而且，你可以使用用户自定义类来创建自己内容的索引和目录。

Moreover, you can also use custom categories to create your own indexes and catalogs on your content.

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示例5：收集表和索引上的目录统计信息，不包含分布统计信息。

Example 5: Collect catalog statistics on the table and indexes without distribution statistics.

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示例 9：收集表和索引上的目录统计信息，包含分布统计信息

Example 9: Collect catalog statistics on the table and indexes with distribution statistics

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