from pg_stat_activity showing:

• Active sessions
• Currently running queries
• Wait events
• Session state and duration

::: danger Security Warning The activity endpoint shows currently running queries which may contain sensitive data (passwords in plaintext queries, personal information, etc.). Always enable RequireAuthorization in production. :::

Output Formats

HTML Format (Default)

{
  "Stats": {
    "Enabled": true,
    "OutputFormat": "html"
  }
}

Returns an HTML table that is Excel-compatible for direct browser copy-paste. Ideal for quick debugging and analysis.

JSON Format

{
  "Stats": {
    "Enabled": true,
    "OutputFormat": "json"
  }
}

Returns a JSON array suitable for programmatic access and integration with monitoring tools.

Per-Request Format Override

::: tip New in 3.8.0 The format query string override was added in version 3.8.0. :::

The configured OutputFormat can be overridden per-request using the format query string parameter. Valid values are html and json:

GET /stats/routines?format=json
GET /stats/tables?format=html

This allows a single stats deployment to serve both human-readable HTML and machine-readable JSON without changing the server configuration.

Security

Require Authentication

{
  "Stats": {
    "Enabled": true,
    "RequireAuthorization": true
  }
}

Any authenticated user can access stats endpoints.

Role-Based Access

{
  "Stats": {
    "Enabled": true,
    "RequireAuthorization": true,
    "AuthorizedRoles": ["admin", "dba"]
  }
}

Only users with admin or dba roles can access stats endpoints.

::: tip Stats endpoints can reveal sensitive information about your database including table sizes, query patterns, and active sessions. Always enable RequireAuthorization in production environments. :::

Caching

Cache responses to reduce database load:

{
  "Stats": {
    "Enabled": true,
    "CacheDuration": "10 seconds"
  }
}

The value uses PostgreSQL interval format:

• "5 seconds" or "5s"
• "1 minute" or "1min"
• "30s"

Set to null to disable caching (queries the database on every request).

Query strings are ignored to prevent cache-busting.

Rate Limiting

Apply a rate limiter policy to prevent abuse:

{
  "RateLimiterOptions": {
    "Enabled": true,
    "Policies": {
      "stats-limit": {
        "PermitLimit": 10,
        "Window": "1 minute"
      }
    }
  },
  "Stats": {
    "Enabled": true,
    "RateLimiterPolicy": "stats-limit"
  }
}

Schema Filtering

Filter statistics by schema using PostgreSQL SIMILAR TO pattern:

{
  "Stats": {
    "Enabled": true,
    "SchemaSimilarTo": "public|myapp%"
  }
}

This example includes:

• The public schema
• Schemas starting with myapp (e.g., myapp, myapp_v1, myapp_archive)

When null, all schemas are included.

Using a Different Connection

Query stats from a specific database or with different credentials:

{
  "ConnectionStrings": {
    "Default": "Host=primary;Database=myapp;Username=app;...",
    "Stats": "Host=replica;Database=myapp;Username=readonly;..."
  },
  "Stats": {
    "Enabled": true,
    "ConnectionName": "Stats"
  }
}

Useful for:

• Using read-only credentials
• Querying a read replica
• Separating stats queries from application traffic

Custom Paths

{
  "Stats": {
    "Enabled": true,
    "RoutinesStatsPath": "/api/stats/functions",
    "TablesStatsPath": "/api/stats/tables",
    "IndexesStatsPath": "/api/stats/indexes",
    "ActivityPath": "/api/stats/sessions"
  }
}

Example Configurations

Development (Open Access)

{
  "Stats": {
    "Enabled": true,
    "OutputFormat": "html"
  }
}

Production (Secured)

{
  "Stats": {
    "Enabled": true,
    "RequireAuthorization": true,
    "AuthorizedRoles": ["admin"],
    "CacheDuration": "30 seconds",
    "OutputFormat": "json"
  }
}

Monitoring Integration

{
  "Stats": {
    "Enabled": true,
    "RequireAuthorization": true,
    "AuthorizedRoles": ["monitoring"],
    "OutputFormat": "json",
    "CacheDuration": "10 seconds",
    "RateLimiterPolicy": "monitoring"
  }
}

Limited Schema Access

{
  "Stats": {
    "Enabled": true,
    "RequireAuthorization": true,
    "SchemaSimilarTo": "public|api%",
    "OutputFormat": "html"
  }
}

Related

• Rate Limiter - Configure rate limiting policies
• Authentication - Configure authentication for secured access
• Health Checks - Health check endpoints

Next Steps

• Logging - Configure logging for monitoring
• Connection - Database connection settings