Learn ServiceNow Online with Visualpath - ServiceNow Course
                     Understanding the ServiceNow 
System Dictionary
An Overview of Data Definitions & Configuration in ServiceNow
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Introduction to System Dictionary
Title:
What is the System Dictionary?
Content:
 Core repository that defines the structure of all tables and fields in 
ServiceNow
 Stores metadata like field type, default values, and behaviors
• Acts as the "blueprint" for data models in the platform
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Why is it Important?
Title: 
Importance of the System Dictionary
Content:
 Central control over data structure
 Enhances data consistency across the platform
 Enables customization without impacting core data
• Supports low-code/no-code configuration
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Key Components
Title: 
Key Components of the System Dictionary
Content:
 Tables: Define types of records (e.g., Incident, Change)
 Fields (Columns): Data attributes (e.g., Priority, State)
 Attributes: Define behaviour (e.g., read-only, mandatory)
• Dictionary Entries: Each field’s definition and rules
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Title:
Dictionary Table vs. Dictionary Entries
Content:
Dictionary vs. Dictionary Entry
Term Description
Stores metadata about fields and 
Dictionary Table
tables
Individual row defining one field’s 
Dictionary Entry
details
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Where it’s used
Title: 
where is the System Dictionary Used?
Content:
 When creating or modifying tables/fields
 For setting field-level properties like:
oDefault values
o Read-only or mandatory
o Field labels and hints
• Impacting forms, lists, and workflows
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Customization Example
Title:
Real-World Use Case: Customizing a Field
Content:
Example:
 Changing the label of the Priority field in the 
Incident table
 Making a field mandatory on a form
• Hiding fields based on roles using attributes
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Best Practices
Title:
Best Practices for Using the System Dictionary
• Content:
• Use with caution – impacts data globally
• Document changes for audits
• Prefer configuration over customization
• Test in sub-prod before applying in production
• Use system properties where possible
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Summary & Q&A
Title:
Summary & Questions
Content:
 System Dictionary = central metadata repository
 No-code configuration for powerful data control
 Follow best practices to avoid data issues
Any questions?
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For More Information About 
ServiceNow
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Thank You
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