What's wrong with this SQL IN list with thousands of IDs?
What's wrong with this SQL IN list with thousands of IDs. The SQL code passes a huge IN clause. In MySQL large IN lists can crash the parser or pick a bad plan. In SQL use a temp table and JOIN instead.
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Why does this SQL lock table block readers?
Why does this SQL lock table block readers in production. The SQL code runs a long update in a transaction, holding locks and blocking reads. In SQL services this causes latency spikes and timeouts.
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