Resource leak problem

Question

Hi
Oracle Database 12.1.0.1.0 "standart edition one" installed on windows 2008 Server R2 SP1 (64 bit).
I configure access to remote Databases MS SQL Server 2008. The access configured via "heterogeneous services".:
1) Created ODBC source 1 : type "ODBC SQL Server 6.01.7601.17514 Microsoft Corparation", name "AOF_Statistic_140"
2) Created ODBC source 2 : type "ODBC SQL Server 6.01.7601.17514 Microsoft Corparation", name "AOF_Statistic"
3)created file "initAOF_Raport.ora" in "с:\app\oracle_db\product\12.1.0\dbhome_1\hs\admin"
Сontent of the file "initAOF_Raport.ora" :
HS_FDS_CONNECT_INFO = AOF_Raport_140
HS_FDS_TRACE_LEVEL=0
HS_LANGUAGE=RUSSIAN_RUSSIA.CL8MSWIN1251
HS_IDLE_TIMEOUT=5
HS_TRANSACTION_MODEL=READ_ONLY
4)created file "initAOF_Statistic.ora" in "с:\app\oracle_db\product\12.1.0\dbhome_1\hs\admin"
Сontent of the file "initAOF_Statistic.ora" :
HS_FDS_CONNECT_INFO = AOF_Statistic_140
HS_FDS_TRACE_LEVEL=0
HS_LANGUAGE=RUSSIAN_RUSSIA.CL8MSWIN1251
HS_IDLE_TIMEOUT=5
HS_TRANSACTION_MODEL=READ_ONLY
5) Сontent of the file "с:\app\oracle_db\product\12.1.0\dbhome_1\network\admin\listener.ora"
SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
  (SID_NAME = CLRExtProc)
  (ORACLE_HOME = с:\app\oracle_db\product\12.1.0\dbhome_1)
  (PROGRAM = extproc)
  (ENVS = "EXTPROC_DLLS=ONLY:с:\app\oracle_db\product\12.1.0\dbhome_1\bin\oraclr12.dll")
  (SID_DESC=
  (SID_NAME= AOF_Statistic)
  (ORACLE_HOME=с:\app\oracle_db\product\12.1.0\dbhome_1)
  (PROGRAM=dg4odbc)
  (SID_DESC=
  (SID_NAME= AOF_Raport)
  (ORACLE_HOME=с:\app\oracle_db\product\12.1.0\dbhome_1)
  (PROGRAM=dg4odbc)
LISTENER =
  (DESCRIPTION_LIST =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
  (ADDRESS = (PROTOCOL = TCP)(HOST = Indas-debug)(PORT = 1521))
6) Сontent of the file "с:\app\oracle_db\product\12.1.0\dbhome_1\network\admin\tnsnames.ora"
ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
  (ADDRESS_LIST =
  (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
  (CONNECT_DATA =
  (SID = CLRExtProc)
  (PRESENTATION = RO)
ORCL =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = Indas-debug)(PORT = 1521))
  (CONNECT_DATA =
  (SERVER = DEDICATED)
  (SERVICE_NAME = orcl)
aof_Raport =
  (DESCRIPTION=
  (ADDRESS=(PROTOCOL=tcp)(HOST= localhost)(PORT=1521))
  (CONNECT_DATA=(SID = AOF_Raport))
  (HS=OK)
aof_Statistic =
  (DESCRIPTION=
  (ADDRESS=(PROTOCOL=tcp)(HOST= localhost)(PORT=1521))
  (CONNECT_DATA=(SID = AOF_Statistic))
  (HS=OK)
7) Created public links:
CREATE PUBLIC DATABASE LINK aof_Statistic CONNECT TO "ascub" IDENTIFIED BY "111**" using 'aof_Statistic';
CREATE PUBLIC DATABASE LINK aof_Raport CONNECT TO "ascub" IDENTIFIED BY "111**" using 'aof_Raport';
8)created pl sql package "test_sql_hs" with following code:
procedure raport_rep_L337_3 is
  l_dt date;
begin
  ---- table L337 from AOF_RAPORT
  for cur1 in (select
  to_date(TO_CHAR("DateAndTime", 'DD.mm.YYYY HH24:MI:SS'),'DD.mm.YYYY HH24:MI:SS') as DateAndTime,
  "D3_Q" as d3_q,
  "D5_Q" as d5_q,
  "D7_Q" as d7_q,
  "D9_Q" as d9_q,
  to_number("D11_Q") as d11_q,
  to_number("D13_Q") as d13_q,
  to_number("Work_Time") as work_time
  from L337_3@AOF_RAPORT
  where "DateAndTime"> (l_dt-1)
  order by "DateAndTime" asc ) loop
  begin
  insert into TB$A$L337 (dateandtime,d3_q,d5_q,d7_q,d9_q ,d11_q,d13_q,work_time,UPDATE_TIME)
  values(cur1.dateandtime,cur1.d3_q,cur1.d5_q,cur1.d7_q,cur1.d9_q ,cur1.d11_q,cur1.d13_q,cur1.work_time,sysdate);
  exception when dup_val_on_index then null;
  update TB$A$L337 t set t.update_time=sysdate where t.dateandtime=cur1.dateandtime;
  end;
end loop;
commit;
exception when others then
  rollback;
  sys_log(p_oid => 'raport_rep_L337', content => sqlerrm);
  raise;
end;
procedure static_rep_L337_3 is
  l_dt date;
begin
  ---- table L337 from AOF_RAPORT
  for cur1 in (select
  to_date(TO_CHAR("DateAndTime", 'DD.mm.YYYY HH24:MI:SS'),'DD.mm.YYYY HH24:MI:SS') as DateAndTime,
  "D3_Q" as d3_q,
  "D5_Q" as d5_q,
  "D7_Q" as d7_q,
  "D9_Q" as d9_q,
  to_number("D11_Q") as d11_q,
  to_number("D13_Q") as d13_q,
  to_number("Work_Time") as work_time
  from L337_3@AOF_STATISTIC
  where "DateAndTime"> (l_dt-1)
  order by "DateAndTime" asc ) loop
  begin
  insert into TB$A$L337 (dateandtime,d3_q,d5_q,d7_q,d9_q ,d11_q,d13_q,work_time,UPDATE_TIME)
  values(cur1.dateandtime,cur1.d3_q,cur1.d5_q,cur1.d7_q,cur1.d9_q ,cur1.d11_q,cur1.d13_q,cur1.work_time,sysdate);
  exception when dup_val_on_index then null;
  update TB$A$L337 t set t.update_time=sysdate where t.dateandtime=cur1.dateandtime;
  end;
end loop;
commit;
exception when others then
  rollback;
  sys_log(p_oid => 'raport_rep_L337', content => sqlerrm);
  raise;
end;
procedure rep_MSSQL_140 is
begin
raport_rep_L337_3;
static_rep_L337_3
exception when others then
  rollback;
end;
9) Created JOB which runs every 30 seconds function: test_sql_hs.rep_MSSQL_140
begin
  sys.dbms_job.submit(job => :job,
  what => 'begin
test_sql_hs.rep_mssql_140;
exception when others then
rollback;
end;',
  next_date => sysdate,
  interval => 'sysdate+30/(24*60*60)');
  commit;
end;
PROBLEM IS:
Initially JOB runs normally, but after 12 hours of working errors occure:
1)code test_sql_hs.rep_mssql_140 returns error: "ORA-28511: lost RPC connection to heterogeneous remote agent using ..." permanently.
2) At the same time I can not login to OS using any windows account, I get error "Access denied". I have "lack of resources" message in Windows system log.
The problem disappears only when I reboot Windows service "OracleOraDB12Home1TNSListener" (process TNSLSNR.exe).
Any idea of this issue please let me know.

Answer 1

Hi,
  You say you start the job every 30 seconds and you have resource problems after about 12 hours as well as an ORA-28511 error.  That error indicates the connection between the gateway and SQL*Server has been lost for some reason.
To follow up -
- do you see any messages in the RDBMS alert log ?
- how many DG4ODBC processes do you see if you look at Task Manager ?
Although you have a 'commit' in the PL/SQL procedure it could be that the actual DG4ODBC connection is not being closed every time it is run.
What you could try is an explicit 'close database link AOF_STATISTIC' in the code after the 'commit' statement.  This will cause the DG4ODBC process opened for the connection to be closed and a new one opened next time it is called.  This should prevent any resource problems if that is the cause of the problem.
Regards,
Mike