DDL - locking problem

I am using Oracle 9i database on Windows 2000 server. I am facing extreme difficulty in running DDL commands, when trying to alter tables.
A form is using a table xyz, and i have opened the form in developer 6i, then made some cosmetic changes and then saved and closed the fmb file.
Now when I am trying to add a column in the same table, it goes into a hang. If I exit forms builder (i.e. disconnect from the connection which had once used that table), the DDL quickly executes. Similar is the problem when trying to drop/create/alter triggers.
I am unable to figure out why Oracle has locked the object which was being referred in the form. I am facing severe problems at the customer site, when we make modifications to the production database, and when trying to replicate the schema changes in the live database, all the users have to be logged out (including exiting the report background engine!!) for the DDL execution to take place.
In case somebody has faced this problem, or if aware of the cause/remedy, pls reply.
Thanks in advance

I think it is a privilege issue. I can run that statement without problems when I connect with near dba permissions on 9iR2 and 10gXE, but it gives the same error when I execute under a normal user.

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I can see related information by querying DBA_DDL_LOCKS view, but it doesn't give me the information which tables are having DDL locks.
Is there a way I can find out which tables are having DDL locks?
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Here's a long script written back in 2001. Still works:
BREAK on sid on serial# on username
COL sid        for 9999
COL serial#    for 99999
COL username   for a20
COL type       for a20    trunc
COL lmode      for a5     trunc
COL lrequest   for a4     trunc
COL detail     for a75    trunc
SELECT   s.sid
       , s.serial#
       , s.username
       , DECODE(
              l.TYPE
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            , 'TM', 'dml/data enq (TM)'
            , 'TX', 'transac enq (TX) '
            , 'UL', 'pls usr lock (UL)'
            -- Short locks
            , 'BL', 'buf hash tbl (BL)'
            , 'CF', 'control file (CF)'
            , 'CI', 'cross inst f (CI)'
            , 'CU', 'cursor bind (CU) '
            , 'DF', 'data file (CF)   '
            , 'DL', 'direct load (DL) '
            , 'DM', 'mount/strtup (DM)'
            , 'DR', 'reco lock (DR)   '
            , 'DX', 'distrib tran (DX)'
            , 'FI', 'sga opn file (FI)'
            , 'FS', 'file set (FS)    '
            , 'IN', 'instance num (IN)'
            , 'IR', 'instce recvr (IR)'
            , 'IS', 'get state (IS)   '
            , 'IV', 'libcache inv (IV)'
            , 'JQ', 'job queue (JQ)   '
            , 'KK', 'log sw kick (KK) '
            , 'LS', 'log switch (LS) '
            , 'MM', 'mount def (MM)   '
            , 'MR', 'media recvry (MR)'
            , 'PF', 'pwfile enq (PF) '
            , 'PR', 'process strt (PR)'
            , 'RW', 'row wait (RW)    '
            , 'RT', 'redo thread (RT) '
            , 'SC', 'scn enq (SC)     '
            , 'SM', 'smon lock (SM)   '
            , 'SN', 'seqno instce (SN)'
            , 'SQ', 'seqno enq (SQ)   '
            , 'ST', 'space transc (ST)'
            , 'SV', 'seqno value (SV) '
            , 'TA', 'generic enq (TA) '
            , 'TD', 'dll enq (TD)     '
            , 'TE', 'extend seg (TE) '
            , 'TS', 'temp segment (TS)'
            , 'TT', 'temp table (TT) '
            , 'UN', 'user name (UN)   '
            , 'WL', 'write redo (WL) '
            , 'TYPE = ' || l.TYPE) AS type
       , DECODE(l.lmode, 0, 'none', 1, 'null', 2, 'RS', 3, 'RX', 4, 'S', 5, 'SRX', 6, 'X', TO_CHAR(l.lmode)) A
S lmode
       , DECODE(l.request, 0, 'none', 1, 'null', 2, 'RS', 3, 'RX', 4, 'S', 5, 'SRX', 6, 'X', TO_CHAR(l.request
)) AS lrequest
       , DECODE(
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            , 'MR', DECODE(s.user_type, 'BG', 'DICTIONARY OBJECT', LOWER(obj.owner) || '.' || LOWER(obj.name))
|| ' (' || LOWER(obj.TYPE) || ')'
            , 'RT', 'thread #' || LOWER(l.id1)
            , 'RW', 'file#' || LOWER(SUBSTR(l.id1, 1, 3)) || ', block#' || LOWER(SUBSTR(l.id1, 4, 5)) || ', ro
w#' || LOWER(l.id2)
            , 'TD', 'object: ' || LOWER(obj.owner) || '.' || LOWER(obj.name) || ' (' || LOWER(obj.TYPE) || ')'
            , 'TM', 'object: ' || LOWER(obj.owner) || '.' || LOWER(obj.name) || ' (' || LOWER(obj.TYPE) || ')'
            , 'TS', DECODE(l.id2, 0, 'enqueue', 'new block allocation')
            , 'TX', DECODE(
                         lo.object_name
                       , NULL, 'rbs #' || TRUNC(l.id1 / 65536) || ', slot #' || LOWER(l.id1)
                       , 'rbs #' || TRUNC(l.id1 / 65536) || ', slot #' || LOWER(l.id1) || ', object: ' || LOWE
R(lo.object_name))
            , 'UL', 'lock name: ' || la.name || ', expiration date: ' || TO_CHAR(la.expiration, 'DD-MON-RR HH2
4:MI:SS')
            , 'WL', 'redo log file#' || LOWER(l.id1)
            , 'id1 = ' || l.id1 || ', id2 = ' || l.id2) AS detail
    FROM sys.v_$lock l
       , (SELECT a.sid
               , a.serial#
               , NVL(a.username, 'SYS (' || LOWER(b.name) || ')') AS username
               , DECODE(a.username, NULL, 'BG', 'USER') AS user_type
            FROM sys.v_$session a
               , sys.v_$bgprocess b
           WHERE a.paddr = b.paddr(+)) s
       , (SELECT o.obj#
               , u.name AS owner
               , o.name
               , DECODE(
                      o.type#
                    , 0, 'NEXT OBJECT'
                    , 1, 'INDEX'
                    , 2, 'TABLE'
                    , 3, 'CLUSTER'
                    , 4, 'VIEW'
                    , 5, 'SYNONYM'
                    , 6, 'SEQUENCE'
                    , 7, 'PROCEDURE'
                    , 8, 'FUNCTION'
                    , 9, 'PACKAGE'
                    , 11, 'PACKAGE BODY'
                    , 12, 'TRIGGER'
                    , 13, 'TYPE'
                    , 14, 'TYPE BODY'
                    , 19, 'TABLE PARTITION'
                    , 20, 'INDEX PARTITION'
                    , 22, 'LIBRARY'
                    , 23, 'DIRECTORY'
                    , 24, 'QUEUE'
                    , 28, 'JAVA SOURCE'
                    , 29, 'JAVA CLASS'
                    , 30, 'JAVA RESOURCE'
                    , 32, 'INDEXTYPE'
                    , 33, 'OPERATOR'
                    , 34, 'TABLE SUBPARTITION'
                    , 35, 'INDEX SUBPARTITION'
                    , 39, 'LOB PARTITION'
                    , 40, 'LOB SUBPARTITION'
                    , 43, 'DIMENSION'
                    , 44, 'CONTEXT'
                    , 47, 'RESOURCE PLAN'
                    , 48, 'CONSUMER GROUP'
                    , 51, 'SUBSCRIPTION'
                    , 52, 'LOCATION'
                    , 'UNDEFINED') AS type
            FROM sys.obj$ o
               , sys.user$ u
           WHERE o.owner# = u.user#) obj
       , (SELECT vlo.xidusn
               , vlo.xidslot
               , vlo.xidsqn
               , vlo.process
               , o.owner || '.' || o.object_name AS object_name
            FROM sys.v_$locked_object vlo
               , sys.dba_objects o
           WHERE vlo.object_id = o.object_id) lo
       , (SELECT job
               , schema_user AS username
               , what
            FROM dba_jobs) j
       , sys.dbms_lock_allocated la
   WHERE l.sid = s.sid
     AND l.id1 = obj.obj#(+)
     AND l.id2 = j.job(+)
     AND TRUNC(l.id1 / 65536) = lo.xidusn(+)
     AND LOWER(l.id1) = lo.xidslot(+)
     AND l.id2 = lo.xidsqn(+)
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     AND l.TYPE != 'MR'
UNION ALL
                  /*** LATCH HOLDERS ***/
SELECT   s.sid
       , s.serial#
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       , 'latch'
       , 'X'
       , 'none'
       , h.name || ' addr=' || LOWER(RAWTOHEX(laddr)) AS object
    FROM sys.v_$process p
       , sys.v_$session s
       , sys.v_$latchholder h
   WHERE h.pid = p.pid
     AND p.addr = s.paddr
UNION ALL
                  /*** LATCH WAITERS ***/
SELECT   s.sid
       , s.serial#
       , s.username
       , 'latch'
       , 'none'
       , 'X'
       , name || ' latch=' || p.latchwait AS object
    FROM sys.v_$session s
       , sys.v_$process p
       , sys.v_$latch l
   WHERE latchwait IS NOT NULL
     AND p.addr = s.paddr
     AND p.latchwait = l.addr
ORDER BY sid
       , serial#
       , username
       , 4
       , 5
       , 6
       , 7;

How to query DDL locks on stored procedures/functions and packages?

Hi!
The subject says it all: How do I see existing DDL locks on stored procedures/functions and packages?
While a procedure is executed it can't be deleted or replaced, so there has to be a DDL lock on it. The information does not seem to be in V$LOCK or V$LOCKED_OBJECTS.
Thanks!
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Edited by: MMarcus on Nov 21, 2009 3:43 PM

Hello,
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[http://www.praetoriate.com/int_40.htm]
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Oracle acquires a dictionary lock automatically on behalf of any DDL transaction requiring it. Users cannot explicitly request DDL locks. Only individual schema objects that are modified or referenced are locked during DDL operations. The whole data dictionary is never locked
DDL locks fall into three categories: exclusive DDL locks, share DDL locks, and breakable parse locks.
see this link
http://www.sc.ehu.es/siwebso/KZCC/Oracle_10g_Documentacion/server.101/b10743/consist.htm#i5281

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Object o = uow.readObject(...
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==========================
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=================
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Duplicate posting Pessimistic lock problem with Sybase

DDL 작업 시 LOCK 문제 해결 예제

제품 : ORACLE SERVER
작성날짜 : 2002-04-09
DDL 작업 시 LOCK 문제 해결 예제
===============================
DDL lock은 다중 사용자의 DDL command로부터 database의 schema
object를 보호하기 위하여 사용되는 lock으로 schema object(table,
procedure,package, view, synonym, trigger, function package body,
cluster)를 생성하거나 삭제할 때 발생한다.
간혹 이러한 compile이나 grant작업중 library cache lock(also called
breakable parse lock)을 점유하지 못하여 작업이 되지 않는 경우가
발생하게 되는데 이러한 경우 dynamic view 의 DDL lock 정보를 조회하여
문제 해결을 할 수가 있다. 다음은 lock monitoring view 생성 및 blocking
lock에 대한 예와 그 해결 방법에 대한 내용이다.
[Dynamic tables]
DBA_DDL_LOCKS : database의 모든 DDL lock에 대한 상태 정보
DBA_LOCK_INTERNAL : library cache lock에 대한 상태 정보
[Dynamic table 생성]
sys user(svrmgrl)로 $ORACLE_HOME/rdbms/admin/catblock.sql을 실행
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procedure에 대한 DDL작업을 방해하는 예이다.
(마찬가지로 long running query가 수행되고 있는 procedure에 대한 grant,
compile과 같은 작업이 방해 받는 경우 역시 아래의 방법에 따라 그 원인을
확인해 볼 수 있다.
이때의 해결방법은 수행중인 procedure가 종료될 때 까지 기다리거나 kill
시키는 방법이 있겠다.)
[Blocking DDL lock 발생]
session A :
SQL> create or replace procedure delemp(no IN number) is
begin
delete emp where empno = no;
end;
SQL> exec delemp(7900);
(emp table에 대하여 table lock 및 TX lock이 점유된다.)
session B :
SQL> exec delemp(7900);
| <= hangup
(session A에서 선점된 TX lock이 release될 때까지 waiting 상태를
갖게 되며 share mode library cache lock이 점유된다.)
session C :
SVRMGR> connect internal
SVRMGR> select session_id, substr(lock_type, 1, 10),
substr(mode_held, 1, 10),
substr(mode_requested, 1, 15), substr(lock_id1, 1, 40),
substr(lock_id2, 1, 10)
from dba_lock_internal;
10 Transactio None Exclusive 65538 1904
10 Table/Proc Share None SCOTT.DELEMP 31FBC1D8
session D :
SQL> drop procedure delemp;
| <= hangup
session C :
SQL> select session_id, substr(lock_type, 1, 10), substr(mode_held, 1,
10),
substr(mode_requested, 1, 15), substr(lock_id1, 1, 40),
substr(lock_id2, 1, 10)
from dba_lock_internal;
10 Table/Proc Null None SCOTT.DELEMP 31FBC1D8
10 Table/Proc Share None SCOTT.DELEMP 31FBC1D8
13 Table/Proc Exclusive None SCOTT.DELEMP 31FBC1D8
13 Table/Proc None Exclusive SCOTT.DELEMP 31FBC1D8
SQL> select session_id, substr(name, 1, 15), substr(type, 1, 10),
substr(mode_held, 1, 15), substr(mode_requested, 1, 15)
from dba_ddl_locks;
10 DELEMP Table/Proc Null None
12 DELEMP Table/Proc Null None
13 DELEMP Table/Proc Null None
13 DELEMP Table/Proc Exclusive None
(session D에 의해 점유된 DDL lock이 dba_ddl_locks에서 확인되나 waiting
session은 확인이 되지 않고 있으나 DBA_LOCK_INTERNAL에서는 blocking
lock과 waiting lock이 확인되고 있다.)
session E:
SQL> alter procedure delemp compile;
| <= hangup
session C :
9 DELEMP Table/Proc None Exclusive
13 DELEMP Table/Proc Exclusive None
(session D에 의해 선점된 DDL lock으로 인해 session E의 DDL lock이
waiting 상태에 있다.)
[lock conflict 해결]
이제까지 dba_lock_internal와 dba_ddl_locks을 조회하여 internal lock 및
DDL lock에 대하여 확인해 보았다. 이 예의 경우는 개발 작업 시 일어날 수
있는 상황을 재현해 본 것으로 해결 방법은 선점된 lock을 잡고 있는 session
을 찾아 lock을 release해주는 것이다.
이 경우에서의 최선의 해결책은 선점된 DML locking session을 찾아 commit
이나 rollback을 시키는 것이다.
다음은 위에서 예로 든 상황에 대한 해결 과정이다.
SQL> select object_id, object_type
from dba_objects
where object_name = 'EMP' and owner = 'SCOTT';
SQL> select * from v$lock where type in ('TM', 'TX');
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
30199BBC 30199BD0 10 TM 4769 0 3 0 2919 0
30176508 30176518 10 TX 65580 1908 0 6 2919 0
10364FE0 103650AC 12 TX 65580 1908 6 0 2946 1
30199B48 30199B5C 12 TM 4769 0 3 0 2946 0
조회 결과 object_id에 대하여 TM lock을 잡고 있는 session 중 TX lock을
선점한 session id가 12인 것을 알 수 있다.
session 12에서 TX commit을 발행하면 blocking lock이 release되고 DDL
작업들이 이루어진다.

Dead lock problem occur in Ms-Sql Server

Hi friends,
I am using the 1,Tomcat server
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exception . How to solve the dead lock problem.. please help it.
Can i modify the Db connection?
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I am using this stored procedure to occur dead lock condtion. Orderly insert table values ..
Imm_tblGameTransactions- Primary Tables
Imm_tblGameDetailsBJ - Secondary tables
Please check it.....
Please explain breifly..... ....
please.........
CREATE procedure IMM_BJDeal
 @plid int,
 @gameid int,
 @betamt money,
 @bal money,
 @winamt money,
 @usercards nvarchar(500),
 @dealercards nvarchar(500),
 @useracecnt int,
 @dealeracecnt int,
 @dealerbj int,
 @userbj int,
 @insurance int,
 @split int,
 @push int,
 @sessionid int,
 @ltransid int out
as
 begin
 declare
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 @linitbal money,
 @lfinalbal money,
 @errormesg varchar(50)
 select @linitbal=balance from Imm_players.dbo.Imm_tblPlayerbalance where playerid=@plid
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 begin
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 ROLLBACK
 return
 end
 update Imm_players.dbo.Imm_tblPlayerbalance set balance=@lfinalbal where playerid=@plid
 IF @@ERROR <> 0
 begin
 -- There's an error b/c @ERROR is not 0, rollback
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 return
 end
 commit transaction
 return
 end
 else
 begin
 begin transaction
 insert into Imm_tblGameTransactions(playerid,gameid,Initialbalance,transactiondate,betamount,winamount,currencycode,finalbalance,sessionid)
 values(@plid,@gameid,@linitbal,@transdate,@betamt,@winamt,'USD',@bal,@sessionid)
 IF @@ERROR <> 0
 Begin
 -- There's an error b/c @ERROR is not 0, rollback
 ROLLBACK
 return
 End
 /*ELSE
 COMMIT -- Success! Commit the transaction*/
 select @ltransid=@@identity from Imm_tblGameTransactions
 insert into Imm_tblGameDetailsBJ(transid,playercard,dealercard,typeid,result,split,insurance,playercardcount,dealercardcount,winvalue,betvalue,statusid)
 values(@ltransid,@usercards,@dealercards,1,3,@split,@insurance,@useracecnt,@dealeracecnt,@winamt,@betamt,'G')
 IF @@ERROR <> 0
 Begin
 -- There's an error b/c @ERROR is not 0, rollback
 ROLLBACK
 return
 End
 /*ELSE
 COMMIT -- Success! Commit the transaction*/
 commit transaction
 return
 end
end
GO

Locking problem in BPS solution not getting solved using RSPLSE. SEM_BPS_S

Can anyone tell me exactly what "rsplse" offers to solve locking in BPS?
We have made correct selection of characteristics (in our case "costcentre" infoobject) in tab "Lock characteristics" , but still when two people are trying to access (write) data in the same transactional cube against the different cost centres, the system is throwing an error message Cube zIC_ccp is locked by username. (Or if a single person is using the two packages simultaneously using two web sessions , he is getting the same error. )
Our assessment is that he should not be facing this locking problem because cost centres here are acting as a key to different selection as configured in rsplse.
Can anyone tell me how to use parameter SEM_BPS_SAVE_UNLOCK. I want to know t. code and other t . code and other details to execute SEM_BPS_SAVE_UNLOCK.

Hi,
Please check the OSS note 635244.
From the OSS note :
 Notes on SET/GET parameters SEM_BPS_NO_LOCK, SEM_BPS_SAVE_UNLOCK :
These two parameters have nothing to do with the problem described above. They are only designed to facilitate the Customizing process, if users carry out Customizing in t ransaction BPS0 within a project.
SEM_BPS_NO_LOCK: This parameter has the effect that transaction data is not locked at all. Never use this parameter in a production system. As of Support Package 14 for Release 3.1B, parameter SEM_BPS_NO_LOCK is released by an additional switch in table upc_dark2: For this purpose you have to maintain a record with param = ENABLE_NO_LOCK and value = X in table upc_dark2. Only then the system includes parameter SEM_BPS_NO_LOCK. The parameter can then be useful if you want to test functions or the manual planning with 'test data' in Customizing.
SEM_BPS_SAVE_UNLOCK: This parameter only works in transaction BPS0; it has the effect that the system unlocks data (if possible) after it has been saved. Therefore, the system only simulates an exit and reentry in transaction BPS0 with the last active detail application. Therefore, the above parameter can be helpful if many people work on Customizing in transaction BPS0, because objects can be unlocked earlier.
Regards,
Siva.

Article says K8N Neo has SATA frequency locking problem

This article says that the K8N Neo has SATA frequency locking problems when overclocking:
http://www.nforcershq.com/modules.php?name=News&file=article&sid=1801
First of all, is this true?
And if it is true, do we have a BIOS that fixed this problem.
My drives are PATA right now so I currently don't have any problems but I plan to get SATA drives/adapters soon.
I'm running 240 HTT (1:1) so not having the SATA frequency locked could be an issue.

Well, I´m running HTT 230 now, and I´m always using my Raptor as OS disk. Haven´t had any problems yet (with my disk). It´s connected to s-ata_1. Haven´t tried the other ones.
But sometimes when I boot (200 or 230HTT, doesn´t matter) I get artifacts on the boot screen and in Windows, so I have to restart.
Could it be a partially working AGP-lock? It seems as at works most of the time, but sometimes not... Strange... AGP is set to 66-67MHz

Locking problems... Help me...

I am a novice...
But I have a locking problem..
First, OneRecord A is locked,
Second, OneRecord A is also locked...
Third, OneRecord A is also locked..
But if OneRecord A is unlocked, then First, Second, Third All 3 OneRecord A is awaken...(because of same object....)
so Security exception happen...(because one.getCookie() is different from cookie )
I want to make a program in order...
First, OneRecord A is unlock....
Second, OneRecord A is unlock...
Third, OneRecord A is unlock..
What shoud i do?
Help is appreciated...
I am not a native speakek in English..
Plz...
public long lockRecord(long recNo) throws RecordNotFoundException
 int a = (int)recNo;
 if( a >= vecrecord.size() || a < 0) throw new RecordNotFoundException();
 OneRecord one = ((OneRecord)(vecrecord.elementAt(a)));
 if( one == null) throw new RecordNotFoundException();
 long cookie = 0L;
 synchronized(one)
 if(one.isLocked())
 try
 one.wait();
 catch(Exception e)
 cookie = Thread.currentThread().hashCode();
 one.setCookie(cookie);
 return cookie;
public void unlock(long recNo, long cookie) throws SecurityException, RecordNotFoundException
 int a = (int)recNo;
 if( a >= vecrecord.size()) throw new RecordNotFoundException();
 OneRecord one = ((OneRecord)(vecrecord.elementAt(a)));
 if( one == null) throw new RecordNotFoundException();
 synchronized(one)
 if(one.isLocked())
 if(one.getCookie() != cookie) throw new SecurityException();
 one.setCookie(0L);
 one.notify();
 } Edited by: KIMJINHO on Sep 8, 2008 1:56 PM

I did not really understand but you should call wait inside of a loop.
As the api for Object.wait says:
* As in the one argument version, interrupts and spurious wakeups are
* possible, and this method should always be used in a loopI hope this helps
Additionally you should not catch an Exception without doing anything. At least log it or write it to the console.
Edited by: Domi27 on Sep 8, 2008 4:18 PM

DDL - locking problem

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