Posts about practice
Read a query plan in 10 minutes
EXPLAIN output looks like noise until you know the four things to look for. Open the SQL Lab, run one slow query from Mangrove's orders page, and learn to read the plan, fix it, and prove the fix.
The practice labs are open: what's free and what's in Plus
Six labs are live on the practice hub: SQL, Code, System Design Studio, Security, QA, and DevOps & TechOps. Here is what each one does, exactly what the free plan includes, what Plus adds, and what is still coming.
Find your system's limit before your users do
A design that works at today's traffic tells you little about next month's. In 15 minutes in the System Design Studio, you can find where a design breaks, what breaks first, and what one more user costs.