The OAT provides the much needed information required by the DBA like the disk space usage, log files, SQL statements occupying the most IO time, the slowest SQL statements, and so on.

OAT提供DBA所需的大量信息，比如磁盘空间使用情况、日志文件、消耗IO时间最多的sql语句、最慢的sql语句等等。

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Closer inspection by NASA's Hubble Space Telescope reveals that these spots are actually a rare alignment of three of Jupiter's largest moons - IO, Ganymede, and Callisto - across the planet's face.

美国宇航局的哈勃太空望远镜近的距离观察发现，这些斑点实际上是横跨在木星表面上，很少见到的3个最大卫星(木卫1，木卫3，木卫4)的直线排列。

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Experimental results show that reducing query space can improve the indexing performance effectively and reduce the cost for IO and CPU.

实验结果表明，这种查询空间精练策略能够有效的提高索引的性能，降低相似性查询的IO代价和CPU代价。

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