您可以使用这些系统健康数据视图来诊断和修复性能问题。
You can use these system health data views to diagnose and tune performance problems.
与手动查询数据相比，使用视图具有明显的性能优势。
Using views gives you clear performance gains over querying the data manually.
将查询表与物化视图结合使用会带来很好的性能，但是它们使用本机数据库联接来检索相关记录。
Query tables in conjunction with materialized views perform well, but they use native database joins to retrieve the related records.
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