Dependencies on view (how to get it invalid )

Question

hi guys,
was reading the concept guide and came upon this
its on page 157 chapter 6-5
under
<Data Warehousing Considerations>
<i>
Some data warehouses drop indexes on tables at night to facilitate faster loads.
However, all views dependent on the table whose index is dropped get invalidated.
This means that subsequently running any package that reference these dropped
views will invalidate the package.
Remember that whenever you create a table, index, and view, and then drop the index,
all objects dependent on that table are invalidated, including views, packages, package
bodies, functions, and procedures. This protects updatable join views. </i>
done a test but doesnt seems to be what is describe above.
SCOTT@orcl> create index testidx on dept(dname);
Index created.
SCOTT@orcl> create view testview as SELECT * FROM DEPT;
View created.
SCOTT@orcl> DROP INDEX testidx;
Index dropped.
SCOTT@orcl> select status from useR_objects where object_name = 'TESTVIEW';
STATUS
VALID
Well it did not get invalid
q1) did i miss up anything
q2) what is updatable join views. ?
Please advice
Regards,
Noob
Edited by: OracleWannabe on Jun 24, 2009 10:50 AM

Answer 1

A simple test case with 10.2.0.1 cannot reproduce the documented behaviour:
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE     10.2.0.1.0     Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL> drop table t;
Table supprimee.
SQL> drop view v;
Vue supprimee.
SQL> whenever sqlerror exit failure;
SQL> create table t as select * from all_objects;
Table creee.
SQL> create index i on t(object_name);
Index cree.
SQL> create view v as select * from t;
Vue creee.
SQL> exec dbms_stats.gather_table_stats(ownname => user, tabname  => 'T', cascade => true);
Procedure PL/SQL terminee avec succes.
SQL> select count(*) from v where object_name = 'T';
  COUNT(*)
      6
SQL> explain plan for select count(*) from v where object_name = 'T';
Explicite.
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 2079104444
| Id  | Operation       | Name | Rows  | Bytes | Cost (%CPU)| Time      |
|   0 | SELECT STATEMENT  |      |     1 |    25 |     1   (0)| 00:00:01 |
|   1 |  SORT AGGREGATE   |      |     1 |    25 |           |       |
|*  2 |   INDEX RANGE SCAN| I      |     2 |    50 |     1   (0)| 00:00:01 |
Predicate Information (identified by operation id):
PLAN_TABLE_OUTPUT
   2 - access("OBJECT_NAME"='T')
14 ligne(s) selectionnee(s).
SQL> select status from user_objects where object_name = 'V';
STATUS
VALID
SQL> drop index i;
Index supprime.
SQL> select status from user_objects where object_name = 'V';
STATUS
VALID