SQL log file behavior

Hi, 

I am planing for SQL disaster recovery. Can anyone help check my understand is correct or not?

- The moment when SQL commit the transaction (insert/update/delete)

1. SQL updates data in memory page

2. SQL append log to log file on disk

3. When page full, move data from memory page to disk (write data file)

Then, my assumption...

1. if we manually unplug SQL server, the latest committed transaction is in log file. The incomplete transaction is not commit

2. SQL needs high speed disk for log file because it has to write log of every single committed transaction.

Thank you in advance.

Chaba

___________________________________________________ Naruphon blog: http://www.vm360degree.com