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There is a master-detail relationship between two objects and I want to ensure that the master object should not have more than 10 child records. How can we achieve this without using a trigger ?

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Create Roll-up summary - COUNT field on Parent object and validation rule

If you’re trying to enforce a record limit of 25 on the parent roll-up summary field, create validation rules on your child objects. When you add a child record, your validation rule on the child object can check if the count is already 25 or greater.

https://help.salesforce.com/s/articleView?id=sf.fields_about_roll_up_summary_fields.htm&type=5

from documentation - Best Practices

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  • will this solution be always real-time? As mentioned here "Calculating roll-up summary field values can take up to 30 minutes, depending on the number of records affected and other factors".
    – Krishnan Mishra
    Commented May 29, 2022 at 12:36
  • I believe that is about sharing recalculation and owners, currency recalculation, .etc .
    – Pavlo M
    Commented May 30, 2022 at 7:34

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