货物周转量比上年同期下降最多的是（)。A．铁路B．公路C．水运D．民航

A.There is no impact on performance

B.The overhead depends on the settings of the Performance Schema

C.There is an overhead for querying the Performance Schema but not for having it enabled

D.There is a constant overhead regardless of settings and workload

A．.database

B．.tables

C．.schema

D．.ls

A．FILE

B．SCHEMA

C．OWNER

D．TABLES

A. The table is accessible to all users.

B. Tables are created in the public schema.

C. Tables are created in your schema.

D. Tables are created in the DBA schema.

E. You must specify the schema when the table is created.

Note: requirement (a) includes 4 professional marks.

A central feature of the performance measurement system at TSC is the widespread use of league tables that display

each depot’s performance relative to one another.

Required:

(b) Evaluate the potential benefits and problems associated with the use of ‘league tables’ as a means of

measuring performance. (6 marks)

A. An error is generated.

B. You will have two identical tables in the HR schema with different names.

C. You create a table called employees in the HR schema based on you EMP table.

D. You create an alternative name for the employees table in the HR schema in your own schema.

A. You have too many tables.

B. Your tables are too long.

C. Your tables have difficult names.

D. You want to work on your own tables.

E. You want to use another schema‘s tables.

F. You have too many columns in your tables.