Performace issue in Oracle 10.1.0.4

Question

Hi,
I am having the database with version 10.1.0.4 on solaris environment, I am having the strange problem with open cursors, set the open_cursors paremeter has 1000, but in the snapshot cursors/session showing 1200 and the count is gradually increasing and sometimes found upto 15000. Secondly, parse 2 execute ratio is ~86%.
I am not getting any error related to open_cursors but users are reporting the very slow response of the performance. Application upload bulk logs in the database and use bind variables.
RAM -> 8G
The value of below parameters:
open_cursors=1000
session_cached_cursor=150
cursor_sharing=similar
SGA=3.5GB
Please help to find out the rootcause of the issue and suggestion to resolve this.
Thanks in advance,
Subash

Answer 1

select 'session_cached_cursors' parameter,
lpad(value, 5) value,
decode(value, 0, ' n/a', to_char(100 * used / value, '990') || '%') usage
from ( select max(s.value) used
from v$statname n,
v$sesstat s
where n.name = 'session cursor cache count'
and s.statistic# = n.statistic#
( select value
from v$parameter
where name = 'session_cached_cursors'
union all
select 'open_cursors', lpad(value, 5),
to_char(100 * used / value, '990') || '%'
from ( select max(sum(s.value)) used
from v$statname n,
v$sesstat s
where n.name in ( 'opened cursors current',
'session cursor cache count')
and s.statistic# = n.statistic#
group by s.sid
( select value
from v$parameter
where name = 'open_cursors');
and check ... what session open many cursors
select a.value, s.username, s.sid, s.serial#, s.machine
from gv$sesstat a, gv$statname b, gv$session s
where a.statistic# = b.statistic# and s.sid=a.sid
and b.name = 'session cursor cache count' order by a.value;
Or get information on session open > 1000 cursors ;)
select SADDR,SID,USER_NAME,ADDRESS,HASH_VALUE,SQL_ID,SQL_TEXT from v$open_cursor where sid in (SELECT sid FROM V$OPEN_CURSOR group by sid having count(*)>1000)