Sleep also plays a role in test performance, but in two unexpected ways.
睡眠对考试成绩也有影响，但是有两种意想不到的方式。
Test performance: Be sure to test the index performance with a test database.
测试性能：确保利用一个测试数据库来测试索引性能。
Test performance was equal in the Barcelona data set.
在巴塞罗那试验中测验值相同。
Test performance was equal in the Barcelona data set.
在巴塞罗那试验中测验值相同。
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