Extra overhead with Collection and List types

The documentation says about Collection and List types :
"There is extra overhead for Kodo to maintain collections where each
element is not guaranteed to be unique."
Why is it so ?
Thanks in advance.
Regards.

We can make some optimizations when we know each element is unique.

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Edited by: Mindie on Mar 28, 2008 8:12 AM
Edited by: Mindie on Mar 28, 2008 8:13 AM
Edited by: Mindie on Mar 28, 2008 8:13 AM
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Hi,
I'm trying to use collection in my code in 10g database
declare
cursor c_cur
is
select * from table;
TYPE tbl_cur_lines IS TABLE OF c_cur%ROWTYPE
      INDEX BY BINARY_INTEGER;
      l_cur_rec    tbl_cur_lines;
begin
OPEN c_cur;
FETCH c_cur BULK COLLECT INTO l_cur_rec;
CLOSE c_open_trx;
FOR i IN 0..l_cur_rec.COUNT-1
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declare
cursor c_cur
is
select * from table;
TYPE tbl_cur_lines IS TABLE OF c_cur%ROWTYPE
      INDEX BY BINARY_INTEGER;
      l_cur_rec    tbl_cur_lines;
begin
OPEN c_cur;
FETCH c_cur BULK COLLECT INTO l_cur_rec;
CLOSE c_open_trx;
FOR i IN l_cur_rec.FIRST..l_cur_rec.LAST
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ORA-06502: PL/SQL: numeric or value error
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Thanks in advance!
Edited by: user641008 on Jun 3, 2011 2:31 PM

FOR i IN 0..l_cur_rec.COUNT-1
here, index "i" expect an integer value and it is getting and integer, hence not
giving an error, though your cursor did not fetch any row.
in the next case,
FOR i IN l_cur_rec.FIRST..l_cur_rec.LAST
your cursor did not fetch any row and hence
first element in your collection is NULL( in other words, there is no index value in collection) while "i" is expecting an integer,
thats why you are getting error "ORA-06502: PL/SQL: numeric or value error"
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declare
cursor c_cur
is
select * from table;
TYPE tbl_cur_lines IS TABLE OF c_cur%ROWTYPE
      INDEX BY BINARY_INTEGER;
      l_cur_rec    tbl_cur_lines;
begin
OPEN c_cur;
FETCH c_cur BULK COLLECT INTO l_cur_rec;
CLOSE c_cur;
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create or replace type gg_audit_object as object (
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CREATE OR REPLACE TYPE gg_audit_table AS TABLE OF gg_audit_object
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v_owner varchar2(30);
v_table_name varchar2(30);
v_column_name varchar2(30);
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owner varchar2(30),
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sql_stmt varchar2(5000);
cursor table_select is
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g.table_name,
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open table_cr for sql_stmt;
FETCH table_cr into r1;
close table_cr;
-- here's where I'm stumped. I need to take the values from r1 and put them
-- into t1.
-- Something like this (or whatever is the correct way to do it)
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Found the perfect example on Ask Tom. Here is the solution.
create or replace package GG_AUDIT
as
type rc is ref cursor;
procedure GG_AUDIT_PROC( r_cursor in out types.cursorType );
end;
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as
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is
l_data gg_audit_table := gg_audit_table();
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type v_record is record(
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table_name varchar2(30),
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v_owner varchar2(30);
v_table_name varchar2(30);
v_column_name varchar2(30);
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g.table_name,
g.column_name
from gg_tables_to_audit g
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end;
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Message was edited by: Bhavesh Kantilal

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Extra overhead with Collection and List types

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