Working with access definitions

Use access definitions to specify the tables, relationship traversal, and selection criteria for the data you want to process.

An access definition includes the following items.

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 easily include the names of all tables related to the start table (to a maximum of 24,000 tables).
Start table
The start table is the first table to use when extracting data. You can specify any table in the access definition as the start table, except a reference table. If you do not explicitly specify a start table, the first table in the table list is the start table.
Related table
A related table is included based on a relationship to another table in the access definition.
Reference table
A table from which all rows are selected, unless selection criteria are specified. Specify any table as a reference table, except the start table.
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. Relationships among tables referenced by the access definition are listed on the relationship tab (to a maximum of 24,000 tables). You can select relationships to be used in processing and the direction in which they are traversed.
Selection criteria
Selection criteria define a specific set of data to use from the tables in an access definition. You can specify SQL operators and values, and use substitution variables with default values.
Point and shoot
Use a point and shoot list to select specific rows from a start table that will be included in a service.
Variables
Variables are user-defined default values specified in an access definition. You can use these substitution variables to specify column selection criteria or to create an SQL WHERE clause.
Additional parameters
Use additional parameters for extracting rows that correspond to a particular column value in the start table or for using a specified sampling rate (every nth row).

Naming conventions

A fully qualified access definition name is in the form identifier.name, where:

identifier
Qualifier assigned to the access definition (1 to 8 characters).
name
Base name assigned to the access definition (1 to 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.



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