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What does "if it does" refer to?


Now, in the interest of reducing resource contention ..., real-world systems typically do allow the construction of transactions that are not two-phase.... However, it should be clear that such transactions are a risky proposition; at best, allowing a given transaction A not to be two-phase amounts to a gamble that no interfering transaction B will ever coexist in the system with A (for if it does, then the system overall has the potential to produce wrong answers)
Introduction to Database Systems, J. Date

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Now, in the interest of reducing resource contention ..., real-world systems typically do allow the construction of transactions that are not two-phase.... However, it should be clear that such transactions are a risky proposition; at best, allowing a given transaction A not to be two-phase amounts to a gamble that no interfering transaction B will ever coexist in the system with A (for if it does, then the system overall has the potential to produce wrong answers)
Introduction to Database Systems, J. Date

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Now, in the interest of reducing resource contention ..., real-world systems typically do allow the construction of transactions that are not two-phase.... However, it should be clear that such transactions are a risky proposition; at best, allowing a given transaction A not to be two-phase amounts to a gamble that no interfering transaction B will ever coexist in the system with A (for if any interfering transaction B coexists in the system with A, then the system overall has the potential to produce wrong answers)
Introduction to Database Systems, J. Date


CJ

Comments  
Tara2for if it does,

= because if any interfering transaction B coexists in the system with A,

CJ

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Many thanks CJ. Emotion: smile

Sorry but can you please that part of the text that "if it does" refers to?

Tara2can you please that part

OK. I will try to be as pleasing as possible to that part so that it is pleased.

CJ

Emotion: smile

Sorry I meant what part of the text that "if it does" refers to?

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 CalifJim's reply was promoted to an answer.

Many thanks CJ. Emotion: smile

I asked since I thought it should be "If it will" because of "will" in " no interfering transaction B will ever coexist in the system w"

But it's not "if it will" because of "if", right?

Yes. The presence of "if" influences the tense you can use.

CJ

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Many thanks!!!!