ER/Studio - Embarcadero Technologies Product Documentation

USING ER/STUDIO > DEVELOPING THE PHYSICAL MODEL
• Maximum Locks: Set this to a low number to avoid contention. Setting LOCKMAX to zero increases tablespace
availability by preventing lock escalations which can lock the tablespace. Setting LOCKMAX to SYSTEM allows the
database manager to control the maximum number of locks by a setting in the database configuration file.
• Close Rule: Determines whether the data sets can be closed when the table space is not in use, and the limit on
the number of open data sets (DSMAX) is reached. If you select No, no data sets can be closed. However, if
DSMAX is reached and no CLOSE YES page sets exist, then even CLOSE NO page sets will be closed.
• Partitions: For information on partition parameters, see Partitioning a Table.
Definition page/tab
Enter or edit a definition for the tablespace. If the target database supports it, ER/Studio adds this definition as a
comment when generating SQL code.
DDL page/tab
Displays the CREATE TABLESPACE statement needed to build the tablespace. ER/Studio uses the
platform-specific parser of the model’s selected database platform to generate the tablespace.
Attachment Bindings page/ tab
Bind an external piece of information, or attachment to the tablespace. 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. For more information, see
Attaching External Documents to the Data Model.
Creating and Editing Database Schemas
A database schema is a collection of unique objects in a namespace. Schemas allow you to group tables and other
related objects together, such as a table and an index. Once the schema has been defined you can
The following database platforms support Schemas:
• IBM DB2 for LUW 5.x, 6.x, 7.x, 8.x, and 9.x
• Microsoft SQL Server 2005 and 2008
NOTE: The Database Schema Wizard and Database Schema Editor share the same options, except for
Attachment Bindings options which are present only in the editor.
Create a Database Schema
1 In the Data Model Explorer, expand the Physical Main Model, right-click the Schema node and then click New
Database Schema.
2 Complete the Database Schema Wizard and then click Finish to create the database schema.
TIP: Once you have created the schema, you can edit it by right-clicking the schema you want to
change, and then selecting Edit Schema.
The following describe options that require additional explanation:
Object Privilege page/tab
Sets access roles and user permissions for the schema. Keep in mind that the more specific permissions are,
the more time you may have to spend maintaining and updating them. The Roles and Users must be previously
assigned to appear in the Sequence Editor. For more information, see Granting and Revoking Permissions to
Modify Database Objects.
EMBARCADERO TECHNOLOGIES > ER/STUDIO® 8.0.3 USER GUIDE 209