Order by cause query to hang

Question

Dear all,
I have a simple query to join two tables. Table schema are as follows
==============================================
Table A
id number,
name varchar(32)
Table B
account_id reference Table A(id)
login varchar(32),
password varchar(32)
==============================================
In CGI, my run these test queries.
No order statement and select 3 columns.
1. Select a.name, b.login,b.password
From TableA a, TableB b
Where a.id=b.account_id;
====>OK
With order statement and select 3 columns, 2 from table B.
2. Select a.name,b.login,b.password
From TableA a, TableB b
Where a.id=b.account_id
Order by a.name;
==>BAD, CGI never returns.
With order statement and select 2 columns, 1 from table B.
3. Select a.name,b.login
From TableA a, TableB b
Where a.id=b.account_id
Order by a.name;
==>OK
With order statement and select 3 columns, 2 from table A.
4. Select a.id, a.name,b.login
From TableA a, TableB b
Where a.id=b.account_id
Order by a.name;
==>BAD. CGI never returns.
Without order statement and select 3 columns, 2 from table A.
4. Select a.id, a.name,b.login
From TableA a, TableB b
Where a.id=b.account_id;
==>BAD. CGI never returns
======================================================
It appears to me that if i use more system resources by selecting more columns or use order statement, query will not return.
Can someone help?
Thanks

Answer 1

Check execution plan of your query.
if query id joined in hash join then provide hint for nested loop
if query is joined in sort merge join the create index on respective columns
if both of methods are not working then
check you init.ora paremeter sort_area size and sort_area_retain size. if they are less then increase the size.
u can select above parameter from V$PARAMETER dynamic view
select * from v$parameter where name like 'sort%'
Regards
Juned