question about updates internal work in case of cache

[DE VITO Dominique]

Hi,

Let's suppose a column (name+value) is cached in memory, with timestamp T.

1) An update, for this column, arrives with exactly the *same* timestamp, and 
the *same* value.
Is the commitlog updated ?

2) An update, for this column, arrives with a timestamp < T.
Is the commitlog updated ?

Thanks for your help.

Regards,
Dominique