您还研究了参数标记/主变量的使用会为 DB2 优化器对分布统计信息的考虑带来怎样的限制。

You have also examined how the use of parameter markers/host variables may limit the consideration of distribution statistics by the DB2 optimizer.

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一个参数标记或一个主变量。

A parameter marker or host variable.

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接下来，打开主mxml Application标记(mx： Application)，传入定义应用程序的大小和布局的属性，比如width、height和alignment。

Next, open your main MXML application tag (mx: application), passing in properties such as width, height, and alignment to define the size and layout of your application.

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