Google Cloud Spanner Query Planner Visualizer

build your own query planner

An eBPF based query planning tracer for PostgreSQL

Run the PostgreSQL Explain Visualizer 2 (pev2) from the command line.

Context Runtime — a database query planner for LLM context. Decides what a model sees before it answers; plans it, runs it through reused substrate, and learns from the outcome.

A tiny relational database written in Go

A minimal educational relational database management system (RDBMS) implemented in Java 17. The project demonstrates a custom SQL processing pipeline, including lexer, parser, semantic analysis, query planning, optimization, and execution. It features a storage engine with heap pages, a buffer pool, and supports indexing using B-trees and Hash

From-scratch database systems lab with SQL parser, slotted pages, WAL recovery, direct paged B+Tree index reads, query planner, and guided Workbench UI.

Rogue planets are starless planets, scientifically adrift in the cosmic dark alone

Hypothetical IVFFlat indexes for pgvector: test planner choices in EXPLAIN without building a physical index

Show all plans considered by the optimizer

Lint Postgres EXPLAIN ANALYZE plans for slow-query anti-patterns: seq scans on filtered big tables, hash joins spilling to disk, nested loops on too many outer rows, sort spilling, planner row-estimate skew. Reads JSON or text plans.

PostgreSQL의 최적의 비용 상수를 계산하는 AI 모델의 시연용 웹

Analyze PostgreSQL queries, visualize execution plans, and improve performance.

MiniDB: A compact relational database engine with a SQL shell, persistent storage, indexes, transactions, and WAL support.

openCypher front-end in Rust. Lex · parse · sema · plan · optimize · cost. Ships an MCP server (cypher-mcp). Storage-agnostic. v0.10 shipped.

🦆 Accelerate analytics with DuckDB's integration for GitHub workflows, enabling efficient data handling and processing directly within your repositories.