Essentially, cascade deletion is a by-product of Salesforce’s file structure, and particularly, the parent-child relationship between records. The result is that when you accidentally delete an account or record from Salesforce (which wouldn’t be unusual, with 64% of SaaS data loss resulting from human error), all its related items go with it.
Table of Contents
What is cascading delete in Salesforce?
Cascade Delete Feature Provides Lookup Relationships the same cascading delete functionality previously only available to Master Detail Relationships. This is automatically working on Standard Lookup Fields. However, Custom Lookup fields will have the option “Delete this record also.
What is Cascade delete and how to use it?
This is cascade delete. In a many-to-many relationship, a user can’t delete a parent record if there are more than 200 junction object records associated with it and if the junction object has a roll-up summary field that rolls up to the other parent. To delete this object, manually delete junction object records until the count is fewer than 200.
How to enable Cascade delete on custom lookup relationships in Salesforce?
Contact Salesforce Support to get the “Enables cascade delete on custom lookup relationships” feature enabled for your organization. Note: Cascade-delete and its related options are not available for lookup relationships to Business Hours, Community, Lead, Price Book, Product, or User objects.
What happens when data is deleted by accident in Salesforce?
However, when data is deleted by accident using this functionality, it can be very disruptive. If you’ve ever deleted an Account in Salesforce and noticed that all of the related Contacts and Opportunities have also been deleted, then you’ve experienced cascade delete at work.
What is cascade delete?
What happens when you delete parent in bulk?
What is Cascade delete used for?
Use the ON DELETE CASCADE option to specify whether you want rows deleted in a child table when corresponding rows are deleted in the parent table. If you do not specify cascading deletes, the default behavior of the database server prevents you from deleting data in a table if other tables reference it.
How do I set up Cascade delete in Salesforce?
Steps in Lightning :Click on Setup.Object Manager.Select the Object the custom lookup field is created.Open the Lookup Field.Select the Edit Button.Put a tick mark on the option : “Delete this record also. … Hit Save.
What is the function of on delete cascade on delete cascade?
1 Answer. The explanation is: It is used to preserve referential integrity in the relation. When an attribute of a relation is the foreign key in another relation, deleting it causes referential integrity problems. The on delete cascade solves this problem by forcing us to delete the foreign key first.
Should I use cascade delete?
ON DELETE CASCADE is fine, but only when the dependent rows are really a logical extension of the row being deleted. For example, it’s OK for DELETE ORDERS to delete the associated ORDER_LINES because clearly you want to delete this order, which consists of a header and some lines.
What is cascade relationship in Salesforce?
A cascade-delete bypasses security and sharing settings, which means users can delete records when the target lookup record is deleted even if they don’t have access to the records. To prevent records from being accidentally deleted, cascade-delete is disabled by default.
How do I prevent cascade delete in Salesforce?
To prevent records from being accidentally deleted, cascade-delete is disabled by default. Contact Salesforce Support to get the “Enables cascade delete on custom lookup relationships” feature enabled for your organization.
What is the difference between on delete set null and on delete cascade?
ON DELETE CASCADE : SQL Server deletes the rows in the child table that is corresponding to the row deleted from the parent table. ON DELETE SET NULL : SQL Server sets the rows in the child table to NULL if the corresponding rows in the parent table are deleted.
Can foreign key be null?
Foreign keys allow key values that are all NULL , even if there are no matching PRIMARY or UNIQUE keys.
What is on delete cascade and on update cascade?
1) ON DELETE CASCADE means if the parent record is deleted, then any referencing child records are also deleted. ON UPDATE defaults to RESTRICT, which means the UPDATE on the parent record will fail.
Why do we use Cascade?
CASCADE. It is used in conjunction with ON DELETE or ON UPDATE. It means that the child data is either deleted or updated when the parent data is deleted or updated. SET NULL.
What is cascade operation?
Operation Cascade was the codename for an Allied military deception operation during the Western Desert Campaign of World War II for North Africa.
Where do I put the delete cascade?
Edit table and columns specification by clicking … as shown in the below image.Select the parent table and the primary key column in the parent table. … In the INSERT and UPDATE specifications, select Cascade for the delete rule.Click on Close and save the table in the designer.More items…•
Understanding Cascade Delete in Salesforce, and Why Backup and Restore are Key
If you’ve ever lost data is Salesforce, perhaps through accidental deletion or a data merge error, you know how frustrating it can be to retrieve that data.
Cascade what?
Essentially, cascade deletion is a by-product of Salesforce’s file structure, and particularly, the parent-child relationship between records.
How can cascade delete introduce risk to your data?
If you were to accidentally delete an account in Salesforce, you could see the account in your recycle bin up until the bin is purged. However, you wouldn’t see the associated contacts, opportunities or other associated items that would also be deleted in the purge.
Cascade deletion makes manual recovery a challenge
Restoring accidentally deleted Salesforce data can be difficult and time consuming – and cascade deletion complicates things further. Lost records need to be re-added in a specific order, and the referenced IDs in the child records must all be replaced as well.
How to reduce the risk of data loss with backup and restore
Cascade delete functionality is powerful – it’s powerfully good when a deletion is intentional, and powerfully complicating when data was deleted in error.
What is cascade delete?
It’s actually a general relational database term used to describe the process by which child records are automatically deleted when their parent record is deleted or in salesforce.com (Master / Detail records
What happens when you delete parent in bulk?
It’s deleting parent records who are in mast-detail relationship. When you delete parent in bulk it will delete all child records as well in bulk. This is cascade delete.
In a chain of lookup relationships, these behaviors work independently on each target field at each level
For example, field A is the target lookup of field B, which is the target lookup of field C. You can have a delete restriction on A and none on B, which means that A can’t be deleted but B can. Once B is deleted, the relationship between A and B no longer exists and C will hold an empty value for the lookup.
In a multilevel lookup relationship, these options might conflict
For example, in the scenario where field A is the target lookup of field B, which is the target lookup of field C, you might specify that A can delete B, but B can’t be deleted because it’s in a relationship with C. If you try to delete A, you’ll get an error saying that B can’t be deleted because it’s linked to C.
Note on Field History Tracking
If the parent record in a lookup relationship is deleted, the field history tracking for the child record does not record the deletion. For example, if a parent account is deleted, the Account History related list for the child account does not show the deletion.
How Cascade Delete Poses a Risk To Your Salesforce Data
Cascade delete, while useful for intentional deletions, increases the number of items that can be accidentally deleted without an admin noticing. In cases of accidental deletion, admins may miss the associated deletion of any child or grandchild objects, making it difficult to identify exactly which data was lost.
A Cascade Deletion Makes It Difficult To Recover Lost Data
Restoring accidentally deleted Salesforce data is a manual and labor intensive process, and cascade delete can compound the process. First, you would need to go through your backups (assuming you have them) to find all of the accounts that were deleted and restore them.
Eliminate Data Downtime with OwnBackup
Cascade delete functionality can be powerful – in both good and bad ways. But by having a cloud data protection solution in place, like Salesforce recommends, you can restore deleted data quickly and easily.
In a chain of lookup relationships, these behaviors work independently on each target field at each level
For example, field A is the target lookup of field B, which is the target lookup of field C. You can have a delete restriction on A and none on B, which means that A can’t be deleted but B can. Once B is deleted, the relationship between A and B no longer exists and C will hold an empty value for the lookup.
In a multilevel lookup relationship, these options might conflict
For example, in the scenario where field A is the target lookup of field B, which is the target lookup of field C, you might specify that A can delete B, but B can’t be deleted because it’s in a relationship with C. If you try to delete A, you’ll get an error saying that B can’t be deleted because it’s linked to C.
Note on Field History Tracking
If the parent record in a lookup relationship is deleted, the field history tracking for the child record does not record the deletion. For example, if a parent account is deleted, the Account History related list for the child account does not show the deletion.
What is cascade delete?
It’s actually a general relational database term used to describe the process by which child records are automatically deleted when their parent record is deleted or in salesforce.com (Master / Detail records
What happens when you delete parent in bulk?
It’s deleting parent records who are in mast-detail relationship. When you delete parent in bulk it will delete all child records as well in bulk. This is cascade delete.
