SQLite is a popular relational database management system that is widely used today. But unlike other database management systems, it is not a client-server database engine. It is even embedded in the final program. SQLite is widely supported by various browsers, operating systems, embedded systems and many other applications. If you want an open-source and embedded database program for local / client storage in application software, you must use SQLite.
Like other database programs, SQLite also creates a database file. Since it is an open source program, it does not use a specific file extension. Sometimes corruption can cause serious problems and compromise SQLite data. We all know that database files are very prone to corruption due to its large size and complicated file structure. Like any other file, the SQLite database file is not immune to corruption. There are several reasons that cause corruption and you need to know them. If you are aware of the most common reasons for corruption, you can take appropriate action to prevent it.
The file lock problem looks normal but can sometimes cause serious damage. SQLite uses a file locking system for the database file and the Write-Ahead Logging (WAL) file. The primary function of the file locking system is to coordinate access between concurrent processes. Sometimes two threads or processes can cause incompatible changes to a database file without proper coordination.
SQLite database is basically a regular disk file. This means that any process can easily open it and overwrite it with unwanted characters or make unwanted changes. Any bad thread or process can easily cause such an appropriate action, even the SQLite library cannot help you in this situation.
An error in the disk drive or flash memory can damage the SQLite database. This can cause changes or modifications in the file content and lead to corruption.
SQLite has many built-in protections that work against database corruption. But sometimes many of these protections are disabled due to configuration options. This results in corruption in SQLite database files.
Almost all programs have some internal bugs. The SQLite database program contains some minor bugs that can cause corruption.
Corruption makes the SQLite database inaccessible. In such a situation you have three options:
Valid backup for the database
Manual trick to fix SQLite database
Professional SQLite database recovery solution
If you have a valid backup, you can easily restore the SQLite database from it. But if you don’t have a backup then you should try to repair the SQLite database manually. If you are using the SQLite database browser, just follow these simple steps:
Step 1: Launch DB Browse to SQLite on your system. Click Run SQL tab to run the database check command.
Step 2: Type this command – PRAGMA integrity checkand click the play button.
Note: Since the database is corrupt, you will see an error message (s).
Step 3: So now you should try to export the database to an SQL file. Click File tab at the top > Export > Database to SQL file.
Step 4: On Export SQL dialog box, select the objects you want to export. You can also define other options.
Step 5: You can start the process by clicking OK. Wait for the process to complete.
Step 6: You can then import the database back into the SQLite browser. Click File tab at the top > Import > SQL file database.
You can now check your database. It’s fine now. Or if there is still corruption then you need to use a professional recovery solution. There are many software vendors on the market that offer such recovery solutions with a free demo / trial version. Generally, the demo / trial version is used for the free evaluation purpose. If you are using a demo / trial version, you can see what you can recover from the corrupt database file before actually paying for the software.