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  • Outer Join Query Over Dblink Can Fail With ORA-904 (Doc ID 730256.1)

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    03-May-2013PROBLEM
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    In this Document

      Symptoms
      Changes
      Cause
      Solution
      References

    APPLIES TO:

    Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.1.0.7 [Release 10.2 to 11.1]
    Information in this document applies to any platform.

    SYMPTOMS


    Following query over dblink having Local database 9iR2 and remote 10gR2 works..

    select *
    from ctps3.institutions@ctps3 i,
    ctps3.state_types@ctps3 s,ods.institutions oi
    where s.stt_state_type_id (+) = i.stt_state_type_id
    and oi.ctps_insttn_id = i.inst_insttn_id
    and i.inst_modifd_dt = trunc(sysdate)
    and (nvl (oi.inst_state_txt, 'x') <> nvl (s.stt_state_type_nm, 'x'))
    and (nvl (oi.inst_phone_txt, 17) <> nvl (i.inst_phone_txt, 17));

    The same query fails when both local and remote databases are 10g R2, with following errors:

    ERROR at line 2:
    ORA-00904: "OI"."INST_STATE_TXT": invalid identifier
    ORA-02063: preceding line from CTPS3


     

    CHANGES

     

    CAUSE

    Outer join query over dblink can fail with ORA-904, as referenced in:

    BUG 6620988 QUERY OVER DBLINK FAILS WITH ORA-904 SELECTING DATE

    Predicates are not checked to verify if they belong to same network node when we attempt to colocate the remote tables. This results in wrongly generating remote query and ORA-904

    REDISCOVERY INFORMATION:
    1. ORA-904
    2. DB link
    3. OJ predicates across network nodes
    4. predicates wrongly pushed network nodes

     

    SOLUTION

    -- To implement the solution, please execute the following steps::

    Use the workaround of disabling colocated joins via event 10176 and force a hard parse to happen
    (ie by flushing the shared pool), ie:

    SQL> alter session set events '10176 trace name context forever';
    SQL> alter system flush shared_pool;

    or

    For a permanent fix, request a One-Off Backport of 6620988 for the appropiate platform.

     

    REFERENCES

    BUG:6620988 - QUERY OVER DBLINK FAILS WITH ORA-904 SELECTING DATE
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  • 原文地址:https://www.cnblogs.com/kevinsun/p/3772091.html
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