How do I recompile a view?
Use the ALTER VIEW statement to explicitly recompile a view that is invalid or to modify view constraints. Explicit recompilation lets you locate recompilation errors before run time.
How do I recompile an Oracle package?
To recompile the body of the emp_mgmt package in the schema hr , issue the following statement: ALTER PACKAGE hr. emp_mgmt COMPILE BODY; If Oracle Database encounters no compilation errors while recompiling the package body, then the body becomes valid.
How do I change the view in Oracle SQL Developer?
The NVL function is used to handle null values, so that seems to be ok. You are already using an alias “department_name”. You can also use aliases for normal columns i.e.: select column_name as “alias” from table; You can also use “create or replace view …” to change an already existing view.
What can be altered about a view?
If you remember the CREATE VIEW SQL syntax, a view can be modified by simply using the ALTER VIEW keyword instead, and then changing the structure of the SELECT statement. Therefore, let’s change the previously created view with the CREATE VIEW SQL statement by using the ALTER VIEW statement.
Does Oracle automatically recompile invalid objects?
sql and utlprp. sql scripts are provided by Oracle to recompile all invalid objects in the database. They are typically run after major database changes such as upgrades or patches.
What causes invalid objects in Oracle?
Objects go to an invalid state when a dependency is changed; a view, a package, a table, etc. For example, if you add a column to a table, any dependent views or code (packages or standalone procedures/functions) will be marked as invalid.
Where are Oracle views stored?
In Oracle, view is a virtual table that does not physically exist. It is stored in Oracle data dictionary and do not store any data. It can be executed when called. A view is created by a query joining one or more tables.
How do you change the view?
The ALTER VIEW command allows you to modify a view. A view is based on the result set from a query consisting of a SELECT statement or a UNION of two or more SELECT statements. See CREATE VIEW for further information on using a UNION. To determine if a specified view exists in the current namespace, use the $SYSTEM.
Can we update data in view?
Using Views to Update Data: If the view contains joins between multiple tables, you can only insert and update one table in the view, and you can’t delete rows. You can’t directly modify data in views based on union queries. You can’t modify data in views that use GROUP BY or DISTINCT statements.
Why can’t we put order by inside the view?
Views behave like tables whose contents are determined by the results of a query. Tables don’t have order; they’re just bags of rows. Therefore, views don’t have order either.
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How to recompile and drop an oracle view?
How to recompile the Oracle view. Recompiling a view is done using the. ALTER VIEW COMPILE; Alter view emp_high_sal compile; How to drop the Oracle view. Dropping a view is done using DROP VIEW command. Dropping a view has no effect on the base tables on which view is based.
When to recompile a view in alter view?
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 ALTER VIEW to define, modify, or drop view constraints.
Is there a way to recompile invalid objects in Oracle?
It is probably a better idea to use one of the methods provided by Oracle since they take the code dependencies into account. The UTL_RECOMP package contains two procedures used to recompile invalid objects.
What happens when you alter a view in Oracle?
When you issue an ALTER VIEW statement, Oracle Database recompiles the view regardless of whether it is valid or invalid. The database also invalidates any local objects that depend on the view. If you alter a view that is referenced by one or more materialized views, then those materialized views are invalidated.