How To Control File Parallel Write

We have a database that is accessed by ArcSDE, a product to modify maps. It uses BLOBs to store those maps.

We ran a load on the server and the response time was slow. By running the following query:

select event, total_waits, time_waited, avg_ms, round(ratio_to_report(time_waited) over () * 100) percent
from (select substr(event, 1, 30) event, total_waits, time_waited, round(time_waited_micro / total_waits / 1000, 2) avg_ms
from v$system_event
where wait_class in ('System I/O') union
select 'CPU' event, NULL, value, NULL
from v$sysstat
where statistic# = 12
order by 3 desc)
where rownum <= 10;

I get

EVENT TOTAL_WAITS TIME_WAITED AVG_MS PERCENT
--------------------------- -------------- ------------- -------- ---------
control file parallel write 127187 6354909 499.65 70
CPU 988274 11
db file parallel write 20461 886442 433.23 10
log file parallel write 14987 870672 580.95 10
log archive I/O 1557 18094 116.21 0
control file single write 149 10590 710.71 0
control file sequential read 136502 5219 .38 0
log file single write 56 2511 448.41 0
log file sequential read 489 492 10.05 0

BUG: 733426 says to change the event="10359 trace name context forever, level 1"