Hi, Hopefully someone here can help where the android guys haven't been able to. We are having an issue with our sqlite database running on the android platform. We are accessing the db from the sdcard on an android phone running android 2.1.
It works perfectly 99% of the time, but every now and again, we get database corruption appear randomly. We have not changed any pragmas, so synchronous is set to full and journal_mode delete. It does not correspond to any power failures, or application crashes, and will succeed in pulling back data from the database for hundreds of calls, and then fail on a query that has worked many times before. It can occur in a number of native calls. We have performed integrity checks on the db in question and they return ok (prior to the corruption - androids response to a corrupt db is to delete it, so we can't see its state after corruption). The database in question is downloaded as a complete binary and then accessed read-only using android's rawQuery call. A couple of typical stack traces for when the corruption occurs: 03-26 14:09:50.572 E/DatabaseHelper( 1253): android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed: , while compiling: SELECT o.FieldId,o.Reference, o.Category, o.OIndex,o.Description, c.Choice, c.Derivative FROM Option o, Choice c WHERE o.FieldId = c.FieldId and o.Reference = ? ORDER BY o.Option, o.OIndex 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteProgram.native_compile(Native Method) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteProgram.compile(SQLiteProgram.java:110) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:49) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1221) 03-26 14:09:50.572 E/DatabaseHelper( 1253): at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1194) We can run the exact same query hundreds of times and it is fine. Then all of a sudden it fails. Another typical stack trace: 03-24 14:54:04.678 E/AsyncTask( 6828): RuntimeException while executing background thread 1045 03-24 14:54:04.678 E/AsyncTask( 6828): android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed 1046 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.sqlite.SQLiteQuery.native_fill_window(Native Method) 1047 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:75) 1048 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:288) 1049 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:269) 1050 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:171) 1051 03-24 14:54:04.678 E/AsyncTask( 6828): at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:248) The one above is while trying to move to the first row in a cursor. (android method native_fill_window source available here: http://www.netmite.com/android/mydroid/frameworks/base/core/jni/android_database_SQLiteQuery.cpp and native_compile http://www.netmite.com/android/mydroid/frameworks/base/core/jni/android_database_SQLiteProgram.cpp) We have been looking for some way we could be corrupting the database through incorrect use, however we are now out of options. We have triple checked we are opening and closing all cursors and connections correctly and checked there aren't multiple threads accessing the db at the same time and nothing seems out of the ordinary when corruption occurs. As all we are doing is reading the database, I really can't see how we can be corrupting it. I was wondering if anyone on this forum had experienced anything similar in the past, or could suggest things we could do to track down what is causing the corruption. From what I've read on the SQLite site this type of corruption should be all but impossible, however it is definitely happening. If you need any more information to help track down the problem, please let me know. Thanks in advance for any tips, or advice to help solve this. Cliff -- View this message in context: http://old.nabble.com/Android-database-corruption-tp28044218p28044218.html Sent from the SQLite mailing list archive at Nabble.com. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
