unit 4...photocopiable © oxford university press new treetops 3 anome potenziamento unit 4 1 a: can...

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Unit - IV Application Structure Structure of DBMS: DBMS (Database Management System) acts as an interface between the user and the database. The user requests the DBMS to perform various operations such as insert, delete, update and retrieval on the database. The components of DBMS perform these requested operations on the database and provide necessary data to the users . Applications: - It can be considered as a user friendly web page where the user enters the requests. Here he simply enters the details that he needs and presses buttons to get the data. End User: - They are the real users of the database. They can be developers, designers, administrator or the actual users of the database. DDL: - Data Definition Language (DDL) is a query fired to create database, schema, tables, mappings etc in the database. These are the commands used to create the objects like tables, indexes in the database for the first time. In other words, they create structure of the database. DDL Compiler: - This part of database is responsible for processing the DDL commands. That means these compiler actually breaks down the command into machine understandable codes. It is also responsible for storing the metadata information like table name, space used by it, number of columns in it, mapping information etc.

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Page 1: Unit 4...Photocopiable © Oxford University Press New Treetops 3 anome Potenziamento Unit 4 1 A: Can I have a doll, please? 1 B: Yes, here you are. 2 A: How much is it? 3 B

Photocopiable © Oxford University Press New Treetops 3a

nome

Potenziamento

Unit 4

1 A: Can I have a doll, please? 1 B: Yes, here you are. 2 A: How much is it? 3 B: It’s eighty cents. 4

2 B: Yes, you are. A: a lollipop, please? 1 A: much is it? B: It’s cents.

3 B: , here you are. A: How is it? A: Can I have a key ring, ? B: It’s cents.

4 A: Can I have a comic, please? A: is it? B: . B: Yes, here .

2 Scrivi. Poi numera le frasi.

1 1 Scrivi e abbina.

1 p u zzl e 2 l ll p p

4 c r 5 k y r ng

3 p stc rd

50c

80c

20c

30c