Postgres insights made easy
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README.md

PgHero

Postgres insights made easy

View the demo

Screenshot

Supports PostgreSQL 9.2+

💬 Get handcrafted updates for new features

For pure SQL, check out PgHero.sql and for a standalone app, check out PgHero Solo

A big thanks to Craig Kerstiens and Heroku for the initial queries 👏

Installation

Add this line to your application’s Gemfile:

gem 'pghero'

And mount the dashboard in your config/routes.rb:

mount PgHero::Engine, at: "pghero"

Be sure to secure the dashboard in production.

Insights

PgHero.running_queries
PgHero.long_running_queries
PgHero.index_usage
PgHero.missing_indexes
PgHero.unused_indexes
PgHero.unused_tables
PgHero.database_size
PgHero.relation_sizes
PgHero.index_hit_rate
PgHero.table_hit_rate

Kill queries

PgHero.kill(pid)
PgHero.kill_all

Query stats

PgHero.query_stats_enabled?
PgHero.enable_query_stats
PgHero.disable_query_stats
PgHero.reset_query_stats
PgHero.query_stats
PgHero.slow_queries

Users

Create a user

PgHero.create_user("link")
# {password: "zbTrNHk2tvMgNabFgCo0ws7T"}

This generates and returns a secure password. The user has full access to the public schema.

Read-only access

PgHero.create_user("epona", readonly: true)

Set the password

PgHero.create_user("zelda", password: "hyrule")

Drop a user

PgHero.drop_user("ganondorf")

Security

Basic Authentication

Set the following variables in your environment or an initializer.

ENV["PGHERO_USERNAME"] = "andrew"
ENV["PGHERO_PASSWORD"] = "secret"

Devise

authenticate :user, lambda {|user| user.admin? } do
  mount PgHero::Engine, at: "pghero"
end

Query Stats

The pg_stat_statements module is used for query stats.

Common Issues

Installation

If you have trouble enabling query stats from the dashboard, try doing it manually.

Add the following to your postgresql.conf:

shared_preload_libraries = 'pg_stat_statements'
pg_stat_statements.track = all

Then restart PostgreSQL. As a superuser from the psql console, run:

CREATE extension pg_stat_statements;

Note: Query stats are not available on Amazon RDS. Tell Amazon you want this.

pg_stat_statements must be loaded via shared_preload_libraries

Follow the instructions above.

FATAL: could not access file "pg_stat_statements": No such file or directory

Run apt-get install postgresql-contrib-9.3 and follow the instructions above.

The database user does not have permission to ...

The database user is not a superuser. You can manually enable stats from the psql console with:

CREATE extension pg_stat_statements;

and reset stats with:

SELECT pg_stat_statements_reset();

System Stats

CPU usage is available for Amazon RDS. Add these lines to your application’s Gemfile:

gem 'aws-sdk'
gem 'chartkick'

And add these variables to your environment:

PGHERO_ACCESS_KEY_ID=accesskey123
PGHERO_SECRET_ACCESS_KEY=secret123
PGHERO_DB_INSTANCE_IDENTIFIER=datakick-production

TODO

  • show exactly which indexes to add
  • more detailed explanations on dashboard

Know a bit about PostgreSQL? Suggestions are greatly appreciated.

Thanks

Thanks to Craig Kerstiens and Heroku for the initial queries and Bootswatch for the theme.

History

View the changelog

Contributing

Everyone is encouraged to help improve this project. Here are a few ways you can help: