have two strings to one bow
有两手准备
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You'd better have two strings to your bow, just in case of emergency.
你最好有两手准备， 以防万一。
结合那些技术，并谨慎使用额外索引是有两手准备的性能调优方案，最有可能实现您的目标的。
Combining those techniques with judicious use of additional indexes is the two-pronged performance-tuning approach that is most likely to get you where you want to go.
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