tools / sql-explain
SQL Explain
Explain query plans, indexes, joins, scans, sort steps, and likely SQL performance bottlenecks from pasted EXPLAIN output.
4 signals detected. Start with sequential scan.
Sequential scan
The database scans many rows instead of using a selective index.
Check WHERE predicates, cardinality, statistics, and candidate indexes.
Nested loop risk
Nested loops can explode with large row counts.
Compare estimated vs actual rows and consider indexes or join strategy changes.
Disk sort or expensive sort
Sorting spilled to disk or required expensive work.
Add indexes for sort keys or increase memory only after confirming query shape.
Slow execution time
Execution time is high enough to investigate.
Collect plan with buffers/analyze and compare with normal runtime.
Seq Scan on users cost=0.00..431.00 rows=21000
Nested Loop
Sort Method: external merge Disk: 2048kB
Execution Time: 5321.44 ms
DebugTools product
SQL Explain
SQL Explain is a focused DebugTools mini-product for developers. Explain query plans, indexes, joins, scans, sort steps, and likely SQL performance bottlenecks from pasted EXPLAIN output.
Use cases
- Inspect CI, Kubernetes, trace, SQL, JVM, and production incident signals.
- Move from noisy output to the next command or measurement to run.
- Create an investigation note that is easy for teammates to follow.
How it works
- Paste or load the snippet you want to inspect in SQL Explain.
- Run the tool in the browser and review the highlighted output.
- Copy, export, or turn the result into the next debugging step.
Privacy
- SQL Explain is local-first. The core workflow runs in your browser and does not require sending pasted content to DebugTools servers.
This tool history
Recent Sql Explain sessions
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