What sObject properties doesn't cause trigger to fire in salesforce?

Hi Mohit,

There are many operations like some system bulk operations don't invoke triggers:

• Cascading delete operations.
• Cascading updates of child records that are reparented as a result of a merge operation
• Changing a user's default division with the transfer division option checked
• Changes to the following objects:
  BrandTemplate
  MassEmailTemplate
  Folder
• Mass address updates
• Mass approval request transfers
• Mass campaign status changes
• Mass division transfers
• Mass email actions
• Managing price books
• Modifying custom field data types
• Renaming or replacing picklists
• Update account triggers don't fire before or after a business account record type is changed to person account (or a person account record type is changed to business account.)
• Inserts, updates, and deletes on person accounts fire Account triggers, not Contact triggers.
• Content pack operations involving the ContentVersion object, including slides and slide autorevision, don't invoke triggers.
• Triggers on the Attachment object don’t fire when:
  the attachment is created via Case Feed publisher.
  the user sends email via the Email related list and adds an attachment file.

Hope this helps you.

Thanks