Table physics lock

hi experts,
i create two wd projects and the storage is r3 tans.table,one for quanlity submit,one for the quanlity modify,i wanna know if i can lock the table when i open a project,and another project can not modify,update,insert datas into table
best regards,
zlf

Hi,
I think you no need to worry about the data consistency and concurency. Everything will be take care by backend systems.
Raghu

Similar Messages

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    Hello,
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    Olaf Helper
    [ Blog] [ Xing] [ MVP]

  • Unable to update, when executed table gets lock and Execution does not stop even for an hour.

    Following is my Query, which unables to update. When Executed, table gets lock and Execution does not stop even for an hour.
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          set Status = 'Close'
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                                             from MyView 
                                              where DownloadedDate ='2014-07-27 00:00:00.000'
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    , THANKS IN ADVANCE.

    See also your other thread with the same question:
    http://social.msdn.microsoft.com/Forums/en-US/80243625-fc3b-4ee1-bce1-4adcdbc16c14/unable-to-update-when-executed-table-gets-lock-execution-does-not-stop-execution-even-for-an-hour?forum=sqlserversamples
    Olaf Helper
    [ Blog] [ Xing] [ MVP]

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  • Buffer table and Locking issues

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  • While load is going on in r3 at the time table is locked

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    Hi All,
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    2. Change run already started by aleremote.in which sccenarion this type of problem will happens.
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    chandra.

  • Problems with the table of lock is fills

    Hello all
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  • 11g child table update locking

    Hi,
    I'm posting this question after searching on multiple places and trying to understand 11g locking mechanism.
    I've a table TXN1 transaction and has FKs to 3 different tables Account, customer, country and currency. ALL FKs are indexed (bitmap). I am updating TXN1 of amount column about 10,000 rows. (SID 1) As expected, it has taken lock type 3 SX on TXN1. But it has taken on lock type 4 (share) on Account, customer and country. Committing every 10k rows.
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    I understand update/delete in parent table results into locking of SX of child tables and need the FKs to be indexed to avoid etc. I didn't understand the following and appreciate if someone can help me.
    1. Why is SID1 taking shared lock on the parent tables Account,customer,country and currency tables? The update statement is not updating any of those FK columns nor referring them in where clause(if it matters!). Is it to ensure that the parent rows are not deleted?
    2. Why is SID2 taking SX lock on the dimension tables? Why is it not taking RS lock type 2 on parent rows? Why is SID1 taking shared lock type 4, but not 2?
    Thanks
    Ram
    Edited by: rkuppa on May 24, 2013 2:24 PM
    Edited by: rkuppa on May 24, 2013 2:25 PM
    Edited by: rkuppa on May 24, 2013 2:26 PM
    Edited by: rkuppa on May 24, 2013 2:33 PM
    Edited by: rkuppa on May 26, 2013 4:49 PM

    Table TxN(ac_id, cs_id, amt, amt_dollar), PK on ac_id,cs_id. constraint FK on ac_id to Table AC_DIM (ac_id, acctname), FK on cs_id to Table CST_DIM(cs_id, custname). These FK are bitmap indexed.
    Update qry: update TXN set amt_dollar =amt/1.1 where rownum<1000; commit; (sid 308)
    Table TXN2(ac_id, cs_id,ccy_id, amt, amt_dollar), PK on ac_id,cs_id,ccy_id. constraint FK on ac_id to Table AC_DIM (ac_id, acctname), FK on cs_id to Table CST_DIM(cs_id, custname), CCY_DIM(ccy_id). Only ac_id FK in the TXN2 table is indexed to bitmap.
    At the same time, another transaction is inserting into TXN2 1000 rows. (sid 127)
    SELECT l.sid, s.blocking_session blocker, SUBSTR(s.event,1,20),
    l.type, l.lmode, l.request, o.object_name, o.object_type
    FROM v$lock l, dba_objects o, v$session s
    WHERE UPPER(s.username) =  'MY_USER'
    AND l.id1 = o.object_id (+)
    AND l.sid = s.sid
    ORDER BY sid, type;
    SID     BLOCKER     SUBSTR(S.EVENT,1,20)     TYPE     LMODE     REQUEST     OBJECT_NAME     OBJECT_TYPE
    308          db file scattered re     AE     4     0     ORA$BASE     EDITION
    308          db file scattered re     TM     4     0     AC_DIM             TABLE
    308          db file scattered re     TM     4     0     CST_DIM             TABLE
    308          db file scattered re     TM     3     0     TXN             TABLE
    127     308     enq: TM - contention     AE     4     0     ORA$BASE     EDITION
    127     308     enq: TM - contention     TM     3     0     CCY_DIM             TABLE
    127     308     enq: TM - contention     TM     0     3     CST_DIM             TABLE
    *<< I don't see type 3 lock on AC_DIM for sid 127>>*
    SELECT
      S.SID,
      S.PROGRAM,
      S.SQL_HASH_VALUE,
      L.REQUEST,
      L.ID1,
      L.ID2,
      L.LMODE,
      L.TYPE,
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    FROM
      V$LOCK L,
      V$SESSION S
    WHERE
      (L.ID1, L.ID2, L.TYPE) IN
      (SELECT
        ID1,
        ID2,
        TYPE
      FROM
        V$LOCK
      WHERE
        REQUEST > 0)
      AND L.SID=S.SID;
    SID     PROGRAM                                      SQL_HASH_VALU REQUEST     ID1     ID2     LMODE     TYPE     BLOCK
    308     SQL Developer                            1733825831     0     509281     0     4     TM     1
    127     db-load.impl.n64@aittsmwp2 (TNS V1-V3)    4097376515     3     509281     0     0     TM     0Edited by: rkuppa on May 24, 2013 6:58 PM
    Edited by: rkuppa on May 24, 2013 7:12 PM
    Edited by: rkuppa on May 24, 2013 7:16 PM
    Edited by: rkuppa on May 26, 2013 4:42 PM
    Edited by: rkuppa on May 26, 2013 4:47 PM
    Edited by: rkuppa on May 26, 2013 4:55 PM

  • Please tell me SQL to see, what tables are locked by which user

    could you please tell me the query
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    Thanks

    The only way you can ensure that only one transaction touches the data at any one time is to use a select .. for update nowait statement to select the rows to be updated.
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      8 
      9   for rec in c
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    12    End Loop;
    13   
    14  DBMS_OUTPUT.PUT_LINE('Record Updated');
    15 
    16  EXCEPTION
    17 
    18  WHEN OTHERS THEN
    19 
    20  DBMS_OUTPUT.PUT_LINE(sqlcode || sqlerrm);
    21 
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    23  /
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    PL/SQL procedure successfully completed.Edited by: J99 on Jul 28, 2009 4:57 PM

  • Tables with locked stats

    Hi: I am on 10.2.0.3.
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    Greg

    You can find table lock details from dba_tables / all_tables check table_lock column
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  • Find out what tables are lock

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