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We've had issues in the past where a rogue process was keeping a sqlite db locked. I've written some code to notify us if this is happening, but need to test it.
How can I deliberately lock up a sqlite database, so that I can check if it's locked?
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The base SQLite engine doesn't have any password/encryption options. You have to either use the paid SEE option for encryption, or some third party solution.
Locking protocols are used in database management systems as a means of concurrency control. Multiple transactions may request a lock on a data item simultaneously. Hence, we require a mechanism to manage the locking requests made by transactions. Such a mechanism is called as Lock Manager.
You can password protect a SQLite3 DB. Before doing any operations, set the password as follows. conn = new SQLiteConnection("Data Source=MyDatabase. sqlite;Version=3;Password=password;"); conn.
SQLite version 3 seeks to avoid writer starvation through the use of the PENDING lock. The PENDING lock allows existing readers to continue but prevents new readers from connecting to the database. So when a process wants to write a busy database, it can set a PENDING lock which will prevent new readers from coming in.
Execute these statements:
PRAGMA locking_mode = EXCLUSIVE;
BEGIN EXCLUSIVE;
This will lock whole database until you execute:
COMMIT;
For simplicity, you can do this using sqlite3 command line utility.
For more info, see documentation.
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