Making sql faster not in pl.sql but in sql

Question

this sql takes a long time running from Application to oracle database
11.2.0.3.0 on win 2008 r2
in Toad it runs much faster
any suggestions to make it faster in SQL, this is dynamic code where 1500000 is bind variable passed from application side. this can be 10million 20million ...etc
there are enough indexes, constraints on the related tables below. thought of using /*+APPEND*/
cant use BULK COLLECT as its part of PL/SQL
any suggestions
INSERT INTO pds.dlg_participant
(dp_id, dp_dg_id, dp_dlg_id, dp_customer_id, dp_context, dp_inserted_timestamp, dp_moved_timestamp, dp_active, dp_internal_id)
(SELECT
pds.DLG_PARTICIPANT_SEQ.NEXTVAL,
1224,
1074,
mh_customer_id,
mh_context,
SYSDATE,
SYSDATE,
0,
7820
FROM
SELECT
Relations.MARE_ID as mh_customer_id,
'0' as mh_context,
null as mh_participant_id
FROM
(select *
from Testuser.RelationsEnriched_10M
) Relations
WHERE
((1500000 >= Relations.MARE_ID)))
AND
NOT EXISTS (SELECT
dp_id
FROM
pds.dlg_participant,
pds.dlg_group
WHERE
(dp_dg_id = dg_id) AND
(dg_dlg_id = 1074) AND
(dp_active = 0) AND
(dp_customer_id = Relations.MARE_ID)) ) mh_container
)

Answer 1

912919 wrote:
this sql takes a long time running from Application to oracle database
11.2.0.3.0 on win 2008 r2
in Toad it runs much fasterYou did not post timings of the execution. So, how can we see or you prove that it actually runs faster in Toad than on SQL Prompt.
I will suggest you to do the following and post the details here:
@SQL Prompt
ALTER session SET TIMED_STATISTICS = TRUE;
Execute your Insert Statement;
@Toad
ALTER session SET TIMED_STATISTICS = TRUE;
Execute your Insert Statement;Post the timing details here. Also it will be highly appreciable if you can post the Explain plan or the TKPROF output.
Just in case you are not aware of getting TKPROF, read here.
any suggestions to make it faster in SQL, this is dynamic code where 1500000 is bind variable passed from application side. this can be 10million 20million ...etc
there are enough indexes, constraints on the related tables below. thought of using /*+APPEND*/
cant use BULK COLLECT as its part of PL/SQL
any suggestionsIn order to speed us the Insert Select Operations, the key for improvement in performance lies, mostly, in the Select statement. So, if you can optimize the select statment you would have achieved most of the job.
If this is a One time or A Data Load performed during an Outage or Low activity period, you can alter the table to NOLOGGING and perform INSERT APPEND and then alter table back to LOGGING.