How to solve the 5120 error in SQL

Solution: 1. Check whether the logged-in user has sufficient permissions to access or operate the database, and ensure that the user has the correct permissions; 2. Check whether the account of the SQL Server service has access to the specified file or folder permissions to ensure that the account has sufficient permissions to read and write the file or folder; 3. Check whether the specified database file has been opened or locked by other processes, try to close or release the file, and rerun the query; 4. Try running Management Studio as an administrator, etc.

SQL Server error 5120 is caused by insufficient permissions to access or operate the specified database or file. Here are a few ways to resolve this issue:

1. Check whether the logged in user has sufficient permissions to access or operate the database. Make sure the user has the correct permissions, such as sysadmin, db_owner, or db_datareader.

2. Check whether the account of the SQL Server service has permission to access the specified file or folder. Make sure that the account has sufficient permissions to read and write to the file or folder.

3. Check whether the specified database file has been opened or locked by other processes. Try closing or freeing the file and rerunning the query.

4. If you are using SQL Server Management Studio to run the query, try running Management Studio as an administrator. Right-click the Management Studio shortcut and select "Run as administrator."

5. If you are using SQL Server Express edition, please make sure that your database files are not placed in a protected folder, such as the “Program Files” folder. You can move the database files to another location, such as the user folder or the root of drive D, and reconnect to the database.

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