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数据库catalog的定义

时间: 2012-08-13   |   分类: db+nosql     |   阅读: 67 字 ~1分钟

The database catalog of a database instance consists ofmetadata in which definitions of database objects such as basetables, views (virtual tables), synonyms, value ranges, indexes,users, and user groups are stored.

The SQL standard specifies a uniform means to access thecatalog, called the INFORMATION_SCHEMA, but not all databasesfollow this, even if they implement other aspects of the SQLstandard. For an example of database-specific metadata accessmethods, see Oracle metadata.

标题:数据库catalog的定义
作者:mryqu
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