Flash memory based databases

[lferasu]

i'm looking for someone who can help me out
the thing that i didn't understand is .... i was reading about flash memory based databases. and i can't find any conclusive idea on how query costs are measured if the databases are flash memory resident. for example if the database is a hard disk resident the cost of a query algorithm is measured in terms of disk seeks and block transfers.
my question is how do we measure query costs for flash memory based DB....say a nested loop join query algorithm
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thanks in advance

[skhanal]

Optimizer can use number of blocks scanned, CPU cycle required, as metrics for choosing a plan.

[lferasu]

can you explain me more, or give me a link that i could read from
thanx

[skhanal]

http://www.filibeto.org/sun/lib/nons...4261/query.htm

or google

oracle timesten optimizer cost