To get list of materialized views/views using a column of a table

Question

Hi,
    I am removing sal column from table tab_emp;
i want to check whether any materialized view or view using this column by  querying using data dictionary :-
if i use like condition against query column of all_mviews it is throwing error sicne it is long data type.
is there a way to search it without creating any function and use it in a query
Thanks,
Ajoy

Answer 1

start with select * from dictionary where table_name like '%VIEW%'
to identify appropriate dictionary views.
Then read: Ask Tom "Converting Longs to LOBS" and Ask Tom "Long to Varchar2 conversion.... "
to be able to search LONG descriptions for column names.
For example:
create table check_table as
select owner,view_name,text_length,to_lob(text) text_lob from all_views
Column Name
Data Type
Nullable
Default
Primary Key
OWNER
VARCHAR2(30)
No
VIEW_NAME
VARCHAR2(30)
No
TEXT_LENGTH
NUMBER
Yes
TEXT_LOB
CLOB
Yes
select * from check_table where instr(upper(text_lob),'SAL') > 0
OWNER
VIEW_NAME
TEXT_LENGTH
TEXT_LOB
SYS
USER_ENCRYPTED_COLUMNS
147
select TABLE_NAME, COLUMN_NAME, ENCRYPTION_ALG,SALT, INTEGRITY_ALG from DBA_ENCRYPTED_COLUMNS where OWNER = SYS_CONTEXT('USERENV','CURRENT_USER')
Regards
Etbin