UPDATE 6m records quickly
I have several large tables, 5-6m records that I need to update from time with new calculated values. The SQL UPDATE does a select and then a write. This is very slow for 5m records even when the WHERE clause is a simple KEY and indexed.
Any suggestions on how I could do these large volume updates more efficiently?
Is there a way to sequentially write to tables or similar to avoid the SELECT?
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UPDATE 6m records quickly
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