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From "Neil Harding (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-684) WebKit database restore on iOS5.1 corrupts large databases (not enough time for background execution)
Date Sat, 12 May 2012 07:52:10 GMT

    [ https://issues.apache.org/jira/browse/CB-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273880#comment-13273880
] 

Neil Harding commented on CB-684:
---------------------------------

Awesome, thanks for looking at this so quickly. Doing this in a background task sounds ideal,
I'm sure it should complete well within 10 mins. Looking forward to Cordova 1.8! 
                
> WebKit database restore on iOS5.1 corrupts large databases (not enough time for background
execution)
> -----------------------------------------------------------------------------------------------------
>
>                 Key: CB-684
>                 URL: https://issues.apache.org/jira/browse/CB-684
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: iOS
>    Affects Versions: 1.6.1
>         Environment: iOS5.1
>            Reporter: Neil Harding
>            Assignee: Shazron Abdullah
>            Priority: Critical
>              Labels: database, ios, sqlite, webkit
>             Fix For: 1.8.0
>
>
> The backup and restore process for WebKit databases on iOS5.1 to copy databases from
the /library/caches folder to /documents/backup is corrupting large databases. 
> I have a 1Gb sqllite databases, this is is because there will be a lot of data in the
app and to get around the 5mb quota limit for Websql databases on iOS a large pre populated
.db file is copied over to /library/caches on app start up in didFinishLaunchingWithOptions
if it doesn't already exist. This 'reserves' the footprint of the database as sqlite doesn't
unallocated space when deleting rows, the data is cleared out and the app can start off without
any quota errors.   
> When the app terminates and the backup process runs to copy the .db file to /documents/backup
it doesn't complete the process successfully (possibly killed by iOS before the file is fully
written?) and the resulting file .db is much smaller (~200mb) and corrupt.
> When the app runs next time the .db is copied from /documents/backup to /library/caches
ok, but the damage is already done.

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