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Add a "Sizing the maintenance window on PostgreSQL" sub-section to the operator runbook. The simple per-table COUNT/duplicate/NULL queries that were already there are dialect-portable but only count rows; operators on PostgreSQL with large deployments need to characterize the migration's runtime cost before scheduling it. Adds four diagnostic queries: - Per-table size, row count (from pg_class.reltuples), and which migration path each table will take (recreate-rewrite vs direct ALTER). Sizes the work concretely. - Aggregated duplicate-row roll-up: dup_groups + total rows_dropped per table. Replaces eight separate per-table queries with one consolidated result for audit/dump-before-apply decisions. - External-FK pre-flight check (the same one the migration runs at upgrade time and aborts on). Lets operators surface any blocking external reference ahead of the maintenance window. Should be empty on a stock install. - Lock-window estimate for the two full-rewrite tables, using pg_relation_size and a conservative 100 MB/s rewrite throughput assumption. The other six use direct ALTER and are dominated by composite-index build time (seconds for low-millions-of-rows tables). Prompted by reviewer feedback on apache/superset#39859 from a large deployment asking how to size the maintenance window. The original pre-flight queries are kept for cross-dialect operators (MySQL, SQLite) since the new queries use PostgreSQL-specific catalog views. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Superset
A modern, enterprise-ready business intelligence web application.
Documentation
- User Guide — For analysts and business users. Explore data, build charts, create dashboards, and connect databases.
- Administrator Guide — Install, configure, and operate Superset. Covers security, scaling, and database drivers.
- Developer Guide — Contribute to Superset or build on its REST API and extension framework.
Why Superset? | Supported Databases | Release Notes | Get Involved | Resources | Organizations Using Superset
Why Superset?
Superset is a modern data exploration and data visualization platform. Superset can replace or augment proprietary business intelligence tools for many teams. Superset integrates well with a variety of data sources.
Superset provides:
- A no-code interface for building charts quickly
- A powerful, web-based SQL Editor for advanced querying
- A lightweight semantic layer for quickly defining custom dimensions and metrics
- Out of the box support for nearly any SQL database or data engine
- A wide array of beautiful visualizations to showcase your data, ranging from simple bar charts to geospatial visualizations
- Lightweight, configurable caching layer to help ease database load
- Highly extensible security roles and authentication options
- An API for programmatic customization
- A cloud-native architecture designed from the ground up for scale
Screenshots & Gifs
Video Overview
Large Gallery of Visualizations
Craft Beautiful, Dynamic Dashboards
No-Code Chart Builder
Powerful SQL Editor
Supported Databases
Superset can query data from any SQL-speaking datastore or data engine (Presto, Trino, Athena, and more) that has a Python DB-API driver and a SQLAlchemy dialect.
Here are some of the major database solutions that are supported:
A more comprehensive list of supported databases along with the configuration instructions can be found here.
Want to add support for your datastore or data engine? Read more here about the technical requirements.
Installation and Configuration
Try out Superset's quickstart guide or learn about the options for production deployments.
Get Involved
- Ask and answer questions on StackOverflow using the apache-superset tag
- Join our community's Slack and please read our Slack Community Guidelines
- Join our dev@superset.apache.org Mailing list. To join, simply send an email to dev-subscribe@superset.apache.org
- If you want to help troubleshoot GitHub Issues involving the numerous database drivers that Superset supports, please consider adding your name and the databases you have access to on the Superset Database Familiarity Rolodex
- Join Superset's Town Hall and Operational Model recurring meetings. Meeting info is available on the Superset Community Calendar
Contributor Guide
Interested in contributing? Check out our Developer Guide to find resources around contributing along with a detailed guide on how to set up a development environment.
Resources
- Superset "In the Wild" - see who's using Superset, and add your organization to the list!
- Feature Flags - the status of Superset's Feature Flags.
- Standard Roles - How RBAC permissions map to roles.
- Superset Wiki - Tons of additional community resources: best practices, community content and other information.
- Superset SIPs - The status of Superset's SIPs (Superset Improvement Proposals) for both consensus and implementation status.
Understanding the Superset Points of View
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Getting Started with Superset
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Deploying Superset
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Recordings of Past Superset Community Events
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Visualizations
Repo Activity
