Write sql for plsql record

Question

im trying to builde plsql table like given below
ids               nme
1     ICOL$
2     CON$
3     UNDO$
4     PROXY_ROLE_DATA$
5     FILE$
6     UET$
7     IND$
8     SEG$
9     COL$
10     CLU$then trying to get value for ids 5 is FILE$ but it's not working as expected. please find the code below.
declare
type v_ty is record
( ids  array,
  nme array_char);
v_r  v_ty;
v_ids number;
begin
select rownum idx ,table_name tnme
bulk collect into v_r
from user_tables
where rownum < 11;
select b.column_value into v_ids
from table(v_r.ids) a , table(v_r.nme) b
where a.column_value = 5;
end;thanks
Raj
Edited by: user13397097 on Jan 2, 2013 12:46 AM

Answer 1

user13397097 wrote:
dose it not bring down the context switch between plsql and sql engine ?Well if you manage to do the data modification in a single SQL query, that would be 1 context switch.
In your case there is at least 2 of them.
Moreover : You seems to be fighting against context switch. Did you identify that as being the bottleneck in your processing ?
The basic example of costly context switch is calling a PLL/SQL function in a where clause when you could do it purely in SQL. In that cas the main SQL does a context switch on each row tested, and if the PL/SQL function is actually doing SQL inside, that is another "nested" context switch.
Doing so on a million rows would "hurt" performance wise.