SFDCWallah

Custom Settings

• Deploy object, but no data
• Simple data types
• Kept in-memory during execution context
• 300 field limit
• Subject to total data limit
• Globally accessible
• Public/Protected Visibility in Managed Packages

Types of Custom Settings

• Hierarchy custom settings
  • Provides overrides: Organization, Profile, User
  • Accessible from formulas and workflows
• List custom settings
  • Provided to apex as a map

Custom Metadata

• Deployable objects and data(Including Managed Packages)
• Not editable via apex
• Doesn’t count towards query limits
• 10 MB org limit
• 100 field limit
• Public/Protected Visibility in Managed Packages
• Must query via SOQL
• Cached after first read
• Complex data types(including lookups)

Source: Salesforce Developers Youtube Channel