identifie blocking process

hi Guys

imagine i set a begin transaction on table a and updating a row and not committed and not roll backed--first connection

from second connection i am selecting same table(obviously it wait until first connection commits/rollback based on my transaction level:my isolation level is read commited)

1.how do i know second connection is to waiting to first connection to complete

2.if i want to select rows that are not locked by update process how do i need to do(ex:row 1,2,3,4 and 1 is locked by update process(exclusive lock) and i want to leave that and i need to select 2,3,4 records)

Very much thanks in advance

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ADKR