I’m trying to learn more about the “foreign key references check” query plan operator introduced in SQL Server 2016. There’s not a lot of information about it out there. Microsoft announced it here and I blogged about it here. The new operator can be seen by deleting a row from a parent table with 254 or more incoming foreign key references. dbfiddle link.
There are three different counts displayed in the operator details:
- Foreign Key References Count is the number of incoming foreign keys.
- No matching Indexes Count is the number of incoming foreign keys without a suitable index. Verifying that the updated or deleted table won’t violate that constraint will require a scan of a child table.
- I don’t know what Partial Matching Indexes Count represents.
What is a partial matching index in this context? I wasn’t able to get any of the following to work:
- Filtered indexes
- Indexes with the foreign key column as the second key column
- Single column indexes for multiple column foreign keys
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