To ensure fast recovery of the partition containing system catalog tables, avoid placing user tables on the same database partition.
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。
Regular dbspaces: Regular dbspaces hold database objects like system catalog tables, user tables, and indices.
常规dbspace：常规dbspace用来存放数据库对象，如系统目录表、用户表和索引。
The mysql system database includes several grant tables that contain information about user accounts and the privileges held by them.
mysql系统数据库包括几个授权表，其中包含有关用户帐户及其拥有的权限的信息。
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