[erlang-questions] some questions about cocurrent accessing of mnesia while doing table fragment

[devdoer bird]

Hi:
I have  some questions about mnesia table fragment.

While adding a table fragment for the table (say user table for
example),what will happen if  reading or writing operation  the same table
is being performed?Will it cause the table in in-consistent status?

Another question,while performing table fragment operation,the operation :
"
Info=fun(Item)->mnesia:table_info(user,Item) end.
mnesia:activity(sync_dirty,Info,[frag_size],mnesia_frag)
"
 becomes very slow,but the dirty_read operation is quite quick.
Could you someone explain it to me?
Thanks.
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