Deleting 1 row from a table takes too long...why?

We are running the following query...
delete gemdev.lu_messagecode where mess_code ='SSY'
and it takes way too long as there is only 1 record in this table with SSY as the mess_code.
SQL> set timing on;
SQL> delete gemdev.lu_messagecode where mess_code ='SSY';
1 row deleted
Executed in 293.469 seconds
The table structure is very simple as you can see below.
CREATE TABLE GEMDEV.LU_MESSAGECODE
MESS_CODE VARCHAR2(3) NOT NULL,
ROUTE_CODE VARCHAR2(4) NULL,
REPORT_CES_MNEMONIC VARCHAR2(3) NULL,
CONSTRAINT SYS_IOT_TOP_52662
PRIMARY KEY (MESS_CODE)
VALIDATE
ORGANIZATION INDEX
NOCOMPRESS
TABLESPACE IWORKS_IOT
LOGGING
PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE(BUFFER_POOL DEFAULT)
PCTTHRESHOLD 50
NOPARALLEL
ALTER TABLE GEMDEV.LU_MESSAGECODE
ADD CONSTRAINT LU_ROUTECODE_FK3
FOREIGN KEY (ROUTE_CODE)
REFERENCES GEMDEV.LU_ROUTECODE (ROUTE_CODE)
ENABLE
ALTER TABLE GEMDEV.LU_MESSAGECODE
ADD CONSTRAINT MSGCODE_FK_CESMNEMONIC
FOREIGN KEY (REPORT_CES_MNEMONIC)
REFERENCES GEMDEV.SYS_CESMNEMONIC (CES_MNEMONIC)
ENABLE
My explain reads as follows.
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | DELETE STATEMENT | | | | 1 (100)| |
| 1 | DELETE | LU_MESSAGECODE | | | | |
| 2 | INDEX UNIQUE SCAN| SYS_IOT_TOP_52662 | 1 | 133 | 1 (0)| 00:00:01 |
Also in my AWR Sql Report I see this as well
Plan Statistics DB/Inst: IWORKSDB/iworksdb Snaps: 778-780
-> % Total DB Time is the Elapsed Time of the SQL statement divided
into the Total Database Time multiplied by 100
Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 521,102 N/A 12.0
CPU Time (ms) 73,922 N/A 5.1
Executions 0 N/A N/A
Buffer Gets 2,892,144 N/A 3.4
Disk Reads 2,847,609 N/A 8.6
Parse Calls 1 N/A 0.0
Rows 0 N/A N/A
User I/O Wait Time (ms) 475,882 N/A N/A
Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 2 N/A N/A
Invalidations 1 N/A N/A
Version Count 1 N/A N/A
Sharable Mem(KB) 45 N/A N/A
Now, since the table only has 150 rows, and I am only try to delete 1 row, why is there so much disk read and why does it take 5 minutes to delete? This just weird. Does this have something to do with the Child tables?

Any triggers on the table?
If you trace the session, what statement(s) seem to
be taking all that time?
JustinWell I traced my session and I noticed that my query does take a while, but I also noticed several other queries that I was not running. Not too sure where it came from. Have a look below. It is a sample from my TKPROF utility report.
delete gemdev.lu_messagecode
where
mess_code ='SSY'
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.01 0.04 0 2 23 1
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.01 0.04 0 2 23 1
Misses in library cache during parse: 1
Optimizer mode: FIRST_ROWS
Parsing user id: 57
Rows Row Source Operation
1 DELETE LU_MESSAGECODE (cr=3446672 pr=3442028 pw=0 time=309363335 us)
1 INDEX UNIQUE SCAN SYS_IOT_TOP_52662 (cr=2 pr=0 pw=0 time=35 us)(object id 52663)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
SQL*Net message to client 1 0.00 0.00
SQL*Net message from client 1 35.87 35.87
select /*+ all_rows */ count(1)
from
"GEMDEV"."TBLCLAIMCHARGE" where "CONTRACT_FEE_MESS_CODE" = :1
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 1 10.53 44.95 381779 382893 0 1
total 3 10.53 44.95 381779 382893 0 1
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: SYS (recursive depth: 1)
Rows Row Source Operation
1 SORT AGGREGATE (cr=382893 pr=381779 pw=0 time=44953436 us)
0 TABLE ACCESS FULL TBLCLAIMCHARGE (cr=382893 pr=381779 pw=0 time=44953403 us)
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
---------------------------------------- Waited ---------- ------------
db file scattered read 47795 0.03 37.87
db file sequential read 101 0.00 0.02
select /*+ all_rows */ count(1)
from
"GEMDEV"."TBLCLAIMCHARGE" where "FEE_INEL_MESS_CODE" = :1

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