|Oracle9i SQL Reference
Release 2 (9.2)
Part Number A96540-01
SQL Statements: ALTER TRIGGER to COMMIT , 5 of 11
VIEW statement to explicitly recompile a view that is invalid. Explicit recompilation lets you locate recompilation errors before run time. You may want to recompile a view explicitly after altering one of its base tables to ensure that the alteration does not affect the view or other objects that depend on it.
You can also use
VIEW to define, modify, or drop view constraints.
When you issue an
VIEW statement, Oracle recompiles the view regardless of whether it is valid or invalid. Oracle also invalidates any local objects that depend on the view.
The view must be in your own schema or you must have
TABLE system privilege.
Specify the schema containing the view. If you omit
schema, then Oracle assumes the view is in your own schema.
Specify the name of the view to be recompiled.
ADD clause to add a constraint to
CONSTRAINT clause to change the
NORELY setting of an existing view constraint.
Restriction on modifying constraints: You cannot change the setting of a unique or primary key constraint if it is part of a referential integrity constraint without dropping the foreign key or changing its setting to match that of
DROP clause to drop an existing view constraint.
Restriction on dropping constraints: You cannot drop a unique or primary key constraint if it is part of a referential integrity constraint on a view.
COMPILE keyword is required. It directs Oracle to recompile the view.
To recompile the view
customer_ro (created in "Creating a Read-Only View: Example"), issue the following statement:
If Oracle encounters no compilation errors while recompiling
customer_ro becomes valid. If recompiling results in compilation errors, then Oracle returns an error and
customer_ro remains invalid.
Oracle also invalidates all dependent objects. These objects include any procedures, functions, package bodies, and views that reference
customer_ro. If you subsequently reference one of these objects without first explicitly recompiling it, then Oracle recompiles it implicitly at run time.