PGA Limits for 11.1.0.7 on AIX 6.1

Question

With an 11gR1 Database running under AIX I have the Impression, that requests for pga memory get an ORA-04030 too early. In the following statements there is a skript, that consumes more an more pga memory. It always stops when ~ 113MB of pga are consumed, but there should be posssible much more in my opinion. I shut down other database instances on the same server, I increased ulimit for rss and stack but the result is always the same. After the skript the 'session pga memory max' for my SID is 113MB.
Why is more pga cosumption not possible?
select name, to_number(value)/1024 KB
from v$parameter
where name like 'pga%'
or name like 'memory%'
or name like 'sga%';
NAME KB
sga_max_size 3,670,016
sga_target 3,670,016
memory_target 4,620,288
memory_max_target 6,291,456
pga_aggregate_target 950,272
create table temp_pga as
select * from v$pgastat;
select n.name, sum(t.value)/1024 KB
from v$sesstat t,
v$statname n
where n.statistic# = t.statistic#
and n.name in ('session pga memory', 'session pga memory max', 'session uga memory', 'session uga memory max')
group by n.name
order by 1;
NAME KB
session pga memory 65,484
session pga memory max 160,590
session uga memory 25,379
session uga memory max 68,069
select
s.sid,
n.name,
sum(t.value/1024) KB
from
v$statname n,
v$session s,
v$sesstat t
where
s.sid=t.sid
and n.statistic# = t.statistic#
and s.audsid = SYS_CONTEXT('userenv','sessionid')
and n.name in ('session pga memory', 'session pga memory max', 'session uga memory', 'session uga memory max')
group by
s.sid, n.name
order by 2;
SID NAME KB
94 session pga memory 1,832
94 session pga memory max 2,536
94 session uga memory 616
94 session uga memory max 1,240
declare
type array is table of long index by binary_integer;
l_data array;
begin
loop
l_data(l_data.count+1) := rpad('*',32000,'*');
end loop;
end;
FEHLER in Zeile 1:
ORA-04030: Zu wenig Prozessspeicher für Versuch 32712 Bytes zuzuweisen (koh-kghu call ,pl/sql vc2)
select n.name, sum(t.value)/1024 KB
from v$sesstat t,
v$statname n
where n.statistic# = t.statistic#
and n.name in ('session pga memory', 'session pga memory max', 'session uga memory', 'session uga memory max')
group by n.name
order by 1;
NAME KB
session pga memory 77,988
session pga memory max 291,431
session uga memory 32,088
session uga memory max 77,023
select
s.sid,
n.name,
sum(t.value/1024) KB
from
v$statname n,
v$session s,
v$sesstat t
where
s.sid=t.sid
and n.statistic# = t.statistic#
and s.audsid = SYS_CONTEXT('userenv','sessionid')
and n.name in ('session pga memory', 'session pga memory max', 'session uga memory', 'session uga memory max')
group by
s.sid, n.name
order by 2;
SID NAME KB
94 session pga memory 1,384
94 session pga memory max 113,832
94 session uga memory 616
94 session uga memory max 1,240
select n.name, v.value before, n.value after, n.unit
from
v$pgastat n,
temp_pga v
where n.name = v.name
order by n.unit, n.name;
NAME BEFORE AFTER UNIT
aggregate PGA auto target 819,505,152 715,511,808 bytes
aggregate PGA target parameter 973,078,528 973,078,528 bytes
bytes processed 21,978,394,624 22,010,895,360 bytes
extra bytes read/written 1,066,005,504 1,066,005,504 bytes
global memory bound 104,857,600 104,857,600 bytes
maximum PGA allocated 454,460,416 454,460,416 bytes
maximum PGA used for auto workareas 106,148,864 106,148,864 bytes
maximum PGA used for manual workareas 0 0 bytes
PGA memory freed back to OS 9,104,392,192 9,222,684,672 bytes
total freeable PGA memory 48,103,424 52,101,120 bytes
total PGA allocated 143,251,456 164,831,232 bytes
total PGA inuse 64,303,104 77,556,736 bytes
total PGA used for auto workareas 1,277,952 1,529,856 bytes
total PGA used for manual workareas 0 0 bytes
cache hit percentage 95 95 percent
max processes count 82 82
over allocation count 0 0
process count 49 63
recompute count (total) 5,239 5,240

Answer 1

I found my problem. After changing the ulimit parameters for the oracle user I didn't restart the listener, only the database.
As new client connections inherit their limits from the listener process the old values were still valid.