How to prevent iPhoto from getting corrupted?

This is the second time in the last couple months where I've had to rebuild/repair my iPhoto library, i.e. I get prompted at iPhoto startup that the library cannot be read, with the suggestion to rebuild or repair my library by starting with Command + Option. While I've found plenty of links on how to rebuild/repair the library, my concern is that it's not addressing the root cause.
1. What are the reasons a library would be corrupt? Is it because the iPhoto database doesn't match with what's in the filesystem? If so, what specifically doesn't match - file permissions, file properties, etc.? Or, is it something with the filesystem itself that's corrupted, causing iPhoto to not be able to find a file(s)?
2. How can I prevent corruption in the future?
I was able to rebuild/repair or restore from Time Machine backup, but again, my concern is without knowing the root cause, I could be losing data and not realizing it, or even propagating errors in the Library.
I'm using OS X ver. 10.8.3. iPhoto 11, ver. 9.4.3 (720.91).

iPhoto is built around an SQL database. This db is liable to damage if it's interrupted while writing to the db. What can cause this? A crash or force quit are the most likely. Other possibiities: if the db is sitting on an inappropriately formatted disk, if the disk it's on is damaged and so on.
As you've had to rebuild/restore twice in a short space of time (by comparison, I've been using iPhoto since v1 and I've never had to) I would suspect that the fix isn't fixing and the damage is also present in the back up.
In your case I would make a new database and here's how to do it with the minimum interruption:
Download iPhoto Library Manager and use its rebuild function. (In Library Manager it's the FIle -> Rebuild command)
This will create an entirely new library. It will then copy (or try to) your photos and all the associated metadata and versions to this new Library, and arrange it as close as it can to what you had in the damaged Library. It does this based on information it finds in the iPhoto sharing mechanism - but that means that things not shared won't be there, so no slideshows, books or calendars, for instance - but it should get all your events, albums and keywords, faces and places back.
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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