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ORA-01752: cannot delete from view without exactly one key-preserved table

Oracle Database Tips by Donald Burleson


The error ORA-01752 usually happens when a distributed transaction (via a database link) .  The docs note:

ORA-01752: cannot delete from view without exactly one key-preserved table

Cause: The deleted table either had no key preserved tables, had more than one key-preserved table, or the key-preserved table was an unmerged view or a table from a read-only view.

Action: Redefine the view or delete it from the underlying base tables.

If you want the view to be inherently updatable, it must have special treatment for key preserved tables.  A ?with check option? is designed for updatable views and it is used to prevent changes to a view that would produce rows that are not included in a sub-query. See my notes on key preserved tables:

  • The DML statement must affect only one table underlying the join.
  • For an UPDATE statement, all columns updated must be extracted from a key-preserved table. If the view has the CHECK OPTION, join columns and columns taken from tables that are referenced more than once in the view must be shielded from UPDATE.
     
  • For an INSERT statement, all columns into which values are inserted must come from a key-preserved table, and the view must not have the CHECK_OPTION.

 

If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

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