In addition, each database has its own catalog tables and user tables.

此外，每一个数据库拥有自己的目录表和用户表。

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When there is any data modification to the user tables, the catalog statistics tables are not automatically modified.

当用户表中发生数据修改时，目录统计信息表不会自动被修改。

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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。

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It was Ed Krol's Whole Internet User's Guide and Catalog which O'Reilly published in 1992 just before Internet fever reached mass hysteria levels.

FORBES: Calliope's revenge

Online books didn't work out too well, but O'Reilly had the idea of putting Internet kiosks in bookstores as a way of promoting the Whole Internet User's Guide and Catalog.

FORBES: Calliope's revenge