Written By Pallavi
Updated on February 7th, 2020
SQLite is a relational database management system which is contained in a C library. Rather being a client-server database engine, it is embedded into the end-program which makes it fast and contrast to many other database systems.
Whenever we try to develop an application with SQLite, sometimes we get an error SQLite Database is Locked. In this blog, you will find all possible solutions to resolve this issue.
This error occurs whenever an SQLite user performs two inappropriate transactions or operations in a database on the same data connection.
The error message indicates that a similar operation can not be performed as there is an encounter with the transaction using the same database connection or a different database connection using a shared cache.
Different scenarios in which one can encounter this error are given below:
It becomes really annoying whenever this SQLite_locked error occurs but using some of the mentioned methods, you can easily unlock the SQLite database.
To remove the error code 5 from the SQLite database, the best way is to create a backup of the database having no locks. After creating backup, just replace the original one with the backup copy. After that execute the below script to do so:
Note- Here, db.SQLite is meant to be an SQLite database file.
Sqlite> .backup main backup.Sqlite
In the same directory, you will get the newly created backup file. Now swap the old file with this new file and execute the further script.
$mv .db.SQLite old.Sqlite
$mv backup.Sqlite .db.Sqlite
After the execution of the above script just check that the database is open allowing for both Read and Write. Then delete the old database file and you are good to go.
SQLite is a “lite” database for real-world implementation. Whenever we try to make the database handle concurrency more than the default configuration, you can get errors. Therefore, rewriting the code for reducing concurrency can help to unlock the SQLite Database. By doing so you can also ensure that the transactions are not long-lived.
If a transaction takes too much time then it can block the other threads from accessing the database. In the worst-case scenario, several threads can deadlock while waiting for each other’s completion. For this issue, SQLite has a lock timeout. If it detects that a thread is waiting for a lock for more than default time(5 seconds), it stops the process and we face the SQLite DB is locked error.
To repair this error, you can increase the timeout value from the timeout database option.
If you are finding difficulty in manual methods, then you can use the alternate method of using an SQLite Database Recovery software. It recovers all the SQLite database and fixes the corruptions in the database created by both SQLite2 and SQLite3 easily. Also, it is an efficient tool with an advanced algorithm that can effectively restore the SQLite Database.
In this article, I have discussed the SQLite error Database is locked. In addition to this, the reasons behind its occurrence and the possible manual and automated methods to resolve this particular error are also discussed. Go through these solutions as per your choice. If you have any other query regarding the process, then do let me know, I’ll do my best to help you out. I hope this article is able to resolve your issue.
About The Author:
Pallavi is a content writer in the field of data recovery and email migration. She has a passion for creating engaging and thought-provoking content. With several years of experience in the field, she has developed a deep understanding of various writing styles and formats,
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