A Schema Map in ServiceNow provides a visual representation of a table's relationships, including its extensions, references, and dependencies. This is useful for administrators and developers to understand how data is structured within an instance.
How to Access the Schema Map for a Table:
Navigate to System Definition > Tables
Select the desired table (e.g., incident, task, cmdb_ci, etc.)
Scroll to the "Related Links" section at the bottom of the form
Click "Show Schema Map"
This will open a graphical representation of the table, showing:
✅ Tables that extend from the selected table
✅ Tables that reference the selected table
✅ Fields that establish relationships
Why Other Options Are Incorrect?
A . System Dictionary > Show Schema Map; Select Table
The Schema Map is not accessed via the System Dictionary.
C . System Definition > Show Schema Map; Select Table
There is no direct "Show Schema Map" menu under System Definition; you must go through Tables first.
D . System Definition > Dictionary: Select Table; Go to Related Links and click Show Schema Map The Dictionary module does not provide a Schema Map option directly for tables.
Official ServiceNow Documentation Reference:
Schema Maps Overview
Viewing Table Relationships with Schema Map