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POandroid.database.CursorWindowAllocationException: Cursor window allocation of 2048 kb failed even after closing cursor
 

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  1. POandroid.database.CursorWindowAllocationException: Cursor window allocation of 2048 kb failed even after closing cursor
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    <p>There are many questions on SO about CursorWindowAllocatoinException:</p> <ul> <li><a href="https://stackoverflow.com/questions/11340257/sqlite-android-database-cursor-window-allocation-of-2048-kb-failed">SQLite Android Database Cursor window allocation of 2048 kb failed</a></li> <li><a href="https://stackoverflow.com/questions/17495713/could-not-allocate-cursorwindow">Could not allocate CursorWindow</a></li> <li><a href="https://stackoverflow.com/questions/12577400/out-of-memory-when-allocating-cursors">Out of Memory when allocating cursors</a></li> <li><a href="https://stackoverflow.com/questions/12029437/android-mysqlite-cursorwindowallocationexception-crash">Android SQLite CursorWindowAllocationException crash</a></li> </ul> <p>All of them suggest that cursor must be closed after use. But that did not resolve my problem. Here is my code:</p> <pre><code>String query = "select serial from tbl1 union select serial from tbl2 union select serial from tbl3"; SQLiteDatabase db = null; Cursor cur = null; try { SettingsDatabaseHelper dal = new SettingsDatabaseHelper( c); db = dal.getReadableDatabase(); cur = db.rawQuery(query, null); int numRows = cur.getCount(); if (numRows &gt; 0) { cur.moveToFirst(); int serialIdx = cur.getColumnIndexOrThrow("serial"); for (boolean hasItem = cur.moveToFirst(); hasItem; hasItem = cur .moveToNext()) { String serial = cur.getString(serialIdx); if (Validator.getInstance().isValidSerial(serial)) serials.add(serial); } } } finally { if (cur != null) cur.close(); if (db != null) db.close(); } </code></pre> <p>I run this method every few seconds. After half an hour, I get <code>CursorWindowAllocationException</code> in <code>int numRows=cur.getCount();</code> and then my service stops. </p> <p>Since I am closing the cursor, there may be a problem with my Helper class. Here is the code:</p> <pre><code>public class SettingsDatabaseHelper extends SQLiteOpenHelper { private static final String DATABASE_NAME = "mydb.db"; private static final int DATABASE_VERSION = 1; private static final String TBL_CREATE="create table..."; public SettingsDatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase database) { database.execSQL(TBL_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { onCreate(db); } } </code></pre> <p>How can I prevent this exception from being thrown?</p>
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