Question

I have two SQL queries with about 2-3 INNER JOINS each. I need to do an INTERSECT between them.

Problem is that indiividually the queryes work fast, but after intersecting take about 4 seconds in total.

Now, if I put an OPTION (RECOMPILE) at the end of this whole query, the query works great again working quite fast returning almost instantly!.

I understand that option recopile forces a rebuild of execution plan, so I am confused now if my earler query taking 4 seconds is better or now the one with recompile, but taking 0 seconds is better.

Answer 1

Rather than answer the question you asked, here’s what you should do:

Update your statistics:

EXEC sp_updatestats

If that doesn’t work, rebuild indexes.

If that doesn’t work, look at OPTIMIZE FOR