January 17th, 2020
September 8, 2022
Have you stumbled upon the “SQLite database is locked error code 5”? While performing a query, a user may encounter an Error where the database is locked.
Read the article to know the common causes of why this error occurs and the possible fixes. SQLite is a simple RDBMS(Relational Database Management System) in the C library. It is not a client-server database engine, unlike other Database Management Systems.
The error occurs mainly when a user executes two inappropriate transactions in any database against the same connection.
This Error message communicates that an identical process can’t complete due to conflict with the transaction utilizing the same database connection or a separate database connection working on a shared cache.
Being a lightweight database, SQLite can’t handle a high level of concurrency.
Here are a few such instances:
One of the best ways to resolve this error is to create a database backup having no locks on it and replace the original with its backup copy.
Note: Here x.Sqlite is the database file.
Sqlite> .backup main backup .Sqlite
Now in the same directory, save the file backup. Here we are replacing the old locked up database file with the new unlocked copy of it. As the new file isn’t locked up, so the SQLite Database is locked code 5 is no longer there.
Whenever we attempt to make the database handle concurrency more than the default configuration, we face an error.
In this case, rewriting a more efficient version of the code statement can help solve the error and unlock the database.
If a transaction takes more time to execute, it can prevent other threads from accessing the database, thus creating a deadlock. (A scenario in which each thread is waiting for a resource while holding a resource needed by the other thread)
To resolve this issue, SQLite has a lock time out. If it finds out that a thread has been waiting for a lock for more than the default time of 5 seconds, the process terminates, and we face the dreaded SQLite DB is locked error.
To fix this error, you can increase the timeout value from the timeout database option.
The manual methods are a bit tricky to follow through and sometimes may fail to fix the issue entirely. A user may also face data loss/corruption if some difficulty occurs.
So we use the alternative automated solution via SQLite Database Recovery Software. That will help users to Restore SQL Database with a Different Name
Using a Recovery Software has other added advantages too, which help in the long run.
I see you’ve made it to the end of the article. You can go through these fixes one by one to see which one works out.
After you know why the “SQLite database is locked code 5” error occurs with the causes and fix using the manual method as well as using an SQLite Database Recovery Tool. It’s smarter to go for a recovery tool as you can use it as many times as you want in the future too.