为了确保包含系统编目表的分区能够快速恢复，应避免将用户表也放在那个数据库分区上。
To ensure fast recovery of the partition containing system catalog tables, avoid placing user tables on the same database partition.
在创建一个数据库时，也会顺带创建一组编目表和视图。
A set of catalog tables and views is created whenever a database is created.
这条规则同样适用于全局变量的定义——与全局变量相关的权限也在系统编目中进行了定义。
This rule also applies to their definition — privileges associated with a global variable are also defined within the system catalog.
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