Accessing downloaded content in../Library/Caches with LoaderMax

Hi,
I am trying to port an air for android app to iOS and my main problem has to do with downloaded content.
I have a number of assets ( images and mp3's) that i download and place in the ../Library/Caches folder accordingto the apple guidelines.
My Code relies heavily on Greensock LoaderMax to load the assets into the application.
This works very well on android but i cant get LoaderMax fo find the files on iOS.
i get the following error when debugging on OSX:
i add a number of files with:
                              var queue:LoaderMax = new LoaderMax({name:"soundQueue", onComplete:loopSoundsCompleteHandler, onError:errorHandler});
                                                  fileName = "Library/Caches/" + fileName;
                                        queue.append( new MP3Loader(fileName, {name:"name1", repeat:-1, autoPlay:false}) );
and then i load the queue with
queue.load();
and i reveice the following error:
Error on MP3Loader 'bpallah' (Library/Caches/resources/snd/bpall.mp3): Error #2032: Stream Error. URL: app:/Library/Caches/resources/snd/bpall.mp3
Does anyone have a clue how to do this?
regards,
/Lars

With AIR 3.6 latest prerelease, A new static property, File.cacheDirectory has been added, which points to the <APPLICATION_HOME>/Library/Caches directory on iOS devices, and files in this directory are not backed up. So, the above workaround is not required.
Another property, preventBackup is introduced in the File API, which when set prevents a file or a folder from getting backed up on the iCloud. This property works on iOS 5.1 devices and later.
You can find additional details on this feature here<http://labsdownload.adobe.com/pub/labs/flashruntimes/shared/air3-6_flashplayer11-6_release notes.pdf>

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High library cache load lock waits in AWR

Hi All,
Today i faced a significant performance problem related to shared pool. I made some observations, thought it would be a nice idea to share them with Oracle experts. Please feel free to add your observations/recommendations and correct me where i am wrong.
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Snap Id Snap Time Sessions Cursors/Session
Begin Snap: 9994 29-Jun-09 10:00:07 672 66.3
End Snap: 10001 29-Jun-09 17:00:49 651 64.4
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Per Second Per Transaction
Redo size: 248,954.70 23,511.82
Logical reads: 116,107.04 10,965.40
Block changes: 1,357.13 128.17
Physical reads: 125.49 11.85
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Parses: 235.22 22.21
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Instance Efficiency
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 99.92 In-memory Sort %: 100.00
Library Hit %: 98.92 Soft Parse %: 97.95
Execute to Parse %: 71.35 Latch Hit %: 99.98
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Shared Pool Statistics
Begin End
Memory Usage %: 81.01 81.92
% SQL with executions>1: 88.51 86.93
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Top 5 Timed Events
Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class
library cache load lock 24,243 64,286 2,652 26.5 Concurrency
db file sequential read 1,580,769 42,267 27 17.4 User I/O
CPU time   33,039   13.6
latch: library cache 53,013 29,194 551 12.0 Concurrency
db file scattered read 151,669 13,550 89 5.6 User I/O Problem-1: Contention on Library cache: May be due to under-sized shared pool, incorrect parameters, poor application design, But since we already observed that most of the parses are soft parses and shared pool usgae in 80%, seems problem related to holding cursors. open_cursors/session_cached_cursors are red flags.
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Wait Class
Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn
Concurrency 170,577 44.58 109,020 639 0.64
User I/O 2,001,978 0.00 59,662 30 7.49
System I/O 564,771 0.00 8,069 14 2.11
Application 145,106 1.25 6,352 44 0.54
Commit 176,671 0.37 4,528 26 0.66
Other 27,557 6.31 2,532 92 0.10
Network 6,862,704 0.00 696 0 25.68
Configuration 3,858 3.71 141 37 0.01
Wait Events
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn
library cache load lock 24,243 83.95 64,286 2652 0.09
db file sequential read 1,580,769 0.00 42,267 27 5.91
latch: library cache 53,013 0.00 29,194 551 0.20
db file scattered read 151,669 0.00 13,550 89 0.57
latch: shared pool 25,403 0.00 12,969 511 0.10
log file sync 176,671 0.37 4,528 26 0.66
enq: TM - contention 1,455 90.93 3,975 2732 0.01 Instance Activity Stats
opened cursors cumulative 5,290,760 209.60 19.80
parse count (failures) 6,181 0.24 0.02
parse count (hard) 121,841 4.83 0.46
parse count (total) 5,937,336 235.22 22.21
parse time cpu 283,787 11.24 1.06
parse time elapsed 1,687,096 66.84 6.31 Latch Activity
library cache 85,042,375 0.15 0.43 29194 304,831 7.16
library cache load lock 257,089 0.00 1.20 0 69,065 0.00
library cache lock 41,467,300 0.02 0.07 6 2,714 0.07
library cache lock allocation 730,422 0.00 0.44 0 0
library cache pin 28,453,986 0.01 0.16 8 167 0.00
library cache pin allocation 509,000 0.00 0.38 0 0 Init.ora parameters
cursor_sharing= EXACT
open_cursors= 3000
session_cached_cursors= 0
-- open_cursors value is too high. I have checked that maximum usage by a single session is 12%.
-- session_cached_cursors are 0 causing soft parsing. 500/600 is good number to start with.
cursor_sharing exact may cause hard parses. But here, hard parsing is comparatively small, we can ignore this.
From v$librarycache
NAMESPACE             GETS    GETHITS GETHITRATIO       PINS PINHITRATIO    RELOADS INVALIDATIONS
SQL AREA            162827      25127 .154317159 748901435 .999153087     107941         81886-- high invalidation count due to DDL like activities.
-- high reloads due to small library cache.
-- hit ratio too small.
-- Need to pin frequently executed objects into library cache.
P.S. Same question asked on Oracle_L, but due to formatting reasons, pasing duplicate contents here.
Regards,
Neeraj Bhatia
Edited by: Neeraj.Bhatia2 on Jul 13, 2009 6:51 AM

Thanks Charles. I really appreciate your efforts to diagnose the issue.
I agree with you performance issue is caused by soft parsing, which can be solved by holding cursors (session_cached_cursors). It may be due to oversized shared pool, which is causing delay in searching child cursors.
My second thought is, there is large number of reloads, which can be due to under-sized shared pool, if invalidation activities are not going (CBO statistics collection, DDL etc), cursors are being flushed frequently.
CPU utilization is continuously high (above 90%). Pasting additional information from same AWR report.
Namespace                Get Requests       Pct Miss        Pin Requests         Pct Miss      Reloads        Invalidations
BODY                       225,345               0.76            4,965,541            0.15           5,533           0
CLUSTER                   1,278                  1.41            2,542                  1.73           26                0
INDEX                       5,982                  9.31            13,922                7.35           258               0
SQL AREA                  141,465              54.10           27,831,235         1.21           69,863          19,085 Latch Miss Sources
Latch Name             Where                                         NoWait Misses                 Sleeps             Waiter Sleeps
library cache lock       kgllkdl: child: no lock handle             0                                   8,250                   5,792 Time Model Statistics
Statistic Name                                                                           Time (s)                               % of DB Time
sql execute elapsed time                                                           206,979.31                                      85.27
PL/SQL execution elapsed time                                                    94,651.78                                      39.00
DB CPU                                                                                     33,039.29                                      13.61
parse time elapsed                                                                      22,635.47                                       9.33
inbound PL/SQL rpc elapsed time                                                  14,763.48                                       6.08
hard parse elapsed time                                                               14,136.77                                       5.82
connection management call elapsed time                                        1,625.07                                       0.67
PL/SQL compilation elapsed time                                                        760.76                                       0.31
repeated bind elapsed time                                                               664.81                                       0.27
hard parse (sharing criteria) elapsed time                                             500.11                                       0.21
Java execution elapsed time                                                              252.95                                       0.10
failed parse elapsed time                                                                   167.23                                       0.07
hard parse (bind mismatch) elapsed time                                             124.11                                       0.05
sequence load elapsed time                                                                23.34                                        0.01
DB time                                                                                   242,720.12
background elapsed time                                                             11,645.52
background cpu time                                                                      247.25 According to this DB CPU is 65% utilization (DB CPU + Background CPU / Total Available CPU seconds). While at the same time DB host was 95% utilized (confirmed from DBA_HIST_SYSMETRIC_SUMMARY).
Operating System Statistics
Statistic                                         Total
BUSY_TIME                             3,586,030
IDLE_TIME                              1,545,064
IOWAIT_TIME                              22,237
NICE_TIME                                           0
SYS_TIME                                  197,661
USER_TIME                              3,319,452
LOAD                                                 11
RSRC_MGR_CPU_WAIT_TIME                  0
PHYSICAL_MEMORY_BYTES          867,180
NUM_CPUS                                           2

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Accessing downloaded content in../Library/Caches with LoaderMax

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