SQL & PL/SQL

Hi,
I am writing the following function which is causing high response time. Can you please help? Please SBMS_SQLTUNE advise.

GENERAL INFORMATION SECTION
-------------------------------------------------------------------------------
Tuning Task Name : BFG_TUNING1
Tuning Task Owner : ARADMIN
Scope : COMPREHENSIVE
Time Limit(seconds) : 60
Completion Status : COMPLETED
Started at : 01/28/2013 15:48:39
Completed at : 01/28/2013 15:49:43
Number of SQL Restructure Findings: 7
Number of Errors : 1

-------------------------------------------------------------------------------
Schema Name: ARADMIN
SQL ID : 2d61kbs9vpvp6
SQL Text : SELECT /*+no_merge(chg)*/ chg.CHANGE_REFERENCE,
chg.Customer_Name, chg.Customer_ID, chg.Contract_ID,
chg.Change_Title, chg.Change_Type, chg.Change_Description,
chg.Risk, chg.Impact, chg.Urgency, chg.Scheduled_Start_Date,
chg.Scheduled_End_Date, chg.Scheduled_Start_Date_Int,
chg.Scheduled_End_Date_Int, chg.Outage_Required,
chg.Change_Status, chg.Change_Status_IM, chg.Reason_for_change,
chg.Customer_Visible, chg.Change_Source,
chg.Related_Ticket_Type, chg.Related_Ticket_ID,
chg.Requested_By, chg.Requested_For, chg.Site_ID, chg.Site_Name,
chg.Element_id, chg.Element_Type, chg.Element_Name,
chg.Search_flag, chg.remedy_id, chg.Change_Manager,
chg.Email_Manager, chg.Queue, a.customer as CUSTOMER_IM,
a.contract as CONTRACT_IM, a.cid FROM exp_cm_cusid1 a, (sELECT *
FROM EXP_BFG_CM_JOIN_V WHERE CUSTOMER_ID = 14187) chg WHERE
a.bfg_con_id IS NULL AND a.bfg_cus_id = chg.customer_id AND
NOT EXISTS (SELECT a.bfg_con_id FROM exp_cm_cusid1 a WHERE
a.bfg_con_id IS NOT NULL AND a.bfg_cus_id = chg.customer_id
AND a.bfg_con_id = chg.contract_id ) UNION SELECT
/*+no_marge(chg)*/ chg.CHANGE_REFERENCE, chg.Customer_Name,
chg.Customer_ID, chg.Contract_ID, chg.Change_Title,
chg.Change_Type, chg.Change_Description, chg.Risk, chg.Impact,
chg.Urgency, chg.Scheduled_Start_Date, chg.Scheduled_End_Date,
chg.Scheduled_Start_Date_Int, chg.Scheduled_End_Date_Int,
chg.Outage_Required, chg.Change_Status, chg.Change_Status_IM,
chg.Reason_for_change, chg.Customer_Visible, chg.Change_Source,
chg.Related_Ticket_Type, chg.Related_Ticket_ID,
chg.Requested_By, chg.Requested_For, chg.Site_ID, chg.Site_Name,
chg.Element_id, chg.Element_Type, chg.Element_Name,
chg.Search_flag, chg.remedy_id, chg.Change_Manager,
chg.Email_Manager, chg.Queue, a.customer as CUSTOMER_IM,
a.contract as CONTRACT_IM, a.cid FROM exp_cm_cusid1 a, (sELECT *
FROM EXP_BFG_CM_JOIN_V WHERE CUSTOMER_ID = 14187) chg WHERE
a.bfg_cus_id = chg.customer_id AND a.bfg_con_id =
chg.contract_id AND a.bfg_con_id IS NOT NULL

-------------------------------------------------------------------------------
FINDINGS SECTION (7 findings)
-------------------------------------------------------------------------------

1- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate REGEXP_LIKE ("T100"."C536871160",'^[[:digit:]]+$') used at
line ID 26 of the execution plan contains an expression on indexed column
"C536871160". This expression prevents the optimizer from selecting indices
on table "ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

2- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate TO_NUMBER(TRIM("T100"."C536871160"))=:B1 used at line ID 26 of
the execution plan contains an expression on indexed column "C536871160".
This expression prevents the optimizer from selecting indices on table
"ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

3- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate REGEXP_LIKE ("T100"."C536871160",'^[[:digit:]]+$') used at
line ID 10 of the execution plan contains an expression on indexed column
"C536871160". This expression prevents the optimizer from selecting indices
on table "ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

4- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate TO_NUMBER(TRIM("T100"."C536871160"))=:B1 used at line ID 10 of
the execution plan contains an expression on indexed column "C536871160".
This expression prevents the optimizer from selecting indices on table
"ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

5- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate REGEXP_LIKE ("T100"."C536871160",'^[[:digit:]]+$') used at
line ID 6 of the execution plan contains an expression on indexed column
"C536871160". This expression prevents the optimizer from selecting indices
on table "ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

6- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
The predicate TO_NUMBER(TRIM("T100"."C536871160"))=:B1 used at line ID 6 of
the execution plan contains an expression on indexed column "C536871160".
This expression prevents the optimizer from selecting indices on table
"ARADMIN"."T100".

Recommendation
--------------
- Rewrite the predicate into an equivalent form to take advantage of
indices. Alternatively, create a function-based index on the expression.

Rationale
---------
The optimizer is unable to use an index if the predicate is an inequality
condition or if there is an expression or an implicit data type conversion
on the indexed column.

7- Restructure SQL finding (see plan 1 in explain plans section)
----------------------------------------------------------------
An expensive "UNION" operation was found at line ID 1 of the execution plan.

Recommendation
--------------
- Consider using "UNION ALL" instead of "UNION", if duplicates are allowed
or uniqueness is guaranteed.

Rationale
---------
"UNION" is an expensive and blocking operation because it requires
elimination of duplicate rows. "UNION ALL" is a cheaper alternative,
assuming that duplicates are allowed or uniqueness is guaranteed.

-------------------------------------------------------------------------------
ERRORS SECTION
-------------------------------------------------------------------------------
- The current operation was interrupted because it timed out.

-------------------------------------------------------------------------------
EXPLAIN PLANS SECTION
-------------------------------------------------------------------------------

1- Original
-----------
Plan hash value: 1047651452

---------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Inst |IN-OUT|
---------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 2 | 28290 | 567 (37)| 00:00:07 | | |
| 1 | SORT UNIQUE | | 2 | 28290 | 567 (37)| 00:00:07 | | |
| 2 | UNION-ALL | | | | | | | |
|* 3 | HASH JOIN RIGHT ANTI | | 1 | 14158 | 373 (5)| 00:00:05 | | |
| 4 | VIEW | VW_SQ_1 | 1 | 26 | 179 (3)| 00:00:03 | | |
| 5 | NESTED LOOPS | | 1 | 37 | 179 (3)| 00:00:03 | | |
|* 6 | TABLE ACCESS FULL | T100 | 1 | 28 | 178 (3)| 00:00:03 | | |
|* 7 | INDEX RANGE SCAN | I1451_536870913_1 | 1 | 9 | 1 (0)| 00:00:01 | | |
| 8 | NESTED LOOPS | | 1 | 14132 | 193 (5)| 00:00:03 | | |
|* 9 | HASH JOIN | | 1 | 14085 | 192 (5)| 00:00:03 | | |
|* 10 | TABLE ACCESS FULL | T100 | 1 | 28 | 178 (3)| 00:00:03 | | |
| 11 | VIEW | EXP_BFG_CM_JOIN_V | 3 | 42171 | 13 (24)| 00:00:01 | | |
| 12 | UNION-ALL | | | | | | | |
|* 13 | HASH JOIN | | 1 | 6389 | 5 (20)| 00:00:01 | | |
| 14 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 15 | REMOTE | PROP_CHANGE_INVENTORY_V | 1 | 410 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 16 | HASH UNIQUE | | 1 | 6052 | 6 (34)| 00:00:01 | | |
|* 17 | HASH JOIN | | 1 | 6052 | 5 (20)| 00:00:01 | | |
| 18 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 19 | REMOTE | PROP_CHANGE_INVENTORY_V | 1 | 73 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 20 | HASH UNIQUE | | 1 | 5979 | 3 (34)| 00:00:01 | | |
| 21 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 22 | TABLE ACCESS BY INDEX ROWID| T1451 | 1 | 47 | 1 (0)| 00:00:01 | | |
|* 23 | INDEX RANGE SCAN | I1451_536870913_1 | 1 | | 1 (0)| 00:00:01 | | |
| 24 | NESTED LOOPS | | 1 | 14132 | 193 (5)| 00:00:03 | | |
|* 25 | HASH JOIN | | 1 | 14085 | 192 (5)| 00:00:03 | | |
|* 26 | TABLE ACCESS FULL | T100 | 1 | 28 | 178 (3)| 00:00:03 | | |
| 27 | VIEW | EXP_BFG_CM_JOIN_V | 3 | 42171 | 13 (24)| 00:00:01 | | |
| 28 | UNION-ALL | | | | | | | |
|* 29 | HASH JOIN | | 1 | 6389 | 5 (20)| 00:00:01 | | |
| 30 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 31 | REMOTE | PROP_CHANGE_INVENTORY_V | 1 | 410 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 32 | HASH UNIQUE | | 1 | 6052 | 6 (34)| 00:00:01 | | |
|* 33 | HASH JOIN | | 1 | 6052 | 5 (20)| 00:00:01 | | |
| 34 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 35 | REMOTE | PROP_CHANGE_INVENTORY_V | 1 | 73 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 36 | HASH UNIQUE | | 1 | 5979 | 3 (34)| 00:00:01 | | |
| 37 | REMOTE | PROP_CHANGE_REQUEST_V | 1 | 5979 | 2 (0)| 00:00:01 | ARS_B~ | R->S |
| 38 | TABLE ACCESS BY INDEX ROWID | T1451 | 1 | 47 | 1 (0)| 00:00:01 | | |
|* 39 | INDEX RANGE SCAN | I1451_536870913_1 | 1 | | 1 (0)| 00:00:01 | | |
---------------------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

3 - access("ITEM_0"="EXP_BFG_CM_JOIN_V"."CUSTOMER_ID" AND "ITEM_1"="EXP_BFG_CM_JOIN_V"."CONTRACT_ID")
6 - filter("C536871050" LIKE '%FMS%' AND REGEXP_LIKE ("C536871160",'^[[:digit:]]+$') AND ("C536871088" IS NULL
OR REGEXP_LIKE ("C536871088",'^[[:digit:]]+$')) AND TO_NUMBER(TRIM("C536871088")) IS NOT NULL AND
TO_NUMBER(TRIM("C536871160"))=:SYS_B_0 AND "C536871160" IS NOT NULL AND "C536871050" IS NOT NULL AND "C7"=0)
7 - access("C536870913"="C536870914")
9 - access("EXP_BFG_CM_JOIN_V"."CUSTOMER_ID"=TO_NUMBER(TRIM("C536871160")))
10 - filter("C536871050" LIKE '%FMS%' AND REGEXP_LIKE ("C536871160",'^[[:digit:]]+$') AND ("C536871088" IS NULL
OR REGEXP_LIKE ("C536871088",'^[[:digit:]]+$')) AND TO_NUMBER(TRIM("C536871088")) IS NULL AND
TO_NUMBER(TRIM("C536871160"))=:SYS_B_0 AND "C536871160" IS NOT NULL AND "C536871050" IS NOT NULL AND "C7"=0)
13 - access("CHG"."PRP_CHG_REFERENCE"="INV"."PRP_CHG_REFERENCE")
17 - access("CHG"."PRP_CHG_REFERENCE"="INV"."PRP_CHG_REFERENCE")
23 - access("C536870913"="C536870914")
25 - access("EXP_BFG_CM_JOIN_V"."CUSTOMER_ID"=TO_NUMBER(TRIM("C536871160")) AND
"EXP_BFG_CM_JOIN_V"."CONTRACT_ID"=TO_NUMBER(TRIM("C536871088")))
26 - filter("C536871050" LIKE '%FMS%' AND REGEXP_LIKE ("C536871160",'^[[:digit:]]+$') AND ("C536871088" IS NULL
OR REGEXP_LIKE ("C536871088",'^[[:digit:]]+$')) AND TO_NUMBER(TRIM("C536871088")) IS NOT NULL AND
TO_NUMBER(TRIM("C536871160"))=:SYS_B_1 AND "C536871160" IS NOT NULL AND "C536871050" IS NOT NULL AND "C7"=0)
29 - access("CHG"."PRP_CHG_REFERENCE"="INV"."PRP_CHG_REFERENCE")
33 - access("CHG"."PRP_CHG_REFERENCE"="INV"."PRP_CHG_REFERENCE")
39 - access("C536870913"="C536870914")

Remote SQL Information (identified by operation id):
----------------------------------------------------

14 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )

15 - SELECT "PRP_CHG_REFERENCE","SIT_ID","SIT_NAME","ELEMENT_SUMMARY","PRODUCT_NAME" FROM
"PROP_OWNER2"."PROP_CHANGE_INVENTORY_V" "INV" (accessing 'ARS_BFG_DBLINK.WORLD' )

18 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )

19 - SELECT "PRP_CHG_REFERENCE","SIT_ID","SIT_NAME" FROM "PROP_OWNER2"."PROP_CHANGE_INVENTORY_V" "INV"
(accessing 'ARS_BFG_DBLINK.WORLD' )

21 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )

30 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )

31 - SELECT "PRP_CHG_REFERENCE","SIT_ID","SIT_NAME","ELEMENT_SUMMARY","PRODUCT_NAME" FROM
"PROP_OWNER2"."PROP_CHANGE_INVENTORY_V" "INV" (accessing 'ARS_BFG_DBLINK.WORLD' )

34 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )

35 - SELECT "PRP_CHG_REFERENCE","SIT_ID","SIT_NAME" FROM "PROP_OWNER2"."PROP_CHANGE_INVENTORY_V" "INV"
(accessing 'ARS_BFG_DBLINK.WORLD' )

37 - SELECT "PRP_CHG_REFERENCE","CUS_ID","CUS_NAME","CNT_BFG_ID","PRP_TITLE","PRP_CHG_TYPE","PRP_DESCRIPTION","PR
P_BTIGNITE_PRIORITY","PRP_CUSTOMER_PRIORITY","PRP_CHG_URGENCY","PRP_RESPONSE_REQUIRED_BY","PRP_REQUIRED_BY_DATE","P
RP_CHG_OUTAGE_FLAG","PRP_CHG_STATUS","PRP_CHG_FOR_REASON","PRP_CHG_CUSTOMER_VISIBILITY","PRP_CHG_SOURCE_SYSTEM","PR
P_RELATED_TICKET_TYPE","PRP_RELATED_TICKET_ID","CHANGE_INITIATOR","CHANGE_ORIGINATOR","CHANGE_MANAGER","QUEUE"
FROM "PROP_OWNER2"."PROP_CHANGE_REQUEST_V" "CHG" WHERE "CUS_ID"=:1 (accessing 'ARS_BFG_DBLINK.WORLD' )


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