我陷入了独特的境地。在我的应用程序中，我有本地数据库。不知何故，其中一个表填满了垃圾数据，数据库变得非常庞大。当我知道时，大小超过1 GB。所以我继续获得数据库锁定异常，因为读取该表上的垃圾行非常慢。调试之后，我弄清楚它是哪个表，现在我想删除它（删除整个表或删除所有行）但每当我对该表执行任何操作时，数据库都会被锁定并发生ANR。所以我不确定如何摆脱那张桌子。我无法卸载应用。
请注意，我在我的Android应用中使用了GreenDao。
我试过了以下事情
1) DROP TABLE mytable;
2) DELETE FROM mytable;
3) DaoSession.getMyDao().deleteAll(); // this is a greedao method but it internally performs 2nd query I mentioned I think
在所有情况下。它只是生成ANR.and数据库被锁定。
编辑：我也在单独的线程中尝试过它，它只是避免了ANR，但没有删除表，数据库仍然被锁定。
锁定之后，每当其他线程试图写入db时，我就会得到这个，这很明显。
E/SQLiteDatabase: Failed to open database '/data/user/0/myapp/databases/mydb.db'.
android.database.sqlite.SQLiteDatabaseLockedException: database is locked (code 5): , while compiling: PRAGMA journal_mode
#################################################################
Error Code : 5 (SQLITE_BUSY)
Caused By : The database file is locked.
(database is locked (code 5): , while compiling: PRAGMA journal_mode)
#################################################################
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1000)
at android.database.sqlite.SQLiteConnection.executeForString(SQLiteConnection.java:704)
at android.database.sqlite.SQLiteConnection.setJournalMode(SQLiteConnection.java:385)
at android.database.sqlite.SQLiteConnection.setWalModeFromConfiguration(SQLiteConnection.java:359)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:248)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:199)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:514)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:206)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:178)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:934)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:895)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:708)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:646)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:283)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:223)
at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187)
at com.intouchapp.database.IntouchDb.getNewReadableDaoSesssion(IntouchDb.java:80)
at com.intouchapp.models.ActivityLogsDb.getCursorOfAllResults(ActivityLogsDb.java:298)
at com.intouchapp.services.ActivityLogsDbInsertionService.onHandleIntent(ActivityLogsDbInsertionService.java:73)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:66)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.os.HandlerThread.run(HandlerThread.java:61)
我也是这样，
The connection pool for database '+data+user+0+myapp+databases+mydb' has been unable to grant a connection to thread 2262 (SyncAdapterThread-1) with flags 0x2 for 12.0060005 seconds.
Connections: 1 active, 0 idle, 0 available.
Requests in progress:
executeForChangedRowCount started 12645ms ago - running, sql="DELETE FROM 'mytable'"
这清楚地表明它无法执行"DELETE FROM 'mytable'"此特定查询因此锁定。
答案 0 :(得分：0)
SQLite在用于编写操作时锁定数据库。 您应该注意以下几点： -