Using the dictionary

Bài viết sau sẽ giúp ta phân biệt được cách dùng giữa “neither” và “none”. - Neither có nghĩa là “not one or the other” (of two things). Theo từ điển The American Heritage Dictionary of the English language 4th edition, Usage Note, page 1177: “According to traditional rule, neither is used only to mean ‘not one or the other of the two’. To refer to ‘none of several,’ none is preferred.”

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E. Use the words and phrases in the box to complete the table. Use a good dictionary to help you. (Sử dụng các từ và cụm từ trong hộp để hoàn thành bảng dụng một từ điển tốt để giúp bạn)

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Users and Security Security domain The database administrator defines the names of the users who are allowed to access a database. A security domain defines the settings that apply to the user. Authentication mechanism A user who requires access to the database can be authenticated by one of the following: Data dictionary Operating system Network The means of authentication is specified at the time the user is defined in the database and can be altered later. This lesson covers authentication by database and by operating system only.

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Built-In Database Objects In addition to creating the database files, several other structures are created. Data dictionary: Contains descriptions of the objects in the database Dynamic performance tables: Contains information used by the database administrator (DBA) to monitor and tune the database and instance PL/SQL packages: Program units adding functionality to the database. These packages are created when the catproc.sql script is run after the CREATE DATABASE command. PL/SQL packages will not be discussed within the scope of this course.

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