Notes 'cache' issue

I have produced a set of video quizzes for learners of French; for more information visit:
http://www.ashcombe.surrey.sch.uk/ipod/ipod.html
or
http://ashcombeweb.blogspot.com/
However, the use of in excess of sixty hyperlinked 'notes' has thrown up an issue to which I do not have a solution - yet!
There seems to be some sort of cache within the iPod. During testing, after I have completed one of my quizzes (and in so doing, clicked on one of several available hyperlinks on each page), if I then choose to do the same test again, the iPod 'remembers' which links I clicked and has them already selected, which doesn't make for much of a challenge! Even if I complete a different quiz, when I return to the previous ones, my answers are still selected!
Is there any way to overcome this issue?
iMac 24" Core 2 Duo and MacBook Core Duo Mac OS X (10.4.8) 80Gb video iPod and 4Gb Nano

hi..
Go through [http://orainternals.wordpress.com/2009/06/02/library-cache-lock-and-library-cache-pin-waits/]
Anand

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dtrace: script './zfs_list.d' matched 4828 probes
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dtrace: script './zfs_list.d' matched 4828 probes
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0      -> spa_guid
0      <- spa_guid
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0          <- arc_reclaim_needed
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0        <- arc_evict_needed
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0            <- zio_walk_parents
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0            <- spa_config_enter
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0                <- spa_get_random
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0                  -> zio_add_child
0                  <- zio_add_child
0                <- zio_create
0              <- zio_vdev_child_io
0              -> zio_nowait
0                -> zio_execute
0                  -> zio_vdev_io_start
0                    -> spa_syncing_txg
0                    <- spa_syncing_txg
0                    -> zio_buf_alloc
0                    <- zio_buf_alloc
0                    -> zio_push_transform
0                    <- zio_push_transform
0                    -> vdev_mirror_io_start
0                      -> vdev_mirror_map_alloc
0                      <- vdev_mirror_map_alloc
0                      -> vdev_mirror_child_select
0                        -> vdev_readable
0                          -> vdev_is_dead
0                          <- vdev_is_dead
0                        <- vdev_readable
0                        -> vdev_dtl_contains
0                        <- vdev_dtl_contains
0                      <- vdev_mirror_child_select
0                      -> zio_vdev_child_io
0                        -> zio_create
0                          -> zio_add_child
0                          <- zio_add_child
0                        <- zio_create
0                      <- zio_vdev_child_io
0                      -> zio_nowait
0                        -> zio_execute
0                          -> zio_vdev_io_start
0                            -> vdev_cache_read
0                              -> vdev_cache_allocate
0                              <- vdev_cache_allocate
0                            <- vdev_cache_read
0                            -> vdev_queue_io
0                              -> vdev_queue_io_add
0                              <- vdev_queue_io_add
0                              -> vdev_queue_io_to_issue
0                                -> vdev_queue_io_remove
0                                <- vdev_queue_io_remove
0                              <- vdev_queue_io_to_issue
0                            <- vdev_queue_io
0                            -> vdev_accessible
0                              -> vdev_is_dead
0                              <- vdev_is_dead
0                            <- vdev_accessible
0                            -> vdev_disk_io_start
0                            <- vdev_disk_io_start
0                          <- zio_vdev_io_start
0                        <- zio_execute
0                      <- zio_nowait
0                    <- vdev_mirror_io_start
0                  <- zio_vdev_io_start
0                  -> zio_vdev_io_done
0                    -> zio_wait_for_children
0                    <- zio_wait_for_children
0                  <- zio_vdev_io_done
0                <- zio_execute
0              <- zio_nowait
0            <- vdev_mirror_io_start
0          <- zio_vdev_io_start
0          -> zio_vdev_io_done
0            -> zio_wait_for_children
0            <- zio_wait_for_children
0          <- zio_vdev_io_done
0        <- zio_execute
0      <- zio_nowait
0    <- arc_read_nolock
0 <- arc_read                              I've compared the output of a single-non cached metadata read, to a single read from filesystem by running dd and read from a file that is not in the cache. The only difference in the stack is that the non-cached reads are missing:
0                                -> vdev_queue_offset_compare
0                                <- vdev_queue_offset_compare This is called in "-> vdev_queue_io_to_issue ". But I don't think this is relevant, perhaps related to metadata vs file data read.
What do you think should be next?

EJB CMP remove create cache issue? DuplicateKeyException

EJB CMP remove create cache issue? DuplicateKeyException
Hi I have an EJB 2.1 application using CMP. Most things work fine. But if I in a transaction tries to remove a bean and create a new one with the same primary key I get a DuplicateKeyException:
2007-11-16 09:25:31,963 ERROR [RMICallHandler-6] AdminGroupData_ConcreteSubClass147 - Error adding AccessRules:
javax.ejb.DuplicateKeyException: Exception [EJB - 10007]: Exception creating bean of type [AccessRulesData]. Bean already exists.
at oracle.toplink.internal.ejb.cmp.EJBExceptionFactory.duplicateKeyException(EJBExceptionFactory.java:195)
I suspect that the remove call only removes from the cache (until commit), but that the create call checks the database or something?
My code is simple like the following:
AdminPreferencesDataLocal apdata1 = adminpreferenceshome.findByPrimaryKey(certificatefingerprint);
adminpreferenceshome.remove(certificatefingerprint);
adminpreferenceshome.create(certificatefingerprint,newadminpreference);
Is there some configuration I can set in toplink-ejb-jar.xml to fix this?
I use OC4j 10.1.3.3
Cheers,
Tomas

The bean.remove() was executed but the sql DELETE was executed to the database as the result, oc4j manages all sql statements and they are optimized to commit to the database in batch at once when the transaction commit. Oc4j ejb container is smart and preventing you from creating the same entity cached in the transaction because the sql delete was not really committed to the database when the create is called.
My guess is that the reason it works with IBM WAS was because it issued sql for each remove/create call right away instead of doing them in batch as oc4j, or your WAS remove then create were called in separate transactions.

Notes 'cache' issue

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