更新数据库服务器用于优化查询的系统编目表。
Update system catalog tables that the database server USES to optimize queries.
数据库服务器不更新系统编目表中的统计信息。
The database server does not update the statistics in the system catalog tables.
对于每个数据库，都创建和维护一组系统编目表。
A set of system catalog tables is created and maintained for each database.
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