在有些情况下，保留该集合将是比较恰当的；而在其他情况下，使用方法将提供更大的好处，例如性能的提高和复杂性的减小。
In some cases, keeping the collection will be the right approach in other cases using methods will provide great benefits such as improved performance and reduced complexity.
只要不手动删除这些数据，它们就会永远保留在性能数据库中。
Data remains in the performance database forever unless you delete it manually.
此选项使您能够将已完成的流程实例暂时保留在数据库中，然后在以后系统不太慢的时候再删除它们，从而改进了性能。
This option improves performance by enabling you to temporarily leave completed process instances in the database, and then delete them at a later time when the system is less busy.
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