Inside the function of a tie, more records outside of the final report of that tie, as specified in the Purchase BY clause, might be included in the result established.
What I think can make my Top rated system so poor would be that the rows staying picked from t1 and t2 are many of the latest rows (most significant values for t1.id and t2.id). The question optimiser has assumed that selecting the initial 5 rows from an evenly distributed typical resultset are going to be faster in comparison to the non-Major approach.
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Having said that, this clue is not sufficient to comprehend the row aim is applied to the question system via the optimizer. The EstimateRowsWithoutRowGoal attribute demonstrates the row goal is placed on the query approach operator and it defines the quantity of rows might be estimated In the event the row goal is not really utilized by the optimizer.
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You'll find other stackoverflow discussions on this similar subject matter (one-way links at base). As observed while in the responses earlier mentioned it may need one thing to accomplish with indexes and the optimizer receiving confused and utilizing the Erroneous just one.
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try out adding Established ROWCOUNT 10 right before your query. It served me sometimes. Bear in mind that this is the scope environment so You will need to established it back to its primary worth after jogging your query.