Why LIMIT Doesn’t Make SQL Fast (Production Reality)

LIMIT looks like a shortcut — but in production, it rarely saves you.
When a query is slow, many developers add LIMIT assuming fewer rows means less work.
But databases don’t work that way.
LIMIT is applied after rows are scanned, filtered, or sorted.
So even with LIMIT 10, the database may still scan large tables, consume memory, and burn CPU.
In real systems: • LIMIT controls output size
• It does NOT control execution cost
This episode explains why LIMIT doesn’t make queries fast — and why production performance depends on how rows are found, not how many are returned.
➡️ Next episode: So what really decides query order?
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Видео Why LIMIT Doesn’t Make SQL Fast (Production Reality) канала Technical V