I know ldf will increase 'ad infinitum' if i do not take backup log... and the TLS schema will not works if i don't. Refering to indexing... well, Olla's solution is what i've implemented in deed...

As i've wrote, my goal is to give to ldf an ideal size between it gigant current size and that wich contemplating the longest estimated transaction.That is the reason why i want to shrink a little the ldf file, desallocate the innecesary allocated space, not all the allocated space. Resources are limited, the requirement, aren't... So, we need do a balance of it.

Thanks a lot to all for suggestions.