Transaction Log Files

Hi All,

I am trying to understand the difference between the physical, logical and virtual logs. I found some info in BOL, but I am still a little bit confused.
What is the physical file? Is each transaction considered a physical file?
Each physical log file consists of a number of virtual log files.
Then what about the logical log? When does it come into play?

Thanks.

Each db file has logical name and physical name. For instance, logical file name of pubs db's log is pubs_log while physical name is pubs_log.ldf. Sql server uses logical name internally, and you can find both names in sysfiles1 table.

Thank you very much for your respond.