当定义一个主键约束时，联邦系统自动创建一个惟一的索引规范。
When a primary key constraint is defined, the federated system automatically creates a unique index specification.
考虑对所有小于52kb的表进行自动表重组，在线执行所有索引重组，并在重组时使用系统临时表空间。
Consider all tables for automatic table reorganization that are smaller than 52kb, perform all index reorganizations online, and use a system temporary table space when doing reorganization.
默认情况下，索引系统是活动的，并自动创建两个目录。
By default, the indexing system is active, and two catalogs are automatically created.
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