I am not too sure what you mean by "the database bigger" but to change the upload_max_filesize do this: (works on apache servers only and your host allows you to override those values)
1) create a file called ".htaccess" if you are using windows you may not beable to easily do this instead make a file called "1.htaccess" and when its uploaded rename the file to ".htaccess".
2) in the .htaccess file put the following line:
Code:
php_value upload_max_filesize 8M
3) Upload the file into the directory your upload script is in.