Couchbase按索引排序非常慢

Question

我在s1_date中创建了一个索引，但是此查询仍然很慢（15 s），但是当我删除“由s1_date desc排序”时，它的速度更快（大约10毫秒），这是查询 ：

          SELECT * FROM `bucket_1` WHERE  type = 'type1' AND (batch_number1 like '' OR batch_number2 like '' OR  batch_number2 like '' OR batch_number3 like '' OR batch_number4 like '' OR batch_number5 like '') order by s1_date desc limit 10

Answer 1

这是查询的噩梦。 s1_date上的索引将无济于事，因为查询引擎必须应用谓词type = 'type1' AND (batch_number1 like '' OR batch_number2 like '' OR batch_number2 like '' OR batch_number3 like '' OR batch_number4 like '' OR batch_number5 like '')在进行任何排序之前，请先将type = 'type1' AND (batch_number1 like '' OR batch_number2 like '' OR batch_number2 like '' OR batch_number3 like '' OR batch_number4 like '' OR batch_number5 like '') ，这将是谓词的主要工作。 特别是那些OR确实使索引混乱，这意味着要快速运行查询将是一个问题。

看看是否可以用其他方式表示数据，这样就不必使用这些OR。