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

Show all plans considered by the optimizer

PostgreSQL의 최적의 비용 상수를 계산하는 AI 모델의 시연용 웹

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

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.

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.

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