t-sql to modify transaction log size to be 25% of database

Hi,

You may need to do this up to twice prior to attempting to shrink the log file. Note that you will need to take a full backup reasonably soon after doing this to a production database!!!

(from http://technet.microsoft.com/en-us/library/ms186865(SQL.90).aspx)
Truncating the Transaction Log (breaks the log chain)
BACKUP LOG { database_name | @database_name_var }
  WITH { NO_LOG | TRUNCATE_ONLY }
[;]

HTH
  David

do what twice?

Here is an example of what I usually do which will clarify the comment above from dtodd:
http:Q_23646730.html

thanks.