SQL Explain Visualizer

Paste your EXPLAIN output to visualize the execution plan. Identify performance bottlenecks and optimize your PostgreSQL, MySQL, and SQLite queries.

Analyze QueryView Examples
EXPLAIN Output
Run: EXPLAIN (ANALYZE, COSTS, VERBOSE, BUFFERS, FORMAT TEXT) your_query;
Enter SQL EXPLAIN output to visualizeSupports PostgreSQL EXPLAIN ANALYZE, MySQL EXPLAIN, and SQLite EXPLAIN QUERY PLAN formats

Common Execution Patterns

Click on an example to see how different SQL operations are visualized.

postgresql

PostgreSQL Sequential Scan

Understand how a Sequential Scan works in PostgreSQL and when to optimize it.
postgresql

PostgreSQL Index Scan

Visualize a standard Index Scan in PostgreSQL execution plans.
mysql

MySQL Simple Select

A basic MySQL execution plan showing a simple table lookup.
mysql

MySQL Filesort

Understanding the "Using filesort" operation in MySQL queries.
sqlite

SQLite Scan Table

Full table scan in SQLite.
sqlite

SQLite Search Index

Index lookup in SQLite.
View All Presets

Understanding Query Plans

Tree Structure

Query plans are trees. Each node represents an operation (scan, join, sort). The data flows from the leaves up to the root.

Cost Estimates

The database estimates the "cost" of each step. High costs relative to others often indicate optimization opportunities.

Access Methods

See if your query uses an Index Scan (fast) or a Sequential/Table Scan (slow for large tables).

Frequently Asked Questions

What is a SQL EXPLAIN plan?

A SQL EXPLAIN plan shows how the database engine intends to execute a query. It reveals whether indexes are used, how tables are joined, and estimates the cost of operations.

How do I optimize a slow query?

Look for full table scans (Seq Scan) on large tables, high-cost nodes, and expensive sort operations. Adding indexes or rewriting the query to avoid complex joins can often improve performance.
SQL Explain Visualizer - Analyze Query Performance | CoderPulse