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Q&A
Q&ACount repeated statements per request, then batch-load without changing result cardinality.
Trace or log normalized SQL for one request and look for the same child lookup repeated once per parent row. Replace the loop with an eager/batch load or a query at the correct grain. Verify query count and returned rows; a broad join can fix round trips while accidentally multiplying results.
Q&A
Q&AIndependent hot fields on one cache line can cause cores to invalidate each other’s cache copies.
False sharing occurs when separate variables frequently written by different cores share a hardware cache line. The values are logically independent, but cache-coherence traffic makes updates contend. Confirm with profiling and workload measurements before padding or using specialized structures; layout optimizations are hardware- and JVM-sensitive.
databases
10 minChoose between distinct salary ranking, row ranking, and pagination syntax while handling ties and NULLs explicitly.
python
8 minFastAPI is fast, but speed is not the same as correctness. Learn where async, background jobs, and bounded concurrency matter in Python services.
Q&A
Q&AFunctions typically return values; procedures are invoked as operations, with engine-specific transaction rules.
A function is commonly used as an expression or query result and returns a value or table. A procedure is invoked to perform an operation and may accept output parameters. Triggers run implicitly. Transaction control differs by engine, so keep commit ownership explicit and test routines against the target database/version.