An Access Definition defines a set of related data to be
processed by Optim™.
Use an Access Definition to select a set of related
data that
- Archive copies to an Archive File
or restores to a database.
- Move or Compare copies to an Extract
File for processing.
- Edit displays for editing.
Note: Access Definitions can be stored in the Optim Directory and shared among users.
An Access Definition references tables,
prescribes relationship usage, and includes criteria and other parameters:
- Tables
- An Access Definition must reference at least one
table, view, alias, or synonym. The table, view, alias, or synonym
from which rows are selected first is called the Start Table. You
can enter the name of a Start Table and include the names of all tables
that are related to the Start Table in the Access Definition. You
can specify a maximum of 24,000 tables.
- Relationships
- Relationships determine the traversal path for
selecting data from tables. By default, relationships are traversed
from parent to child, but you can control the direction of traversal
using settings in the Access Definition. The Relationship tab lists
the relationships among tables that are referenced by the Access Definition.
You can select the tables that are used in processing and the direction
in which they are traversed.
- Table Specifications
- Table Specifications define the data and provide
special instructions for processes that use the Access Definition.
Table Specifications include the following information:
- Selection Criteria for focusing
on a specific set of related data. You can visually select rows (Point
and Shoot), specify SQL operators and values, and use substitution
variables with default values.
- Column and Sort options for displaying
data for Point and Shoot selection or for editing.
- Additional Parameters
- Additional parameters in an Access Definition include
the following information:
- Sampling parameters for extracting
rows that correspond to a particular column value in the Start Table,
or using a specified sampling rate (every nth row).
- Specifications for indexes that
enable quick access to data in Archive Files.
- Specifications for custom SQL statements
that can be executed at selected action phases of an Archive, Extract,
Delete, or Restore Process.
Naming Conventions
A
fully qualified Access Definition name is in the form identifier.name,
where:
- identifier
- Qualifier that is assigned to the Access Definition
(1 - 8 characters).
- name
- Base name that is assigned to the Access Definition
(1 - 12 characters).
A logical set of naming conventions
can identify the use for each Access Definition and be used to organize
them for easy access.
Contents
This
section explains how to create and maintain Access Definitions, including
how to
- Reference the tables that contain
the appropriate set of data.
- Select the relationships to be traversed
between each pair of tables.
- Define selection criteria to limit
the set of data.