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Asked: 2026-06-01T10:03:25+00:00

I have a quite complex multi-join TSQL SELECT query that runs for about 8

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I have a quite complex multi-join TSQL SELECT query that runs for about 8 seconds and returns about 300K records. Which is currently acceptable. But I need to reuse results of that query several times later, so I am inserting results of the query into a temp table. Table is created in advance with columns that match output of SELECT query. But as soon as I do INSERT INTO … SELECT – execution time more than doubles to over 20 seconds! Execution plans shows that 46% of the query cost goes to “Table Insert” and 38% to Table Spool (Eager Spool).

Any idea why this is happening and how to speed it up?

Thanks!

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1 Answer

  1. Editorial Team

    The “Why” of it hard to say, we’d need a lot more information. (though my SWAG would be that it has to do with logging…)

    However, the solution, 9 times out of 10 is to use SELECT INTO to make your temp table.

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