Unable to open database file windows

Question: Why can’t I open the database?

Info: I’m working on a project using sqlite3 database. I wrote a test program that runs and passes it the database:

/tmp/cer/could.db

The unit test program can make the db without any problem. But, when I actually use the program passing the same location to it, i got below error:

OperationalError: unable to open database file

I’ve tried doing it with:

1) an empty database.
2) the database and the unit test left behind.
3) no database at all.

In three cases, I got the above error. The most frustrating part has to be the fact that the unittest can do it just fine, but the actual program can’t.

Any clues as to what on earth is going on?

shiva

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asked Jan 9, 2011 at 0:23

NarcolapserNarcolapser

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Primary diagnosis: SQLite is unable to open that file for some reason.

Checking the obvious reasons why, and in approximate order that I recommend checking:

Is the program running on the same machine as you’re testing it?
Is it running as you (or at least the same user as you’re testing it as)?
Is the disk containing /tmp full? (You’re on Unix, so use df /tmp to find out.)
Does the /tmp/cer directory have “odd” permissions? (SQLite needs to be able to create additional files in it in order to handle things like the commit log.)
Is the unit test code still using that database? (Concurrent opens are possible with a modern-enough SQLite and when in the right filesystem — though /tmp is virtually always on the right sort of FS so it’s probably not that — but it’s still not recommended.)
Is the development code really trying to write to that database, or is something “clever” catching you out and causing it to try to open something else? (I’ve been caught out by this in my code in the past; don’t think it can’t happen to you…)
Are you using the same version of the SQLite library in the unit tests and the production code?

If you’re not on the same machine, it’s quite possible that the production system doesn’t have a /tmp/cer directory. Obvious to fix that first. Similarly, if you’re on the same machine but running as different users, you’re likely to have permissions/ownership problems. Disk space is another serious gotcha, but less likely. I don’t think it’s the last three, but they’re worth checking if the more obvious deployment problems are sorted. If it’s none of the above, you’ve hit an exotic problem and will have to report much more info (it might even be a bug in SQLite, but knowing the developers of it, I believe that to be quite unlikely).

answered Jan 9, 2011 at 0:41

Donal FellowsDonal Fellows

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This worked for me:

conn = sqlite3.connect("C:\\users\\guest\\desktop\\example.db")

Note: Double slashes in the full path

Using python v2.7 on Win 7 enterprise and Win Xp Pro

Hope this helps someone.

answered Dec 26, 2011 at 18:38

On unix I got that error when using the ~ shortcut for the user directory.
Changing it to /home/user resolved the error.

answered Jul 11, 2017 at 16:02

JacquotJacquot

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One reason might be running the code in a path that doesn’t match with your specified path for the database. For example if in your code you have:

conn = lite.connect('folder_A/my_database.db')

And you run the code inside the folder_A or other places that doesn’t have a folder_A it will raise such error. The reason is that SQLite will create the database file if it doesn’t exist not the folder.

One other way for getting around this problem might be wrapping your connecting command in a try-except expression and creating the directory if it raises sqlite3.OperationalError.

from os import mkdir
import sqlite3 as lite

try:
    conn = lite.connect('folder_A/my_database.db')
except lite.OperationalError:
    mkdir('folder_A')
finally:
    conn = lite.connect('folder_A/my_database.db')

answered Apr 2, 2017 at 14:12

MazdakMazdak

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in my case, i tried creating the sqlite db in /tmp folder and from all the slashes i missed a single slash

Instead of sqlite:///tmp/mydb.sqlite -> sqlite:////tmp/mydb.sqlite …

answered Oct 5, 2020 at 12:21

Ricky LeviRicky Levi

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Ran into this issue while trying to create an index on a perfectly valid database. Turns out it will throw this error (in addition to other reasons described here) if the sqlite temp_store_directory variable/directory is unwritable.

Solution: change temp_store_directory with c.execute(f'PRAGMA temp_store_directory = "{writable_directory}"'). Note that this pragma is being deprecated and I am not yet sure what the replacement will be.

answered Nov 22, 2019 at 17:41

AlopexAlopex

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I faced the same problem on Windows 7. My database name was test and I got the error:

self.connection = Database.connect(**kwargs)
sqlite3.OperationalError: unable to open database file

I replaced test with test.db and and all went smooth.

answered Dec 14, 2013 at 15:54

FallenFallen

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The only thing you need to do is create the folder (as it doesn’t exist already), only the database file will be created by the program.
This really worked for me!

answered Mar 29, 2018 at 13:30

In my case, the solution was to use an absolute path, to find an existing file:

import os.path
filepath = os.path.abspath(filepath)
# Leave this out if the file doesn't exist yet
assert os.path.exists(filepath), "The file doesn't exist"
conn = sqlite3.connect(filepath)

I don’t know why this fix works: the path only contained ASCII characters and no spaces. Still it made the difference.

For reference: Windows 7, Python 3.6.5 (64-bit).

I was not able to reproduce the issue on another machine (also Windows 7, Python 3.6.4 64-bit), so I have no idea why this fix works.

answered Apr 15, 2018 at 21:42

pj.dewittepj.dewitte

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import sqlite3

connection = sqlite3.connect("d:\\pythonAPI\\data.db")
cursor = connection.cursor()
create_table = "CREATE TABLE users (id int, username text, password text)"
cursor.execute(create_table)

for clearer full path if you didn’t get it clear

fmw42

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answered Jun 24, 2018 at 22:15

This is definitely a permissions issue. If someone is getting this error on linux, make sure you’re running the command with sudo as the file most likely is owned by root. Hope that helps!

answered Oct 3, 2018 at 18:37

tzndrtzndr

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Use the fully classified name of database file

Use- /home/ankit/Desktop/DS/Week-7-MachineLearning/Week-7-MachineLearning/soccer/database.sqlite

instead-

answered Nov 29, 2018 at 12:15

If this happens randomly after correctly being able to access your database (and no settings have changed), it could be a result of a corrupted database.

I got this error after trying to write to my database from two processes at the same time and it must have corrupted my db.sqlite3 file.

My solution was to revert back to a previous commit before the corruption happened.

answered Aug 30, 2019 at 15:48

Run into the error on Windows, added assert os.path.exists, double checked the path, run the script as administrator, nothing helped.

Turns out if you add your folders to the Windows Defender’s Ransomware Protection, you can no longer use other programs to write there unless you add these programs to the Controlled Folder Access’ whitelist.

Solution — check if your folder has been added to the Windows Defender’s Ransomware Protection and remove it for faster fix.

answered Sep 19, 2019 at 9:02

TH TodorovTH Todorov

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Make sure you are not editing the settings.py file while trying to run syncdb, you will get the same error!!!

self.connection = Database.connect(**kwargs)
sqlite3.OperationalError: unable to open database file

Doug Porter

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answered Nov 23, 2011 at 20:59

1) Verify your database path,
check in your settings.py

DATABASES = {
    'default': {
        'CONN_MAX_AGE': 0,
        'ENGINE': 'django.db.backends.sqlite3',
        'HOST': 'localhost',
        'NAME': os.path.join(BASE_DIR, 'project.db'),
        'PASSWORD': '',
        'PORT': '',
        'USER':''

some times there wont be NAME’: os.path.join(BASE_DIR, ‘project.db’),

2)Be sure for the permission and ownership to destination folder

it worked for me,

answered Mar 15, 2019 at 3:33

My reason was very foolish.
I had dropped the manage.py onto the terminal so it was running using the full path.
And I had changed the name of the folder of the project.
So now, the program was unable to find the file with the previous data and hence the error.

Make sure you restart the software in such cases.

answered Sep 14, 2019 at 17:11

The DoctorThe Doctor

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For any one who has a problem with airflow linked to this issue.

In my case, I’ve initialized airflow in /root/airflow and run its scheduler as root. I used the run_as_user parameter to impersonate the web user while running task instances. However airflow was always failing to trigger my DAG with the following errors in logs:

sqlite3.OperationalError: unable to open database file
...
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unable to open database file

I also found once I triggered a DAG manually, a new airflow resource directory was automatically created under /home/web. I’m not clear about this behavior, but I make it work by removing the entire airflow resources from /root, reinitializing airflow database under /home/web and running the scheduler as web under:

[root@host ~]# rm -rf airflow
[web@host ~]$ airflow initdb
[web@host ~]$ airflow scheduler -D

If you want to try this approach, I may need to backup your data before doing anything.

answered Nov 15, 2019 at 22:08

micmiamicmia

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In case someone gets here again after being greeted by that error, the valid SQLite URL forms are any one of the following:

sqlite:///:memory: (or, sqlite://)
sqlite:///relative/path/to/file.db
sqlite:////absolute/path/to/file.db

answered Aug 9 at 12:25

Источник

The SQLite Error 14: ‘unable to open database file’ is a common error encountered when using Entity Framework (EF) Core with a Code First approach. This error occurs when the application is unable to access or open the database file specified in the connection string. There are a few methods to resolve this issue, and this article outlines the various solutions that can be used to resolve the SQLite Error 14: ‘unable to open database file’ error.

Method 1: Check the Connection String

To fix the SQLite Error 14: ‘unable to open database file’ with EF Core code first, you can check your connection string. Here is an example of how to do it:

Open the appsettings.json file in your project.
Locate the ConnectionStrings section and ensure that the DefaultConnection key has the correct value.
Ensure that the path to the database file is correct and that the file exists.
Ensure that the permissions on the file allow the application to read and write to it.

Here is an example of a connection string for SQLite:

"ConnectionStrings": {
  "DefaultConnection": "Data Source=mydatabase.db"
}

In this example, mydatabase.db is the name of the SQLite database file.

If you are using a relative path for the database file, ensure that it is relative to the application’s working directory.

Here is an example of a connection string for SQLite with a relative path:

"ConnectionStrings": {
  "DefaultConnection": "Data Source=|DataDirectory|mydatabase.db"
}

In this example, |DataDirectory| is a placeholder for the application’s working directory.

Ensure that the Microsoft.EntityFrameworkCore.Sqlite package is installed in your project.

Here is an example of how to configure the database context in your project:

public class MyDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite(Configuration.GetConnectionString("DefaultConnection"));
    }
}

In this example, MyDbContext is the name of the database context class.

Ensure that you have added a migration and updated the database.

Here is an example of how to add a migration and update the database:

dotnet ef migrations add InitialCreate
dotnet ef database update

In this example, InitialCreate is the name of the migration.

If you have followed these steps and are still experiencing the SQLite Error 14: ‘unable to open database file’, try using an absolute path for the database file.

Method 2: Ensure the SQLite Library is Installed

To fix the SQLite Error 14: ‘unable to open database file’ with EF Core code first, you can ensure that the SQLite library is installed. Here are the steps:

Install the SQLite library using NuGet package manager:

Install-Package Microsoft.EntityFrameworkCore.Sqlite

In your DbContext class, add the following code to configure the connection string:

protected override void OnConfiguring(DbContextOptionsBuilder options)
    => options.UseSqlite("Data Source=yourdatabase.db");

Make sure that the SQLite database file is located in the correct directory. You can specify the path to the database file in the connection string.
Ensure that the SQLite library is loaded before using it:

using System.Data.SQLite;

Finally, initialize the database by running the following code:

using (var context = new YourDbContext())
{
    context.Database.EnsureCreated();
}

This will create the database if it doesn’t exist and apply any pending migrations.

That’s it! With these steps, you should be able to fix the SQLite Error 14: ‘unable to open database file’ with EF Core code first.

Method 3: Grant Write Permissions to the Directory Containing the Database File

To grant write permissions to the directory containing the SQLite database file, you can follow these steps:

Navigate to the directory containing the SQLite database file.
Right-click on the directory and select «Properties».
Select the «Security» tab.
Click on the «Edit» button.
Click on the «Add» button.
Enter «IIS AppPool{YourAppPoolName}» in the «Enter the object names to select» field.
Click on the «Check Names» button to verify the name.
Click on the «OK» button.
Select the newly added user from the list and check the «Write» checkbox under the «Allow» column.
Click on the «OK» button to close the permissions dialog.

After granting write permissions to the directory containing the SQLite database file, you should be able to open the database file without encountering the «SQLite Error 14: unable to open database file» error.

Here’s an example of how to grant write permissions to the directory containing the SQLite database file in C#:

var directoryInfo = new DirectoryInfo("path/to/directory");
var security = directoryInfo.GetAccessControl();
var appPoolUser = new NTAccount("IIS AppPool\\{YourAppPoolName}");
var appPoolIdentity = appPoolUser.Translate(typeof(SecurityIdentifier));
var fileSystemRule = new FileSystemAccessRule(
    appPoolIdentity,
    FileSystemRights.Write,
    AccessControlType.Allow);
security.AddAccessRule(fileSystemRule);
directoryInfo.SetAccessControl(security);

In this example, we first get a DirectoryInfo instance for the directory containing the SQLite database file. We then get the current security settings for the directory using the GetAccessControl method. We create a new NTAccount instance for the IIS AppPool user associated with our application pool, and use the Translate method to get the corresponding SecurityIdentifier. We then create a new FileSystemAccessRule instance for the app pool identity, granting the Write permission, and set the AccessControlType to Allow. Finally, we add the new file system rule to the security settings using the AddAccessRule method, and update the directory’s security settings using the SetAccessControl method.

Method 4: Use a Full Path for the Database File in the Connection String

To fix the «Sqlite: how to fix SQLite Error 14: ‘unable to open database file’ with EF Core code first?» error with «Use a Full Path for the Database File in the Connection String», you can follow these steps:

First, make sure that the path to the database file is correct and that the file exists. You can use the File.Exists method to check if the file exists:

if (!File.Exists("path/to/database.db"))
{
    // Handle the error here
}

Next, use the full path to the database file in the connection string. You can use the Path.GetFullPath method to get the full path:

var connectionString = $"Data Source={Path.GetFullPath("path/to/database.db")}";

Finally, pass the connection string to the UseSqlite method when configuring your DbContext:

optionsBuilder.UseSqlite(connectionString);

Here’s the complete code:

using System.IO;
using Microsoft.EntityFrameworkCore;

public class MyDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        var connectionString = $"Data Source={Path.GetFullPath("path/to/database.db")}";
        optionsBuilder.UseSqlite(connectionString);
    }
}

With these steps, you should be able to fix the «Sqlite: how to fix SQLite Error 14: ‘unable to open database file’ with EF Core code first?» error with «Use a Full Path for the Database File in the Connection String».

Method 5: Re-Create the Database File

If you encounter the SQLite Error 14: ‘unable to open database file’ with EF Core code first, one way to fix it is to re-create the database file. Here’s how you can do it:

First, make sure that your connection string is correct and that the path to the database file is valid. You can check this by using the File.Exists method to see if the file exists:

string connectionString = "Data Source=path/to/database.db";
if (!File.Exists(connectionString))
{
    // handle error
}

If the file does not exist, you can create it using the SQLiteConnection.CreateFile method:

SQLiteConnection.CreateFile(connectionString);

Next, you can create the database schema using EF Core’s Database.EnsureCreated method:

using (var context = new MyDbContext(connectionString))
{
    context.Database.EnsureCreated();
}

Finally, you can seed the database with initial data using EF Core’s DbContext.Seed method:

using (var context = new MyDbContext(connectionString))
{
    context.Seed();
}

Here’s the complete code example:

string connectionString = "Data Source=path/to/database.db";
if (!File.Exists(connectionString))
{
    SQLiteConnection.CreateFile(connectionString);
}

using (var context = new MyDbContext(connectionString))
{
    context.Database.EnsureCreated();
    context.Seed();
}

Note that MyDbContext is your EF Core DbContext class, and Seed is a method that you can implement to seed the database with initial data.

By following these steps, you should be able to re-create the database file and fix the SQLite Error 14: ‘unable to open database file’ with EF Core code first.

Источник

Вопрос: Почему я не могу открыть базу данных?

Информация: Я работаю над проектом, цель которого не важна, но использует базу данных sqlite3. Я сделал тестовую программу, которая запускает и передает ей местоположение для создания базы данных:

/tmp/cer/could.db

а программа unit test может сделать db без проблем. Затем я фактически использую программу, передавая ей одно и то же место, и он говорит

OperationalError: невозможно открыть файл базы данных

Я пытался сделать это с пустой базой данных. с базой данных unit test, оставленной позади, и без базы данных вообще. во всех трех случаях я получаю эту ошибку. Самая неприятная часть должна состоять в том, что unit test может сделать это просто отлично, но фактическая программа не может.

Любые подсказки о том, что происходит на Земле?

Ответ 1

Первичный диагноз: SQLite не может открыть этот файл по какой-либо причине.

Проверка очевидных причин, почему и в примерном порядке, который я рекомендую проверить:

Работает ли программа на том же компьютере, что и вы ее тестируете?
Он работает как вы (или, по крайней мере, тот же пользователь, что и вы его тестируете)?
Полный диск, содержащий /tmp? (Вы находитесь в Unix, поэтому используйте df /tmp, чтобы узнать.)
Имеет ли каталог /tmp/cer «нечетные» разрешения? (SQLite должен иметь возможность создавать в нем дополнительные файлы, чтобы обрабатывать такие вещи, как журнал фиксации.)
Является ли код unit test все еще использующим эту базу данных? (Параллельные открытия возможны с помощью современного SQLite и в правильной файловой системе, хотя /tmp практически всегда находится в правильном порядке FS, поэтому он, вероятно, не тот, но он по-прежнему не рекомендуется.)
Является ли код разработки действительно попыткой писать в эту базу данных или что-то «умное» ловит вас и заставляет его пытаться открыть что-то еще? (Я был пойман этим в моем коде в прошлом, не думаю, что это не может случиться с вами…)
Используете ли вы ту же версию библиотеки SQLite в модульных тестах и производственный код?

Если вы не на одной машине, вполне возможно, что в производственной системе нет каталога /tmp/cer. Очевидно, чтобы это исправить. Точно так же, если вы находитесь на одной машине, но работаете как разные пользователи, у вас могут возникнуть проблемы с правами/правами собственности. Дисковое пространство — еще одна серьезная проблема, но менее вероятно. Я не думаю, что это последние три, но стоит проверить, отсортированы ли более очевидные проблемы с развертыванием. Если это не так, вы столкнулись с экзотической проблемой и должны будете сообщить гораздо больше информации (это может быть даже ошибкой в SQLite, но, зная разработчиков, я считаю, что это маловероятно).

Ответ 2

Это сработало для меня:

conn = sqlite3.connect("C:\\users\\guest\\desktop\\example.db")

Примечание. Двойные слэши в полном пути

Использование python v2.7 для Win 7 Enterprise и Win Xp Pro

Надеюсь, это поможет кому-то.

Ответ 3

В unix я получил эту ошибку при использовании ярлыка ~ для каталога пользователя.
Изменение его на /home/user разрешило ошибку.

Ответ 4

Одной из причин может быть запуск кода в пути, который не соответствует указанному пути для базы данных. Например, если в вашем коде есть:

conn = lite.connect('folder_A/my_database.db')

И вы запустите код внутри folder_A или других мест, у которых нет folder_A, он вызовет такую ошибку. Причина в том, что SQLite создаст файл базы данных, если он не существует, а не в папке.

Другим способом обойти эту проблему может быть объединение вашей команды соединения в выражении try-except и создание каталога, если оно вызывает sqlite3.OperationalError.

from os import mkdir
импортировать sqlite3 как lite

try:
    conn = lite.connect('folder_A/my_database.db')
except lite.OperationalError:
    mkdir('folder_A')
finally:
    conn = lite.connect('folder_A/my_database.db')

Ответ 5

Убедитесь, что вы не редактируете файл settings.py при попытке запустить syncdb, вы получите ту же ошибку!!!

self.connection = Database.connect(**kwargs)
sqlite3.OperationalError: unable to open database file

Ответ 6

Я столкнулся с той же проблемой в Windows 7. Мое имя базы данных было test, и я получил ошибку:

self.connection = Database.connect(**kwargs)
sqlite3.OperationalError: unable to open database file

Я заменил test на test.db, и все прошло гладко.

Ответ 7

1) Проверьте путь к вашей базе данных,
проверьте в вашем settings.py

DATABASES = {
    'default': {
        'CONN_MAX_AGE': 0,
        'ENGINE': 'django.db.backends.sqlite3',
        'HOST': 'localhost',
        'NAME': os.path.join(BASE_DIR, 'project.db'),
        'PASSWORD': '',
        'PORT': '',
        'USER':''

иногда не будет NAME ‘: os.path.join(BASE_DIR,’ project.db ‘),

2) Убедитесь в разрешении и праве собственности на папку назначения

это сработало для меня,

Ответ 8

Единственное, что вам нужно сделать, это создать папку (так как она еще не существует), программа создаст только файл базы данных.
Это действительно сработало для меня!

Ответ 9

В моем случае решение было использовать абсолютный путь, чтобы найти существующий файл:

import os.path
filepath = os.path.abspath(filepath)
# Leave this out if the file does not exist yet
assert os.path.exists(filepath), "The file does not exist"
conn = sqlite3.connect(filepath)

Я не знаю, почему это исправление работает: путь содержал только символы ASCII и без пробелов. Тем не менее, это имело значение.

Для справки: Windows 7, Python 3.6.5 (64-разрядная версия).

Мне не удалось воспроизвести проблему на другом компьютере (также Windows 7, Python 3.6.4 64-bit), поэтому я понятия не имею, почему это исправление работает.

Ответ 10

import sqlite3

connection = sqlite3.connect("d:\\pythonAPI\\data.db")
cursor = connection.cursor()
create_table = "CREATE TABLE users (id int, username text, password text)"
cursor.execute(create_table)

для более ясного полного пути, если вы не поняли его

Ответ 11

Это определенно проблема с разрешениями. Если кто-то получает эту ошибку в Linux, убедитесь, что вы запускаете команду с sudo, поскольку файл, скорее всего, принадлежит пользователю root. Надеюсь, это поможет!

Ответ 12

Используйте полностью классифицированное имя файла базы данных

Use-/home/ankit/Desktop/DS/Week-7-MachineLearning/Week-7-MachineLearning/soccer/database.sqlite

instead-

Ответ 13

Если это происходит случайным образом после правильного доступа к вашей базе данных (и никакие настройки не изменились), это может быть результатом поврежденной базы данных.

Я получил эту ошибку после попытки записи в базу данных из двух процессов одновременно, и она, должно быть, повредила мой файл db.sqlite3.

Мое решение состояло в том, чтобы вернуться к предыдущей фиксации до того, как произошло повреждение.

Ответ 14

Моя причина была очень глупой.
Я поместил файл manage.py на терминал, чтобы он работал по полному пути.
И я изменил название папки проекта.
Поэтому теперь программе не удалось найти файл с предыдущими данными и, следовательно, с ошибкой.

Убедитесь, что вы перезапустите программное обеспечение в таких случаях.

Ответ 15

Запустил ошибку в Windows, добавил assert os.path.exists, дважды проверил путь, запустил скрипт от имени администратора, ничего не помогло.

Оказывается, если вы добавите свои папки в Защиту вымогателя Windows Defender, вы больше не сможете использовать для записи другие программы, если вы не добавите эти программы в белый список доступа к контролируемым папкам.

Решение — проверьте, была ли ваша папка добавлена в Защиту вымогателей Windows Defender, и удалите ее для более быстрого исправления.

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SQLite

Raj |
Modified: April 13th, 2022 | 4 Minutes Reading

Summary: In this blog we will discuss about SQLite unable to open database file error. Know the prevention checklist with automated solution to fix the issue.

If SQLite is unable to open the database file, this means that the SQLite database you are trying to open is corrupted. There are various causes of corruption, such as file overwrite issues, file locking issues, database synchronization failures, storage media failures, and many more. If the SQLite database is corrupted, it needs repair.

Whenever the SQLite database goes into an accessible state, it means the file is corrupted. All you have to do here is to repair your SQLite database or retrieve your SQLite data. Do you know why this happens? If the process fails during the transaction for some reason, the actual action will automatically be rolled back and you will have to start again. Due to the corruption, you may receive an error message such as the following:

In PHP
“SQLSTATE: General error: 14 unable to open database file.”
In Python
“SQLite3: OperationalError: unable to open database file.”

Prevention Checklist to Fix SQLite Unable to Open Database Issue

Prevention of the SQLite database is always better than repairing. First, try to attempt the following checklist to fix the database inaccessible issue:

Make sure Apache can write to the database’s parent directory.

Make sure that the folder does not start with the full path to the database files with a number.

Check the full path containing the db directory.

Make sure that the /tmp directory is globally writable.

Make sure that the path to the database specified in settings.py is a complete path.

Make sure there are no special characters in the path.

On Windows, make sure the db directory path is written with double backslash.

Common Causes of SQLite Database Inaccessible Issue

When SQLite database is corrupted, it becomes inaccessible at any time. Before explaining how to repair SQLite database, let’s discuss the most common causes of SQLite database file corruption.

1. The Problem of Overwriting
You can overwrite the SQLite database file because it is a regular disk file. There is no way to protect your SQLite database from such overwrites. There can be some serious problems, including Running file descriptor, Restoration while a transaction is in running mode and Deletion of a Hot journal.

2. File Locking Problem
SQLite provides the ability to lock SQLite database files. Unnecessary changes caused by two different processes to the SQLite database can result in data corruption. To avoid this, only lock the SQLite database. On the other hand, if the function is convenient for the user, it can cause serious problems. These are Missing lock details, POSIX advisory lock cancellation, The contradiction of two different protocols, Numerous links to a file and Rename or unlink database.

3. Database Synchronization Failure
SQLite database sync command operates real sync. That’s what. But if it acts as an I / O barrier, you may face obstacles that will allow you to roll back the action further. This puts the SQLite database in passive mode as it can override ACID properties (Atomicity, Consistency, Isolation, Durability).

4. Storage Media Failure
If something goes wrong with your storage media devices, such as your system’s hard disk or flash memory, the SQLite database can be corrupted. Unsolicited changes to the content of the storage media can cause serious problems for SQLite users. Make sure you have enough storage space on the disk so you can write more details. However, if you do not have space to store data and try to write something to it, your SQLite database may be corrupted.

SQLite Database Recovery to Open Damaged Database File

SQLite Database Recovery software provides a simple, fast, and efficient solution to repair damaged SQLite .db files without changing the original data. With this tool, you can restore important database objects such as tables, indexes, views, triggers from a corrupted SQLite database.

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Conclusion

We discussed all the possible reasons for SQLite unable to open database file issue. Suggested prevention checklist and automated solution to solve the problem. Choose wisely because the SQLite database has the most crucial information.

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(Windows 10 x64 ver 10.0.18362)
I always get this error from b2. Clean Python install, and I have also tried with only miniconda installed (no difference).

>python --version
Python 3.7.4

>b2
Traceback (most recent call last):
  File "c:\programdata\miniconda3\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\programdata\miniconda3\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\ProgramData\Miniconda3\Scripts\b2.exe\__main__.py", line 9, in <module>
  File "c:\programdata\miniconda3\lib\site-packages\b2\console_tool.py", line 1481, in main
    info = SqliteAccountInfo()
  File "c:\programdata\miniconda3\lib\site-packages\b2sdk\account_info\sqlite_account_info.py", line 52, in __init__
    self._validate_database()
  File "c:\programdata\miniconda3\lib\site-packages\b2sdk\account_info\sqlite_account_info.py", line 64, in _validate_database
    self._create_database(last_upgrade_to_run)
  File "c:\programdata\miniconda3\lib\site-packages\b2sdk\account_info\sqlite_account_info.py", line 126, in _create_database
    conn = self._connect()
  File "c:\programdata\miniconda3\lib\site-packages\b2sdk\account_info\sqlite_account_info.py", line 118, in _connect
    return sqlite3.connect(self.filename, isolation_level='EXCLUSIVE')
sqlite3.OperationalError: unable to open database file

Here’s the installation:

(base) C:\Users\Matt>pip install --upgrade b2
Collecting b2
  Using cached https://files.pythonhosted.org/packages/90/b6/71ec542b76ea5a282dd2c2fb6f8427d90e3397e5db59593510667f14f236/b2-1.4.0.tar.gz
Collecting b2sdk<0.2.0,>=0.1.6 (from b2)
  Using cached https://files.pythonhosted.org/packages/ea/2e/bd06b7250d936b8cf502d44c789e90cb4837dd9c9242ed88e9a2bc30bb05/b2sdk-0.1.8.tar.gz
Requirement already satisfied, skipping upgrade: six>=1.10 in c:\programdata\miniconda3\lib\site-packages (from b2) (1.12.0)
Requirement already satisfied, skipping upgrade: tqdm>=4.5.0 in c:\programdata\miniconda3\lib\site-packages (from b2) (4.32.1)
Collecting arrow<0.13.1,>=0.8.0 (from b2sdk<0.2.0,>=0.1.6->b2)
  Using cached https://files.pythonhosted.org/packages/5d/c7/468bb95a10fb8ddb5f3f80e1aef06b78f64d6e5df958c39672f80581381f/arrow-0.13.0.tar.gz
Collecting logfury>=0.1.2 (from b2sdk<0.2.0,>=0.1.6->b2)
  Using cached https://files.pythonhosted.org/packages/55/71/c70df1ef41721b554c91982ebde423a5cf594261aa5132e39ade9196fa3b/logfury-0.1.2-py2.py3-none-any.whl
Requirement already satisfied, skipping upgrade: requests>=2.9.1 in c:\programdata\miniconda3\lib\site-packages (from b2sdk<0.2.0,>=0.1.6->b2) (2.22.0)
Requirement already satisfied, skipping upgrade: setuptools in c:\programdata\miniconda3\lib\site-packages (from b2sdk<0.2.0,>=0.1.6->b2) (41.0.1)
Collecting python-dateutil (from arrow<0.13.1,>=0.8.0->b2sdk<0.2.0,>=0.1.6->b2)
  Using cached https://files.pythonhosted.org/packages/41/17/c62faccbfbd163c7f57f3844689e3a78bae1f403648a6afb1d0866d87fbb/python_dateutil-2.8.0-py2.py3-none-any.whl
Collecting funcsigs (from logfury>=0.1.2->b2sdk<0.2.0,>=0.1.6->b2)
  Using cached https://files.pythonhosted.org/packages/69/cb/f5be453359271714c01b9bd06126eaf2e368f1fddfff30818754b5ac2328/funcsigs-1.0.2-py2.py3-none-any.whl
Requirement already satisfied, skipping upgrade: certifi>=2017.4.17 in c:\programdata\miniconda3\lib\site-packages (from requests>=2.9.1->b2sdk<0.2.0,>=0.1.6->b2) (2019.6.16)
Requirement already satisfied, skipping upgrade: idna<2.9,>=2.5 in c:\programdata\miniconda3\lib\site-packages (from requests>=2.9.1->b2sdk<0.2.0,>=0.1.6->b2) (2.8)
Requirement already satisfied, skipping upgrade: chardet<3.1.0,>=3.0.2 in c:\programdata\miniconda3\lib\site-packages (from requests>=2.9.1->b2sdk<0.2.0,>=0.1.6->b2) (3.0.4)
Requirement already satisfied, skipping upgrade: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in c:\programdata\miniconda3\lib\site-packages (from requests>=2.9.1->b2sdk<0.2.0,>=0.1.6->b2) (1.24.2)
Building wheels for collected packages: b2, b2sdk, arrow
  Building wheel for b2 (setup.py) ... done
  Stored in directory: C:\Users\Matt\AppData\Local\pip\Cache\wheels\cd\10\35\2e308a35e697646c97fbd94907cd516b8a8ed1a4824a3d66e4
  Building wheel for b2sdk (setup.py) ... done
  Stored in directory: C:\Users\Matt\AppData\Local\pip\Cache\wheels\76\97\23\8ed305eb1c80e4b7d4e507155037cdcde012edf78fffe39d12
  Building wheel for arrow (setup.py) ... done
  Stored in directory: C:\Users\Matt\AppData\Local\pip\Cache\wheels\1e\d5\30\cace6155de216c74f70b1b866ce6ec2c9bbc60be88073a1fcd
Successfully built b2 b2sdk arrow
Installing collected packages: python-dateutil, arrow, funcsigs, logfury, b2sdk, b2
Successfully installed arrow-0.13.0 b2-1.4.0 b2sdk-0.1.8 funcsigs-1.0.2 logfury-0.1.2 python-dateutil-2.8.0

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