After the parallel execution, this is the best chance to query the execution information. For Example, to analyze the execution of following parallel SQL statement.
select /*+ ordered use_hash(p c) parallel(p 4) parallel(c 4) pq_distribute(c hash, hash)*/
c.unit_price
from products p, costs c
where c.prod_id = p.prod_id;
After execution,
hlr@ORCL> select * from v$pq_sesstat;
STATISTIC [...]