VARRAYS - how to use in sub procedures and how to empty them?

Hi!
I made a procedure where i use three diffrent varrays. I got it working only after
putting all code in one big MAIN-block. Looks nasty.
If i try to use sub-procedures i allways got ORA-06531-message.
= "Reference to uninitialized collection"
How can i use varrays in sub-procedures? Is there some trick in delcare or in procedure call?
I try to use IN OUT parameters, but i didn't get it working. Run out of time in trial and error, of cource...
I seemed to me that varrays aren't same way usable allover in code as all other variables i have declared.
Is it so?
Now the MAIN-block is long as a year... I'm used to code short MAIN-block with many sub-procedures calls.
(In same procedure, not different procedures in db).
Another problem is how to empty a varray in effective way?
I tried my_varray.DELELTE and my_varray.TRIM but they won't do the thing. These remove/trim the elements but i just need to
empty varray before fetching a new line from db. If I my_varray := NULL; then that same ORA-06531 when next read/write in varray.
Now i just use FOR i IN 1..120 LOOP
my_varray(i) := NULL;
END LOOP;
but there must be better way, hope so.
Cheers,
SL

You were rigth "3360" - i had three varrays too many. Just to the grabage bin and some recoding.
The link you posted show me the way: Associative Arrays
- easy to declare, easy to use, works fine in sub procedures. Great - just what i need.
Thanks alot!
I fully agree W. Robertson on this:
"I often see questions on technical forums about arrays in PL/SQL, which type to use and what the differences are. Although the documentation has quite a lot to say on the subject, I feel it tries to introduce too many concepts at once and ends up being confusing, especially when it comes to choosing between VARRAYs and Nested Table collections, where most of the "which to use" advice is about collection columns of database tables (which you probably don't need), and not about PL/SQL at all."
- sl -

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V_JOB_NO NUMBER;
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                         FROM USER_SNAPSHOTS A,
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                         WHERE A.NAME = B.MV_OBJECT_NAME
                    ORDER BY B.ORDER_OF_REFRESH ASC;
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FOR I IN MV_LIST
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---------------------------------------------------------------------------------------------------------------------

Justin,
I think I am getting closer. I have a procedure shown just below this that updates my custom table with information from USER_SNAPSHOTS to reflect the time and status of the refresh completion:
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V_STATUS VARCHAR2(7);
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V_MV_NAME VARCHAR2(30);
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>
I want to to use Java stored procedures and triggers within the Oracle 11g XE
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>
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