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Best Practices for Upgrading to Oracle Database 11g
Best Practices for Upgrading to Oracle Database 11g

... system; you cannot go to a new hardware platform. The other is that it is not re-runnable, so if you run into a problem during the upgrade, you would have to use the Manual Method from that point on. The Manual Method is useful for going to a new hardware platform with the same operating system. How ...
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SQL Server Enterprise Manager
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... Class Activity XYZ Corp. needs to deploy a large project with a Visual Basic front end and SQL Server 2000 back end. Polly, the DBA, wants to grant different types of permissions to different sets of users. For example, for the group that needs student details, she wants to give access only to the ...
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... concern of these database administrators (DBAs). Commercial databases have some forms of built-in security and auditing features that allow DBAs to audit their database systems. However, the auditing process can be complicated and is very time consuming, v ...
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... BOS91, IS93, Inc93] is limited to a pre-de ned taxonomy of simple xed-semantic schema evolution operations. However, such simple changes, typically to individual types only, are not sucient for many advanced applications [Bre96]. More radical changes of the schema, such as combining two types or ...
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... Data Definition Language (DDL) Allows the specification of not only a set of relations but also information about each relation, including: The schema for each relation. The domain of values associated with each attribute. Integrity constraints The set of indices to be maintained for each relations ...
< 1 ... 51 52 53 54 55 56 57 58 59 ... 492 >

Entity–attribute–value model

Entity–attribute–value model (EAV) is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. In mathematics, this model is known as a sparse matrix. EAV is also known as object–attribute–value model, vertical database model and open schema.
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