Last updated 08-14-2026
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SQLFlash
SQLFlash rewrites slow queries, recommends indexes, and explains every change in plain language. You paste a statement or upload a MyBatis XML mapping, and it returns an optimized version with a diff viewer, query plan breakdown, and performance score. It supports MySQL, PostgreSQL, Oracle, SQL Server, MariaDB, TiDB, and other relational engines without needing database credentials.
Most SQL tuners either need live access to your database or hand you a rewritten query with no context. SQLFlash takes the opposite approach: it works on the text alone, uses a two-stage rule filter to match optimization patterns, and documents each rewrite step in a journal you can audit. That trade-off means you validate results in your own test environment, but you never grant read access to production data.
Developers, DBAs, and platform teams use SQLFlash when legacy queries slow down apps, when MyBatis XML files pile up without review, or when a database migration changes execution plans overnight. Case studies on the site cover e-commerce product pages, banking dashboards, restaurant order history, and school course progress queries.
Optimize any SQL statement in two steps with zero database configuration
Two-stage intelligent filter applies 31+ optimization rules across MySQL, PostgreSQL, Oracle, and SQL Server
Dual-pane SQL diff viewer with query plan explainer and optimization step journal
MyBatis XML auto-rewrite for teams running Java persistence layers
Starter plan covers 20 SQL queries and 10 XML files per month at $18.80
Free tier includes 1 SQL query and 1 XML file per month with no credit card
Works without database credentials or sensitive data sharing
Explainable rewrites with diff viewer and optimization journal
Supports 10+ relational database engines plus MyBatis XML
31 new optimization rules added in the latest release
Enterprise plan includes consulting with database experts
Free plan limits you to 1 SQL query and 1 XML file per month
ORM support beyond MyBatis is limited to community beta tools
DNS or connectivity issues can block live site access during outages
Does SQLFlash need access to my database?
No. SQLFlash analyzes the SQL text you submit and does not require database credentials or network access to your servers. You test optimized queries in your own environment before deploying them to production.
Which databases does SQLFlash support?
SQLFlash supports MySQL, PostgreSQL, Oracle, SQL Server, MariaDB, TiDB, and other mainstream relational databases. Optimization rules target syntax patterns common across these engines.
How much does SQLFlash cost?
SQLFlash offers a Free plan at $0 per month for 1 SQL query and 1 XML file. The Starter plan is $18.80 per month for 20 queries and 10 XML files. Enterprise is $450 per month for 100 queries and 25 XML files plus expert consulting.
Can SQLFlash optimize MyBatis XML files?
Yes. SQLFlash specializes in MyBatis XML mapping optimization and auto-rewrites inefficient statements inside those files. Hibernate and other ORM frameworks are not fully supported yet, though beta tools are discussed in the community.
Is there a free trial for SQLFlash?
Yes. SQLFlash provides a Free plan with monthly query limits and also offers a 30-day trial code (SQLFLASH-FREE30) for extended access to paid features listed on the product news page.
How does SQLFlash explain its optimizations?
SQLFlash shows a dual-pane SQL diff, an AI query plan explainer, an optimization step journal, and a cost-benefit analysis matrix for each rewrite. Every suggestion is tied to a named rule so engineers can verify the logic.