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Otimização de um UPDATE para gravar 5800 registros


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Rode a query com a cláusula EXPLAIN a frente dela.
exemplo EXPLAIN UPDATE.... ou EXPLAIN SELECT ...
O EXPLAIN não afetará os dados em sua base. Ele mostrará onde estão os gargalos de índices em sua query.

Verifique indices.


Em último caso, mostre a query para que possamos ajudá-lo melhor

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