Error Handling & Logging 
Settings > Options > Error Handling & Logging

Log Database Errors to a File

If you would like to log all database errors to a file, enter the path to the file here. The file will be saved as {filename}.log.
Note:
Please note that the directory in which this file is to be created must be writable by the web server.
Log Failed Admin Control Panel Logins to a File

If you would like to log all failed Admin Control Panel login attempts to a file, enter the path to the file here. The file will be saved as {filename}.log
Note:
Please note that the directory in which this file is to be created must be writable by the web server.
Log PHP Errors to a File

If you would like to log all PHP fatal errors to a file, enter the path to the file here. The file will be saved as {filename}.log.
Note:
Please note that the directory in which this file is to be created must be writable by the web server.
Maximum File Size of Error Logs (default: 1048576)

If you would like your vBulletin error logs to be rotated when they reach a certain size, enter the maximum file size in bytes here.
1048576 bytes = 1 megabyte.

When a log file reaches this size, it will be renamed as {filename}{unix timestamp}.log and a new file will be created.

Set this value to 0 to disable log rotation.

Disable Database Error Email Sending (yes/no)

If you would like to prevent vBulletin from sending email to the $config['Database']['technicalemail'] address you specified in config.php, set this value to 'Yes'.
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