What should be take action against following sql tuning report.

Hi
what should be take action against following sql tuning report.
SQL ID : fn3mt5dvm7fba
SQL Text : SELECT * FROM (select
 to_number(ow.waybl_no) waybl_no,ow.id wb_id,
 To_Number(ogp.gp_no) gp_no,
 To_Number(ots.trip_sht_no) trip_sht_no,
 otr.nm,
 ots.gty_br_mast_id,
 DECODE(otr.sign_recd,'1','YES','NO') Sign_Recd,
 DECODE(otr.stamped,'1','YES','NO') Stamped,
 otr.dlvry_dt dlvry_dt,
 otr.tel_no,
 --otr.remarks,
 Decode(otr.comments, NULL,'','Yes') remarks,
 otr.id ID,ops_safex_utl.get_br_nm(to_number(ow.bkg_br_mast_id))
book_br,
 ow.pick_dt book_date
from
 ops_ts_reconsile otr,
 ops_pultd_wb_dtls opuwd,
 ops_trip_sht ots,
 ops_waybl ow,
 ops_ultd_wb_dtls ouwd,
 ops_gate_pass ogp
where
 otr.trip_sht_id=ots.id and
 otr.pultd_wb_dtls_id=opuwd.id and
 opuwd.ultd_wb_dtls_id=ouwd.id and
 ouwd.gate_pass_id=ogp.id and
 opuwd.waybl_id=ow.id and
 otr.status_lid=157 and
 ots.gty_br_mast_id = (:br_Id) and
 (otr.dlvry_dt = :searchDate OR :searchDate IS NULL) and
 otr.note_prpd = 'N' and otr.pod_recd = '1' and
 not exists (select TS_RECONSILE_ID from OPS_POD_FRWD_NOTE_DTLS
where TS_RECONSILE_ID = otr.id)
union
select
 to_number(ow.waybl_no) waybl_no, ow.id wb_id,
 To_Number(ogp.gp_no) gp_no,
 null trip_sht_no,
 ogr.nm,
 ogp.dlvry_br_mast_id,
 DECODE(ogr.sign_recd,'Y','YES','NO') Sign_Recd,
 DECODE(ogr.stamped,'Y','YES','NO') Stamped,
 ogr.dlvry_dt dlvry_dt,
 ogr.tel_no,
 --ogr.remarks,
 Decode(ogr.comments, NULL,'', 'Yes') remarks,
 ogr.id ID,ops_safex_utl.get_br_nm(to_number(ow.bkg_br_mast_id))
book_br,
 ow.pick_dt book_date
from
 ops_gp_reconcile ogr,
 ops_gate_pass ogp,
 ops_waybl ow
where
 ogr.gp_id=ogp.id and
 ogp.waybl_id=ow.id and
 ogp.dlvry_br_mast_id = (:br_Id) and
 (ogr.dlvry_dt = :searchDate) and
 ogr.note_prpd = 'N' and ogr.pod_recd = 'Y' and
 not exists (select GP_RECONSILE_ID from OPS_POD_FRWD_NOTE_DTLS
where GP_RECONSILE_ID = ogr.id)) QRSLT ORDER BY trip_sht_no desc
Bind Variables :
1 - (VARCHAR2(32)):37069
2 - (DATE):07/11/2011 00:00:00
3 - (DATE):07/11/2011 00:00:00
4 - (VARCHAR2(32)):37069
5 - (DATE):07/11/2011 00:00:00
FINDINGS SECTION (3 findings)
1- SQL Profile Finding (see explain plans section below)
2 potentially better execution plans were found for this statement. Choose
one of the following SQL profiles to implement.
Recommendation (estimated benefit<=10%)
- Consider accepting the recommended SQL profile.
execute dbms_sqltune.accept_sql_profile(task_name => 'TASK_58643',
task_owner => 'SYS', replace => TRUE);
Recommendation (estimated benefit: 99.15%)
- Consider accepting the recommended SQL profile to use parallel execution
for this statement.
execute dbms_sqltune.accept_sql_profile(task_name => 'TASK_58643',
task_owner => 'SYS', replace => TRUE, profile_type =>DBMS_SQLTUNE.PX_PROFILE);
Executing this query parallel with DOP 128 will improve its response time
99.11% over the SQL profile plan. However, there is some cost in enabling
parallel execution. It will increase the statement's resource consumption by
an estimated 14.56% which may result in a reduction of system throughput.
Also, because these resources are consumed over a much smaller duration, the
response time of concurrent statements might be negatively impacted if
sufficient hardware capacity is not available.
The following data shows some sampled statistics for this SQL from the past
week and projected weekly values when parallel execution is enabled.
Past week sampled statistics for this SQL
Number of executions 17494
Percent of total activity 7.2
Percent of samples with #Active Sessions > 2*CPU .63
Weekly DB time (in sec) 614696.04
Projected statistics with Parallel Execution
Weekly DB time (in sec) 704166.9
2- Restructure SQL finding (see plan 1 in explain plans section)
An expensive "UNION" operation was found at line ID 4 of the execution plan.
Recommendation
- Consider using "UNION ALL" instead of "UNION", if duplicates are allowed
or uniqueness is guaranteed.
3- Alternative Plan Finding
Some alternative execution plans for this statement were found by searching
the system's real-time and historical performance data.
The following table lists these plans ranked by their average elapsed time.
See section "ALTERNATIVE PLANS SECTION" for detailed information on each
plan.
id plan hash last seen elapsed (s) origin note
1 209247904 2011-07-12/10:09:08 7.564 Cursor Cache
2 4029269565 2011-07-12/10:20:21 15.374 Cursor Cache original plan
3 4128886984 2011-07-08/11:30:25 42.426 AWR
4 3695555639 2011-07-12/08:30:30 101.459 AWR
Recommendation
- Consider creating a SQL plan baseline for the plan with the best average
elapsed time.
execute dbms_sqltune.create_sql_plan_baseline(task_name => 'TASK_58643',
owner_name => 'SYS', plan_hash_value => 209247904);
ADDITIONAL INFORMATION SECTION
- The optimizer could not merge the view at line ID 3 of the execution plan.
The optimizer cannot merge a view that contains a set operator.
- SQL Profile "SYS_SQLPROF_01306b26f6aa0000" exists for this statement and
was ignored during the tuning process.

afzal wrote:
Hi
what should be take action against following sql tuning report.
<snip>Perhaps no action at all.
You can ALWAYS produce a report that will show "top 5" issues. The question is NOT "do I have an issue reported by a tuning report". Yes you do. Everyone does. Always. Even if you slowest batch job runs in 1.3 seconds and your slowest OLTP transaction completes in 0.0001 second.
The question is "do I have a problem that is serious enough to spend time solving?"
If your average OLTP transaction completes in 3 seconds, how much effort is justified to get a 50% improvement?
How much effort is justified to get that same 50% improvement on transactions that complete in 1.5 seconds? 0.2 seconds?
Beware of Compulsive Tuning Disorder.

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