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In a master-detail relationship, if I am deleting the parent record,lets assume half of its child records were deleted after which I was getting some exception and the remaining child records were not deleted. So in this case, whether the child records which were deleted will it be rolled-back?

  • Deleting the master will delete all of it's children automatically by the platform. What do you mean half deletion? – Xi Xiao Nov 14 '18 at 8:54
  • Like if half of the child records were deleted and then if any exception occurs, what will happen to those deleted records? – Sindhuja Nov 14 '18 at 9:09
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It depends how you are performing the delete operation.

  • If you are deleting records with delete <list of child records> and if any errors occurs then no records will get deleted. Basically, it is treated as all or none

  • If you are deleting with Database.delete(<list of child records>, false) where false allows partial deletion then those records will not get rollback which are not throwing as errors.

  • If you are deleting with Database.delete(<list of child records>, true) and if any error occurs then all will be rolled back.

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Presuming that you're using the cascade deletion feature, all records will be deleted without validation or triggers. The only way it can fail is a master record has about 50,000 children, and this will be an automatic roll back. In a more general sense, Salesforce automatically rolls back a transaction if any record therein fails to insert/update/delete/undelete. Obviously, in cases of developers writing code, they can override this behavior, but the default behavior is to automatically roll back in the case of an exception.

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