Should I rebuild the iPhoto library or restore from backup?

When I start iPhoto I get this message:
"Your iPhoto library is either in use by another application or has become unreadable"
Shut down and restart your computer, and then open iPhoto again. If the problem persists, try rebuilding your iPhoto library. To do this, quit iPhoto, and then reopen it while keeping the Option and Command keys pressed. You can also try restoring your photo library from a backup.
What do I do?  Which is best?
Robert

If the restart did not solve it, rebuild the library, but make a backup (don't overwrite any backup, that you have).
See Terence Devlin's post on how to rebuild here: 
Your photo library is either in use by another application or has become unreadable https://discussions.apple.com/message/16810380#16810380

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    Because this process creates an entirely new library and leaves your old one untouched, it is non-destructive, and if you're not happy with the results you can simply return to your old one.
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    I am trying to rebuild my iPhoto library and noticed my backup contains aliases (pointers?) and not the actual file. What's the best way to rebuild my library?
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    do you have a strongly recommended default "managed" library (the iPhoto preference to "copy imported items to the iPhoto library is in its checked state) or a referenced library - you have unchecked that option?
    It sounds like you have a referenced library and are now experiancing one of the very siginificant drawbacks of a referenced library and one of the many reasons they are strongly not recommended
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  • Trouble with rebuilding the iPhoto library

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    He told me about some issues with photos in his library, so I thought that maybe rebuilding the iPhoto library would fix them. Unfortunately I can't access the "rebuild" dialog and holding down Command and Option keys when opening iPhoto does nothing.
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    Yep! I know it doens't make any sense... I've tried repairing permissions and checking the file system, I've also deleted the content of "caches" folder but without any luck.
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  • My iPhoto closed unexpectedly and now it says "Rebuilding the iPhoto Library database". What is going on and are my photos still going to be there?

    My iPhoto closed unexpectedly and now it says "Rebuilding the iPhoto Library database". What is going on and are my photos still going to be there?

    With the amount of information you've provided it's impossible to offer a solution.  We can't see your computer so we need to know the details of your problem and setup, i.e.:
    what version of iPhoto are you using?
    what system version are you running?
    what were you doing when iPhoto closed unexpectedly?
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  • I just upgraded from IPhoto7 to 9.5. Now I can't open iPhoto without a downloaded tool to bridge the gap bewteen versions. I downloaded the tool and I still get the message "To prepare the library, use the iPhoto Library Upgrader available from Apple."

    I had to upgrade to Mavericks to send off the iCanendars I made in iPhoto. Then I had to upgrade my IPhoto from 7 to 9.5. Now when I go to open iPhoto I get the message "To prepare the library, use the iPhoto Library Upgrader available from Apple."  Well, I installed the Upgrader, but I still get the message and can't open iPhoto.  I have tried restarting the computer, but that didn't help.  How do I get the computer to recognize the Upgrader?

    You may get more replies in the iPhoto forum.
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  • HT1766 After restoring my iphone 4 to factory settings, then restoring from a recent backup, my phone will reboot but keeps coming back to the "new setup or restore from backup screen". How can I by-pass this screen to go directly to the sync apps/music s

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  • Rebuilding the iPhoto Library

    I messed up the iPhoto Library!
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    2.Where do my originals need to be for iPhoto to find them again?
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    On behalf of myself and Susan Pease: Can following the directions to rebulild the iPhoto library (by holding down the option and shift keys while opening iPhoto) result in a loss of the photos? Is there some precaution we should take to make sure that the photos are not lost?

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    Rebuild library.
    http://docs.info.apple.com/article.html?artnum=93313

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