Improve performance query!

Question

First, I don't have explain plan for below query. Since it's just a straight forward insert statement, maybe somebody can just recommend a different approach.I'm thinking of using a BULK COLLECT/FORALL statement coz the SQL is being run inside the PL/SQL. Thank you in advance for the help.
insert into etl_adwh.tmp_pc
(client_id)
select client_id
from prc_bond_acrl_chg_v
union all
select client_id
from prc_bond_factor_chg_v
union all
select client_id
from prc_currencies_chg_v
union all
select client_id
from prc_contracts_chg_v
union all
select client_id
from prc_debts_chg_v
union all
select client_id
from prc_stocks_chg_v
union all
select client_id
from prc_options_chg_v;

Answer 1

No need to overload us with details! A simple summary will suffice. (Translation- you aren't giving anyone a whole lot to work with).
You say you want help with the "query" but it's an insert you are doing. How many rows? How long is it taking? You're unioning multiple views (I'm guessing from the "_v" name) together. How efficient are they at getting their data? Maybe you are getting a simple client_id from a really horrific view that does all sorts of complex things or sorts which you have no control over? Is this a one time load or a thing you will be doing on a regular basis? Do you have any triggers on the destination table?
Perhaps you can enable parallel operations on the table you are inserting into. You could try bulk collect. You could insert nologging. Insert /*+ append */. Not enough info really.