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Unit 3: Performance During Table Access
BC430
2.
Create the new index only on the MAXDB and SQL Server database systems.
a)
Select
For selected database systems
.
b)
Then choose the arrow symbol in this line. Choose
Selection list
. Using
the F4 help, select the identifiers for the database systems
ADA
for
Adabas and
MSS
for SQL Server from the list.
c)
Choose
Continue
.
d)
Activate the index.
98
© 2007 SAP AG. All rights reserved.
2006/Q2
BC430
Lesson: Performance During Table Access
Lesson Summary
You should now be able to:
•
Judge when table accesses can be speeded up by using indexes
•
Create indexes in the ABAP Dictionary
•
Explain the different buffering types
•
Judge when it makes sense to buffer a table and which buffering type you
should choose
•
Buffer a table using the technical settings
2006/Q2
© 2007 SAP AG. All rights reserved.
99
Unit Summary
BC430
Unit Summary
You should now be able to:
•
Judge when table accesses can be speeded up by using indexes
•
Create indexes in the ABAP Dictionary
•
Explain the different buffering types
•
Judge when it makes sense to buffer a table and which buffering type you
should choose
•
Buffer a table using the technical settings
100
© 2007 SAP AG. All rights reserved.
2006/Q2
Unit 4
Input Checks
Unit Overview
In this chapter, you will get to know the options for defining input checks in the
Dictionary.
Unit Objectives
After completing this unit, you will be able to:
•
Create and use fixed values
•
Define what a foreign key is
•
Apply the conditions for the field assignment of the foreign key
•
Know the difference between the value table and the check table
•
Create foreign key
Unit Contents
Lesson: Consistency Through Input Checks ................................102
Exercise 7: Consistency Through Input Checks ....................... 113
2006/Q2
© 2007 SAP AG. All rights reserved.
101
Unit 4: Input Checks
BC430
Lesson: Consistency Through Input Checks
Lesson Overview
Lesson Objectives
After completing this lesson, you will be able to:
•
Create and use fixed values
•
Define what a foreign key is
•
Apply the conditions for the field assignment of the foreign key
•
Know the difference between the value table and the check table
•
Create foreign key
Business Example
When entering values in your application, further checks on the screens should
already occur without additional ABAP coding.
Input check via the technical domains
Figure 44: Fixed values
The domain describes the value range of a field by specifying its data type and
field length. If only a limited set of values is allowed, these can be defined as
fixed values.
102
© 2007 SAP AG. All rights reserved.
2006/Q2