The "database is locked" error you're encountering with your Prefect server is a common issue when using SQLite, especially under concurrent access conditions. This error typically arises when multiple operations attempt to access the database simultaneously, which SQLite can struggle with due to its locking mechanism.
Here are some steps to address this issue:
1.
Switch to a More Robust Database: If you are running Prefect in a production-like environment, consider switching from SQLite to a more robust database system like PostgreSQL. SQLite is not well-suited for high-concurrency environments.
2.
Review Database Usage: Examine your server's database usage patterns. If possible, reduce the number of concurrent writes to the SQLite database.
3.
Increase Timeout Settings: If you must stick with SQLite, you might try increasing the timeout settings to give transactions more time to complete before a lock error occurs.
4.
Check for Long Transactions: Make sure there are no long-running transactions that could be holding locks for extended periods.
5.
Upgrade Prefect: Ensure you are using the latest version of Prefect, as updates often include performance improvements and bug fixes.
For more detailed discussions on similar issues, you can refer to the following GitHub issues:
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Prefect server deployed with SQLite has log errors
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Long load times with Prefect Server
If you continue to face issues, consider reaching out to the Prefect community or support for more tailored assistance.