Slow fetch processing of simple sql

Question

Hi!
I have a query:
SELECT A.PID, A.ID, A.NAME, (SELECT COUNT(*)
FROM
TREE_VIEW B WHERE B.PID = A.ID) BRANCH_COUNT FROM TREE_VIEW A WHERE A.PID =
  V('P30_BRANCH_ID') ORDER BY ID
Table CN_SECTION has 131 000 rows, TREE_VIEW - view, which only limit number of columns of table.
From external system query runs 5 seconds, but on DB (from TOAD) it runs 0.5sec.
TKPROOF:
SQL ID: 7m1ykt8rc626r
Plan Hash: 1808150050
SELECT A.PID, A.ID, A.NAME, (SELECT COUNT(*)
FROM
TREE_VIEW B WHERE B.PID = A.ID) BRANCH_COUNT FROM TREE_VIEW A WHERE A.PID =
  V('P30_BRANCH_ID') ORDER BY ID
call   count  cpu elapsed disk query  current  rows
Parse  1   0.00   0.00   0   0   0   0
Execute   1   0.00   0.00   0   0   0   0
Fetch   1   4.87   5.50   0   16330   0   22
total  3   4.87   5.50   0   16330   0   22
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 68  (recursive depth: 2)
Rows  Row Source Operation
   22  SORT AGGREGATE (cr=15620 pr=0 pw=0 time=0 us)
   0   TABLE ACCESS FULL CN_SECTION (cr=15620 pr=0 pw=0 time=0 us cost=206 size=120 card=24)
   22  SORT ORDER BY (cr=16330 pr=0 pw=0 time=84 us cost=221 size=336 card=24)
   22   TABLE ACCESS FULL CN_SECTION (cr=710 pr=0 pw=0 time=2457 us cost=220 size=336 card=24)
I think the problem is in FETCH. Why it could be? Can I something do to fix it?

Answer 1

Hi ElectroD,
You are using a function to get the value of P30_BRANCH_ID.  Have you tried using a bind variable instead ?
If in Apex, use :P30_BRANCH_ID
If outside Apex, define a variable for this value or pass it as a parameter and use that variable in your query.
Patrick