The PL/SQL command (select/update) was hanged for long time

We have a proc program to access a 160 rows table (F_TRDATA), however, it always hanged for a long time, then it was retarted by our defence process.
(1)Table structure:
SQL> desc F_TRDATA;
Name Null? Type
SCP_NBR NUMBER
A_INDEX NUMBER
A_BITMAP LONG
SQL> select index_name, column_name from user_ind_columns where TABLE_NAME='F_TRDATA';
INDEX_NAME
COLUMN_NAME
I_F_TRDATA
SCP_NBR
I_F_TRDATA
A_INDEX
(2)Use DBLINK between two different machines:
LONG rtc;
char f_tabname[100];
EXEC SQL BEGIN DECLARE SECTION;
char srvname[100];
char dblink_name[100];
EXEC SQL END DECLARE SECTION;
sprintf(srvname,"%s",(const char*)STRING(INOBJECT::srvname).ToUpper());
EXEC SQL SELECT DB_LINK INTO :dblink_name FROM ALL_DB_LINKS WHERE OWNER=:srvname;
     db.setLastSqlCode(sqlca.sqlcode);
     if (sqlca.sqlcode!=0)
          TRACE("SELECT DB_LINK error "<<sqlca.sqlerrm.sqlerrmc)
          return VAL_ERROR;
     else
          TRACE("SELECT DB_LINK OK");
sprintf(f_tabname,"F_%s@%s",(const char*)STRING(parent->getClassName()),(const char*)STRING(dblink_name));
TRACE_SHOW(f_tabname);
rtc=get_free_ri(f_tabname);
EXEC SQL COMMIT;
(3)get_free_ri ():
memset(s_ln,0,800);
sprintf(s_ln,"SELECT A_BITMAP FROM %s WHERE A_INDEX=:a AND SCP_NBR=:b \
          FOR UPDATE OF A_BITMAP",tab);
EXEC SQL PREPARE S FROM :s_ln;
if (sqlca.sqlcode)
{TRACE(""<<s_ln);
TRACE(""<<sqlca.sqlerrm.sqlerrmc);
EXEC SQL DECLARE C_FREE_RI CURSOR FOR S;
if (sqlca.sqlcode) {TRACE("DECLARE C_FREE_RI : "<<sqlca.sqlerrm.sqlerrmc)};
memset(s_ln,0,800);
sprintf(s_ln,"UPDATE %s SET A_BITMAP=:a WHERE A_INDEX=:b AND SCP_NBR=:c",
     tab);
EXEC SQL PREPARE S FROM :s_ln;
EXEC SQL EXECUTE S USING :bitmap,:rand_ind,:scp;
switch(sqlca.sqlcode)
{case 0: /* FOUND */
(4)Trace tools:
select SQL_TEXT from v$sql where HASH_VALUE=(select SQL_HASH_VALUE from v$session where process=10775);
select SQL_TEXT from v$sql where HASH_VALUE=(select PREV_HASH_VALUE from v$session where process=10775);
select XIDUSN,object_id,locked_mode from v$locked_object where object_id =
(select l.object_id from v$locked_object l,v$session s where s.sid=l.session_id and s.process=10775);
select s1.SEQ#,s1.P1,s1.P1TEXT,s1.P2,s1.P2TEXT,s1.P3,s1.P3TEXT,s1.EVENT,e.PARAMETER1,e.PARAMETER2,e.PARAMETER3,s1.WAIT_TIME,s1.SECONDS_IN_WAIT,s1.STATE from
v$session_wait s1,v$session s2,v$event_name e where s1.sid=s2.sid and e.name=s1.EVENT and s2.process=10775;
(5)Trace info:
SQL> start P6-3.sql1
SQL_TEXT
SELECT "A1"."A_BITMAP" FROM "F_TRDATA" "A1" WHERE "A1"."A_INDEX"=:A AND "A1"."SCP_NBR"=:B FOR UPDATE
OF A1."A_BITMAP"
SELECT "A1"."A_BITMAP" FROM "F_TRDATA" "A1" WHERE "A1"."A_INDEX"=:A AND "A1"."SCP_NBR"=:B FOR UPDATE
OF A1."A_BITMAP"
SQL_TEXT
SELECT "A1"."A_BITMAP" FROM "F_TRDATA" "A1" WHERE "A1"."A_INDEX"=:A AND "A1"."SCP_NBR"=:B FOR UPDATE
OF A1."A_BITMAP"
SELECT "A1"."A_BITMAP" FROM "F_TRDATA" "A1" WHERE "A1"."A_INDEX"=:A AND "A1"."SCP_NBR"=:B FOR UPDATE
OF A1."A_BITMAP"
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
      1897 1413697536 driver id                                                                 1
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
#bytes                                                                    0
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
SQL*Net message from client
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
driver id
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
#bytes
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
                                                                          0          197725
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
WAITING
      SEQ#         P1 P1TEXT                                                                   P2
P2TEXT                                                                   P3
P3TEXT
EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
SQL> spool off
SQL> start P6-4.sql1
SQL_TEXT
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
SQL_TEXT
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
UPDATE "F_TRDATA" "A1" SET "A_BITMAP" = :A WHERE "A1"."A_INDEX"=:B AND "A1"."SCP_NBR"=:C
      SEQ# EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
       657 SQL*Net message from client
driver id
#bytes
      SEQ# EVENT
PARAMETER1
PARAMETER2
PARAMETER3                                                        WAIT_TIME SECONDS_IN_WAIT
STATE
                                                                          0          311573
WAITING
SQL> spool off
(6)We found no locked sessions, and the proecess was hanged when it executed SELECT and UPDATE command. However, the system CPU traffic and I/O traffic was not high.

up?
up ... in the sky?
up ... my shirt sleeve?
up ... above the streets and houses, rainbow's flying high, everyone can see a rainbow, in the sky.... paint the whole world with a RAINBOW!
up ... yours?

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Attachments:
VI_properties.png ‏15 KB

The PL/SQL command (select/update) was hanged for long time

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