MGP Synchronization

Eventhough I get "Sync Success" message from Mobile Sync, only MGP (Message Generator and Processor) determines whether my changes are posted to server or not. As it is an asynchronous process, how can I make sure whether my changes are uploaded to the server and I got back the fresh data with all the changes from the server ? Is there any API call or DLL so that I can check the actual status of my synchronization process? Any help would be greatly appreciated.
Thanks,
-Geethat

Hi
If that is true then our perception on MGP is not correct. The documentation says that MGP will involve after first time sync only. Also we did test that scenario - synchronizing without starting MGP. No changes are pulled or pushed.
The purpose of MGP is to apply and compose from the in ques and out ques tables to the enterprise database.
So how is it possible for the changes be applied without MGP.
If you find any info on this, please share with us.
Yugandhar

Similar Messages

MGP "record flags" from multiple tables?

Hello All.
I've run into a client requirement/business rule change that is causing problems in regards to data synchronizations and MGP processing. Hopefully, someone here can provide some insight in this situation.
We have three tables in the scenario...
- A table of sales figures with a unique key based on Store ID and month
- An "org table" associating facilities with territories
- A user data table...associating specific users with territory numbers.
The goal with this was to provide only the set of sales figures related to a user's specific set of facilities, based on sales territory. This is provided with a view joining these tables together, with a bound variable tied to the user ID (set as a Data Subsetting Parameter in Mobile Manager).
With this configuration, we should get an entirely new set of sales figures whever we...
- load new territory assignments to the User Table
- load new organizational info into the Stores Table
- update the individual records in the Sales Figures table
And this also avoids a lot of administrative overhead in resetting Data Subsetting Parameters, since there are massive rates of change in territory assignments.
The problem I'm running into comes when defining the Published Item for this view. Mobile Databse Workbench still wants to define a "primary table" for the view, placing triggers on only one of the three tables. This means that synchronization/MGP flags are only being set when one of the tables is updated. I need them set whenever ANY of the constituent tables are updated.
Since even a subset of this data is massive, we want to stick to Fast Refresh, so refusing to set a Primary and forcing Complete Refresh is not an option.
Outside of forcibly de-normalizing our data into a single, messy, massive table (or huge de-normalized materialized view), how do I handle this? How do I get Oracle Lite to trigger Fast Refresh off of multiple constiuent tables from a join/view?

We use views a lot for data denormalisation as there can be client side performance issues when joining tables in msql (either direcly of via local views)
in order to create a view as a snapshot you WILL need to define a main base table as this is the source of the primary key. composite PKs from a number of tables will not work correctly as this causes problems in the out queue creation.
for your scenario, in the view you will need a unique primary key - this may determine which table you use as the base table. when published this will autmatically create the triggers for fast refresh on the base table. To get the triggers on the other tables in the view, you can include these tables manually in the publication as well, either with create on client=NO or with a dummy select clause (we use where 1=2). this will trigger the compose if any of the tables change.
There are a couple of issues
1) you will see when looking at the details of a published view object that the base table and all subsidiary tables are shown, but ONLY if directly referenced in the view itself. derived data via functions for example will not show the table, and therefore changes to these tables will not trigger the compose of the object
2) the out queue is only populated if the version number of the record is changed - this is associated with the base table ONLY. If you get the replication triggers on all of the tables as above, then any change to any table will trigger the compose, and if the nature of the change means that a new record is to be sent to the client, or one deleted, this will happen. HOWEVER if the nature of the change is just a change to data, the update will only be sent if the base table has altered.
in some cases in our system we have gone for a strategy like
view is based on table a, also includes data from tables b and c, and a function selecing data from table d
create and publish based on table a
create triggers in the base schema on tables b, c and d that in case of change do an update to the table a record that is associated.
This method means that changes to any of the tables cause a change to table a, and therefore all inserts, updates and deletes will be replicated.
an alternative is to create publication items for the view and also tables b, c and d
this will create <tablename>i,u and d on all of the tables
if you look at the triggers for table a, you will see that what it does is log a record in c$all_sid_logged_tables, and updates the version number in CVR$<table a>. if you copy this code to the corresponding <table b/c/d> triggers, this will 'fool' the mgp compose into processing the changes without the need for physical updates to the tables themselves

MGP compose postponed because of unprocessed data in the in_queue

Could anybody shed some light on what does this mean?
"MGP compose postponed for B010MRM because of unprocessed data in the in_queue"
Thanks in advance,
dliu
We saw this one in the "Moblile Manager" Data Synchronization > MGP Apply/Compose Cycles > MGP History Cycle >
"Compose Error:
java.lang.Exception: MGP compose postponed for B010MRM because of unprocessed data in the in_queue
     at oracle.lite.sync.Consolidator$O8Server.fastPush(Unknown Source)
     at oracle.lite.sync.MGP$MGPG.run(Unknown Source)
     at java.lang.Thread.run(Thread.java:534)"

Basically there was data sitting in the in queue for the particular user when thier turn came around for the compose cycle of the MGP.
If this is the case, there could be a conflict between the incoming data and the data that could be selected from the main server database for download. To prevent this the compose will not run for the user.
During the next MGP cycle the in queue data will be posted first (assuming no errors) and then the compose will run as normal for the user. This is a relatively normal situation where there is a lot of incoming traffic and continual compose processes.

Conditional start of MGP

Hi,
I have some questions about job scheduler and MGP process.
a) Is there a way to setup job to be run only during the nights, but not during the day?
b) Is there a way to start MGP process conditionally, for example, as soon as specific row is put into a specific table?
We have a batch job that nightly synchronizes main database with database used with mobileadmin. We would like to start MGP only after batch job has finished, but not while it's still running, otherwise mgp has to do same thing all over again. Is there a way to somehow setup/trigger MGP to start only on special condition?
Thank you in advance!

Dear Marc,
Thanks for quick answer and some great ideas. I really like the idea of running mgp manually from the command line after running our synchronization scripts. I will think about a way to automate it in future. The only thing that I don't like about it is the necessity to stop job scheduler.
Regarding question A) Unfortunately, I don't see here http://download.oracle.com/docs/cd/B14156_01/doc/B12262/html/newjob_bottom.gif any way to schedule the job to run only during the night :(

Auto Sync - Invokes synchronization

Hi All,
I am developing an application that would have AutoSync publication items in it. I was able to make out the setup of these properties of the publication items from the documentation of Oracle Lite.
I was successfully able to setup the Autosync publication and any record commit on the device was able to be propagated to the server as soon as the record is committed.
What I also could infer from the document is, the same way any record commit on the server and after MGP Compose phase, the records are synchronized to the client.
http://download.oracle.com/docs/cd/E12095_01/doc.10302/e12090/sync.htm#BCGJDCCD
But I could not get this happening. The records after they are modified are in the Out Queue, but donot get to the device until a normal manual sync or autosync of that table occurs from the device. Else the records are just there in the Out Queue and are not sent to the device. What I expect from the statements in the document is, after there are records in the Out Queue greater than the threshold value, the records should get synchronized to the client without the client having to initiate any synchronization.
If anyone had worked with this, could you please help me out on this.
TIA, Aravind

I used the MDK to configure the auto sync settings. I used the Mobile Database Workbench for this.
I had set the autosync rules at the publication level, as to "Synchronize if the out queue contains 1 or more modified records ". I was able to see the setting in the Mobile Manager screens also.
Since I had set up the rule only for the server side, the autosync agent does not show the last sync status. I had synchronized many times after setting up this rule and there are also extra metadata tables created on the device after this synchronization.

How can I synchronize all hotmail folders in Mac's "Mail"? (Not just Inbox)

I tried to synchronize my hotmail accounts in Mac's Mail but only those emails inside "Inbox" can be synchronized. No other folders under my hotmail can be synchronized. Is there any tools to solve this problem?

If you right click on a son in iTunes and click Get Info. Under the Sorting tab iyo can change how the songs is sorted in iTunes
Tips for using song and CD info to organize your music
You can edit information in the Info window to make it easier to find and sort items in your library. For example, you can:
Group individual movements on a classical CD into one work by indicating the name of the work (for example, “Piano concerto in A Minor, Op. 54”) in the Grouping field.
Group songs that are part of a compilation together in your library by clicking Details and selecting the checkbox next to “Album is a compilation of songs by various artists”.
Identify the individual artists on a tribute album in the Artist field, and type “various” in the Album Artist field.
Create your own genre category by clicking Details and typing the category in the Genre field.
Change the order in which tracks on a CD play by changing the numbers in the Track fields.
Create a Smart Playlist that includes only songs that are just the right speed for your workout by typing the number of beats per minute in the BPM field. For instructions, see Create a Smart Playlist.
Identify a movie as a music video (click the Options button, and choose Music Video from the Media Kind pop-up menu).
Identify an item that you imported from a CD as an audiobook, so it appears under Audiobooks instead of Music (click the Options button and choose Audiobook from the Media Kind pop-up menu). If you do this, iTunes also remembers your place in the audiobook.
Enter custom sorting criteria for an item. Select the item, choose File > Get Info, click Sorting, and enter the custom text.
Does the non-syncing songs play in iTunes on the computer?
is there anything different about the songs that do sync and those that do not? Like where they cam from? The format (Get Info>under the File tab).

How do I add my Hotmail account to my Mail app on my MacBook Pro so that it synchronize automatically ?

Hi guys, I'm new to Mac. I know that you can add email accounts likeHotmail into your Mail app so that you can view, edit, modify, create and delete your emails and folders, etc. The questions I have are (1) can I see all the emails I have not just in the inbox but all the other folders as well just like if I was logging on to Hotmail via Internet Explorer ? (2) what happens if I read some emails, delete or move some emails, create new emails and send or save in draft, create or delete folders, etc in the Mail app on my MacBook Pro, will this synchronize and reflect the same on my Hotmail account if I was to logging via Internet Explorer ? How about the other way ? If so, how do I set it up on my MacBook Pro to do this automatically ?
I know that this doesn't work with Hotmail accounts on my iPhone 4 via the Mail app. Everytime I read an email or delete an email on my Mail app, it does not synchronize or reflect the same on my live Hotmail account when I logging via Internet Explorer.
Any help, guidance or advise would be appreciated. Thanks.

Edit: never mind, I was using the wrong password

Hello, My iCal don't synchronize older events than two or three month ago. How can I do to synchronize all my schedule? In iTunes it's all right in Calendars. I don't put a cross in "synchronize event older than ....... days". Thanks for answer.

Hello, My iCal don't synchronize older events than two or three month ago. How can I do to synchronize all my schedule? In iTunes it's all right in Calendars. I don't put a cross in "synchronize event older than ....... days". Thanks for answer.

Just saw your post. Better late than never. You may want to
consider GameBrix.com, where you can create Flash based, casual
games using your web browser. No downloads are required. You can
create a game from scratch using a library of images, sounds and
game mechanics. You can also upload your own. The online script
editor will allow you to view and edit the ActionScripts associated
with each game mechanic. In short, a great way to ramp up on game
design and build your own game without investing a lot of $
upfront.
BTW I am associated with GameBrix so any feedback is
appreciated.

Error while scheduling Background Job for User/Role Full Synchronization

Hi all,
We have installed RAR 5.3 Component and uploaded the authorization data & established the connectors to the backend system.
We have performed all the post installation activities and everything is complete.
When we have scheduled User -Full Synchronization with the Back End system as a part of Post Installation Activity we are receiving the below error message
"Error while executing the Job:Cannot assign an empty string to host variable 2."
Also the VIEW LOG/ Terminate Job buttons are disabled in this screen.
Can somebody please help us in resolving the above issue
Thanks and Best Regards,
Srihari.K

Hi,
We are copy pasting the error log (Part as it is huge) below here. We could able to do Full Synch for Roles and also for Profiles. Only for User Synch we are getting this error and none of the users are sychronized to RAR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user WILSONA of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user WINDC of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user WLADICHJ of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user WUK of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user ZENGS of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: Update user ZHENGL of HL2-QAHR
Jan 13, 2009 12:34:27 AM com.virsa.cscext.dao.CSCDAO populateGenObjUser
INFO: All System Flag:false=====Last Batch Flag:true
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.bg.BatchRiskAnalysis loadUserData
INFO: @@@ User sync completed for params true: Syskey List is [HL2-QAHR]
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.bg.BgJob run
WARNING: *** Job Exception: Cannot assign an empty string to host variable 2.
com.sap.sql.log.OpenSQLException: Cannot assign an empty string to host variable 2.
     at com.sap.sql.log.Syslog.createAndLogOpenSQLException(Syslog.java:85)
     at com.sap.sql.log.Syslog.createAndLogOpenSQLException(Syslog.java:124)
     at com.sap.sql.types.VarcharResultColumn.setString(VarcharResultColumn.java:57)
     at com.sap.sql.jdbc.common.CommonPreparedStatement.setString(CommonPreparedStatement.java:511)
     at com.sap.engine.services.dbpool.wrappers.PreparedStatementWrapper.setString(PreparedStatementWrapper.java:355)
     at com.virsa.cscext.dao.CSCDAO.updateIgnoredUserData(CSCDAO.java:1388)
     at com.virsa.cscext.dao.CSCDAO.populateGenObjUser(CSCDAO.java:1169)
     at com.virsa.cc.xsys.bg.BatchRiskAnalysis.populateGenObj(BatchRiskAnalysis.java:868)
     at com.virsa.cc.xsys.bg.BatchRiskAnalysis.insertBAPIUserData(BatchRiskAnalysis.java:142)
     at com.virsa.cc.xsys.bg.BatchRiskAnalysis.loadUserData(BatchRiskAnalysis.java:390)
     at com.virsa.cc.xsys.bg.BatchRiskAnalysis.performBatchSyncAndAnalysis(BatchRiskAnalysis.java:1275)
     at com.virsa.cc.xsys.bg.BgJob.runJob(BgJob.java:402)
     at com.virsa.cc.xsys.bg.BgJob.run(BgJob.java:264)
     at com.virsa.cc.xsys.riskanalysis.AnalysisDaemonBgJob.scheduleJob(AnalysisDaemonBgJob.java:240)
     at com.virsa.cc.xsys.riskanalysis.AnalysisDaemonBgJob.start(AnalysisDaemonBgJob.java:80)
     at com.virsa.cc.comp.BgJobInvokerView.wdDoModifyView(BgJobInvokerView.java:436)
     at com.virsa.cc.comp.wdp.InternalBgJobInvokerView.wdDoModifyView(InternalBgJobInvokerView.java:1225)
     at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doModifyView(DelegatingView.java:78)
     at com.sap.tc.webdynpro.progmodel.view.View.modifyView(View.java:337)
     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.doModifyView(ClientComponent.java:481)
     at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doModifyView(WindowPhaseModel.java:551)
     at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:148)
     at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
     at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:319)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:713)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:666)
     at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:250)
     at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:46)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:102)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:172)
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.bg.BgJob setStatus
INFO: Job ID: 13 Status: Error
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.bg.BgJob updateJobHistory
FINEST: --- @@@@@@@@@@@ Updating the Job History -
2@@Msg is Error while executing the Job:Cannot assign an empty string to host variable 2.
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.bg.dao.BgJobHistoryDAO insert
INFO: -
Background Job History: job id=13, status=2, message=Error while executing the Job:Cannot assign an empty string to host variable 2.
Jan 13, 2009 12:34:27 AM com.virsa.cc.xsys.riskanalysis.AnalysisDaemonBgJob scheduleJob
INFO: -
Complted Job =>13----
Please let us know how to resolve this error
Thanks and Best Regards,
Srihari.K

CRM Genesys (G+ 7.5) addional fields during synchronization of call list.

Hello.
I have the requirement of sending additional fields to Genesys (G+ 7.5) during synchronization of call list.
Do you know if it is possible? I have searched for any documentation or similar topic and I haven't found any document.
Thank you in advanced.
JM

it can be done with the help of a system code 'sy-xcode'. it is initialised the time list is sorted so just keeping a check point, we can solve this problem.
Vishu Khandelwal

I can not synchronize data from the prelude livelog

I can not synchronize data from the prelude livelog apparently seems to be all right, more aprasenta the following message: The Open Clip does not support XMP.
The Prelude can not apply metadata in it.
please can someone help me

Hi -
When it comes to AVCHD footage, Prelude wants to leverage the complex folder structure in order to save metadata. If the file is just the *.MTS file and is not part of the original folder structure, Prelude will report it cannot write metadata to the file. You can transcode the *.MTS to another format and then add metadata.
We are looking at future solution for what we call "naked MTS file", but unfortunately that is not part of the currently released product version.
Michael

Business partners synchronization

Hi
We have FSCM configured with collections, disputes and Credit management. All 3 of them are active and working in production. We are migrating another business into existing implemented SAP FSCM.
In Existing implementation we have business partners created for every customer created in AR. All of them were numbered sequentially ranging within 8 digits (ranging from 20000000 to 89999999). We have activated customer master data synchronization and whenever a new customer is created a BP gets created automatically with the same number range (Customer to BP sync is activated with BP having same number range as in customer master but it is set as External numbering in BP numbering). We also had customer contact details created. Contact persons were also having BPs created internally (in background) for every contact person is created in AR. Contact person in AR doesn't need a number range but since BP needs a number, it was assigned to a series of number range starting from 00001 to 10,000 and they were set to internal number range. Customer contact persons were almost 8000 and all those internal numbers were used and created as business partners till 8000.
Since we are bringing new customers from new business we have customers whose numbers are under 10,000 as well. Since we wanted to keep the numbers same, I have to make adjustments to business partner number range and I have changed BP number range from 1 to ZZZZZZZZZ (and kept external) so that it can accept all number ranges from customers as is. However the new customers are still having issues as system cannot create new BP for new customer as numbers under 10,000 were already used in existing system.
Is there a way, I can delete all existing 10,000 business partners which were created as BP and re-use these numbers for new customers?
Can I overwrite all this data with new customer master data being created?
Can I delete the link between Customer & BP for existing ones?
If I can delete a link and overwrite new data, can they be linked to customer master which is needed?
Any suggestions or any ideas please?
Thanks
Aleem

Thanks for quick reply Mark.
We did not create new account group at customer master and we are creating customers in the same account group. However we had to adjust number range from ( 20000000 to 89999999) to (1 to 89999999). Due to this I had to adjust BP number range also from (20000000 to 89999999) to (1 to 89999999 or ZZZZZZZZ ). Customer creation was fine for new customers which were under 10,000 but business partner is conflicting with existing BPs which were created as contact person.
Since we are not using BP's for contact person in any place, they are of no use sitting as business partner and using the numbers. Hence I am trying to delete existing BPs which were under 10,000 to free up the numbers to re-use for new customers.
Any more suggestions please?

Podcast Synchronization of Ipod and Hard Drive

Hi,
I'm fairly new to the whole iTunes/iPod thingy, so this question might sound stupid, but what I wanna do is the following:
I've downloaded various podcast episodes of different podcasts to my hard drive. For some podcasts, I want to begin with the first episode and catch up with everything, and so I also downloaded those.
Now, my iPod has only limited memory space left, so I want to have the first episodes on my iPods to listen to them, and then gradually replace them with the next expisodes.
However, the synchronize option doesn't work here at all (or I'm too stupid to use it). And neither do I want to manually put the episodes on my iPod because this would be rather time-consuming.
First, I unticked the more recent episodes (those I don't want to listen to right now) in iTunes on my harddrive and figured, if I then click on sychronize (all), it would transfer all selected episodes. Well, that didn't work. It still put the deselected episodes on my iPod. Then I thought I would select certain podcasts and only synchronize those, but it still put all the deselected episodes for these podcasts on my iPod.
The options like "sychronize newest episodes" and similar ones don't work either.
So, for me, it would appear to be the very simplest solution to have a sychronize option like "synchronize all selected episodes" in the menu but no, there is none like this (I'm using iTunes 7). I have to admit I've only been introduced to the whole Apple / iTunes thingy because I got an iPod as a present and I have already found way too many things that are way too complicated and not practical, so this just seems to be another one of these issues. I would love if someone could prove me wrong and teach me how to accomplish what I described above without having to manually move around episodes every other day.
And another rather confusing thing: initially, I had set iTunes to download the latest episode for a given podcast after a refresh. Then, when I realized I wanted to start with the earlier episodes and save some memory space, I set it so it would do nothing. Now, however, it really does nothing. It doesn't even display when a new episode is available. For example, I had the latest episode of an extensive podcast series and deleted it in my iTunes because it took a lot of memory space. But now I don't even see this episode any longer. I'm sorry, I'm not good at describing problems but what I want is, I want to see a list of all available episodes that will be updated regularly but I don't want the latest episodes to be downloaded automatically.. how in the world can I do that?
Sorry for the long post, I'm just getting a bit frustrated after having spent half a day on trying to figure these seemingly simple issues out
Thanks a lot for any help!
iPod Nano Windows XP iTunes 7

You can delete songs from your iTunes/computer hard drive after transferring them to the iPod, and for this you need to set your iPod to manage the iPod content manually.
However, storing music on your iPod and nowhere else is an extremely risky option because when (and not if) there comes a time to restore your iPod, which is a very common fix for iPod problems, then all the music would be erased. If you no longer have the music in iTunes (or any other back up), then all that music would be lost.
At the very least back up your music to either cd or dvd before deleting it, particularly any purchased music/videos, as this would have to be bought again if it were lost. See this about backing up media.
How to back up your media in iTunes.
What if the iPod were lost/stolen/needed repair? Again, the music would lost. I strongly recommend a back up, and if computer hard drive space is in short supply, you should seriously consider an external hard drive. They are not expensive, and the cost is well worth it when compared to the loss of all your precious music.

Lightroom synchronization trying to drop all my photos

Hello,
I recently installed OSX LR4, and was happily using it for a couple days on an upgraded LR3 catalog, but now when I go to synchronize any folder it will say (for example):
Import new photos (252)
Removing missing photos from catalog (252)
If I click "Show Missing Photos", it shows all the photos, and if I go to "Show In Finder" they are all there and there seems to be no recently modified files or anything suspicious looking. If I go ahead with the synchronization, I lose all the metadata, settings, etc from the photos. I also tried opening the old catalog in LR3 and the same issue exists.
Why is Lightroom doing this? Any ideas how to get around it? File permissions maybe?
Thanks in advance for any help you guys can provide.

It seems related to http://forums.adobe.com/thread/608096
I am not using any special characters and haven't renamed any directories. When I try to create a new catalog, and then import the directory structure from the original, it seems to load up most of the metadata just fine, but in the "Folders" section, some of the subdirectories are shown as being all in lowercase when they aren't that way on the filesystem (e.g. LR shows "nex-5n", the filesystem shows "NEX-5N".
I'm scared of losing all the work I've done on this catalog

LR 2.0 Synchronization hangs

Is anybody else seeing this, hopefully with a solution or workaround?
When I try to synchronize some folders with more than around 120 files, LR shows the progress up to 25% or so in its titlebar, and then - nothing. The percent complete vanishes from the titlebar, and LR never finishes the sync. I left it running Synchronize Folder on a folder with just over 800 images (by its count in the folder panel) for over 8 hours today while I was out of the office, and it never finished even the "Import new photos(counting)" portion. Synchronizing individual sub-folders of that folder with 90-120 files works fine, completing each one in under a minute, but one with 128 files hangs.
Any tips, fixes, or workarounds greatly appreciated!
Jack

> When I try to synchronize some folders with more than around 120 files, LR
> shows the progress up to 25% or so in its titlebar, and then - nothing.
> The percent complete vanishes from the titlebar, and LR never finishes the
> sync. I left it running Synchronize Folder on a folder with just over 800
> images (by its count in the folder panel) for over 8 hours today while I
> was out of the office, and it never finished even the "Import new
> photos(counting)" portion. Synchronizing individual sub-folders of that
> folder with 90-120 files works fine, completing each one in under a
> minute, but one with 128 files hangs.
I discovered similar non-linear performance problems when generating
previews. The time to generate each preview increased as the number of
previews increased. With a small number of previews, LR 2 could generate
one preview per second. As the number of previews increased, the time to
generate a single preview increased to ten seconds per preview, and at
40,000 images, LR 2 could not generate even one preview in several hours.
After a week of trying to get it to work, I finally had to remove LR 2. I'm
waiting for the release that fixes these performance problems.
Best,
Christopher

MGP Synchronization

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