How to know whether the created view is valid or not

问题

I am new db.

Lets say I have created a view with force.

So how can I get know whether the view created is invalid or not?

I mean are there any queries from which I can get to know the validity status of the view?

Thanks.

回答1:

You can use Oracle dictionary view user_objects:

select object_name, status from user_objects 
where object_type = 'VIEW' and object_name = 'YOUR_VIEW';

If the table on which the view is based is altered for any reason, you may have to recompile the view. For example, if a table’s structure is altered, such as by a change to a column’s datatype, or perhaps if a column is dropped from the table altogether - a column that is used by the view — then it may change the status of the view to 'INVALID'.

Also note that there are there versions of "all objects" view:

USER_OBJECTS - all objects owned by a current user;
ALL_OBJECTS - all objects on which a current user has any privileges;
DBA_OBJECTS - all database objects (you would need special privileges to access this view)

ALL_ and DBA_ versions have an additional column OWNER containing the owner of the object.

回答2:

Maybe this helps:

SELECT object_name,
       status
  FROM user_objects
 WHERE object_type = 'VIEW';

or (for views in all schemas)

SELECT owner,
       object_name,
       status
  FROM all_objects
 WHERE object_type = 'VIEW';

回答3:

Apart from checking the status about that new view in the dictionary, you can do:

 select 1 from OWNER.MY_NEWLY_CREATED_VIEW;

 select count(*) from OWNER.MY_NEWLY_CREATED_VIEW;

Whatever the statement of your new view, from that feedback you know it works or not.

来源：https://stackoverflow.com/questions/26967458/how-to-know-whether-the-created-view-is-valid-or-not

标签

Oracle

sqlplus