ER/Studio - Embarcadero Technologies Product Documentation

USING ER/STUDIO > DEVELOPING THE PHYSICAL MODEL
Reference page/tab
Select the type of object you want to reference. If there are any objects in the model that match your selection,
you can click the identifier list to choose the appropriate identifier.
Definition page/tab
Enter or edit a definition for the alias. If the target database supports it, ER/Studio adds this definition as a
comment when generating SQL code. The maximum length of comments in the DDL is 254 characters.
DDL page/tab
Displays the CREATE ALIAS statement needed to build the alias. ER/Studio uses the platform-specific parser of
the model’s selected database platform to generate the alias.
Attachment Bindings tab
Bind an external piece of information, or attachment to the alias. You can also remove an attachment from an
object, override an attachment binding’s default value, or change the position of a bound attachment. To override
the value of the attachment you have moved to the Selected Attachments grid, double-click the Value field of the
target attachment. ER/Studio opens the Value Override Editor or a list depending on the attachment datatype.
Attachments are created in the Attachments folder of the Data Dictionary and must be applied to the alias before
they will display on this tab. For more information, see Attaching External Documents to the Data Model.
Creating and Editing Auxiliary Tables
Auxiliary Tables are created to store the data of large object (LOB) Columns. LOB Columns are columns in a regular
table, called the Base Table, whose data type is BLOB or CLOB and whose data is large objects. Since the data is
very large, it is not stored with the other data in the table. Even though the base table holds the LOB Column logically,
as a VARCHAR(4), the LOB Column’s data is physically stored in the auxiliary table. Each LOB Column has at least
one auxiliary table associated with it. Either one auxiliary table for each LOB Column of a non-partitioned table, or one
auxiliary table for each LOB Column for each partition, if the LOB Column is defined in a partitioned base table. For
example, if you have two LOB Columns in a Base Table with four partitions, you must also have a total of eight
auxiliary tables.
NOTE: You must store Auxiliary tables each in their own auxiliary tablespaces, and you must create a
unique index on them.
The following database platforms support auxiliary tables:
• IBM DB2 for OS/390 5.x and 6.x
• IBM DB2 for z/OS 7.x, 8.x, and 9.x
NOTE: The Auxiliary Table Wizard and Auxiliary Table Editor share the same options, except for
Attachment Bindings options which are present only in the editor.
Add an Auxiliary Table
1 In the Data Model Explorer, expand the Physical Main Model, right-click the Auxiliary Tables node, and then
select New Auxiliary Table.
2 Complete the Auxiliary Tables Wizard and then click Finish to create the auxiliary table.
TIP: Once you have created the auxiliary table, you can edit it by right-clicking the auxiliary table you
want to change, and then selecting Edit Auxiliary Table.
The following describe options that require additional explanation.
EMBARCADERO TECHNOLOGIES > ER/STUDIO® 8.0.3 USER GUIDE 176