Will insert (ignore duplicates) have a better performance than merge?

Will insert (ignore duplicates) have a better performance than merge (insert if not duplicate)?

Ok. Here is exactly what is happenning -
We had a table with no unique index on it. We used 'insert all' statement to insert record.
But later when we found duplicates in there we started removing them manually.
Now, to resolve the issue we added unique index and added exception handling to ignore DUP_VAL_ON_INDEX exception.
But with this all records being inserted by 'INSERT ALL' statement gets ignored even if only one record is duplicate.
Hence we have finally replaced 'insert all' with merge statement. Which inserts only if a corresponding record is not found (match based on column in unique index) in the table.
But I am wondering how much performance will get impacted.

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    Illustration:
    TABLE_A
    STUDENT_ID GROUP_ID
    101 200
    101 201
    103 200
    107 201
    and so on.
    Here, when I try to insert a set of records like
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    108 200
    101 300
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    103 201
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    If I include 'NOT EXISTS' after insert and before
    select statement, it throws the error
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    Hello !
    I'm using entity framework , and I have several cases where I should run a query than return some parent items , and after I display these parents and the related children  in one report.
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    Method2:
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    .Include(Function(t2) t2.Childs1) _
    .Include(Function(t2) t2.Childs2) _
    .Include(Function(t2) t2.Childs2.Child22) _
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    Method3:
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    Thank you !

    Hello,
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    >>Also I read somewhere that Include() cause repeat of parent items?
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  • Any general tips on getting better performance out of multi table insert?

    I have been struggling with coding a multi table insert which is the first time I ever use one and my Oracle skills are pretty poor in general so now that the query is built and works fine I am sad to see its quite slow.
    I have checked numerous articles on optimizing but the things I try dont seem to get me much better performance.
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    its an insert all command, which ends up inserting into 5 separate tables, conditionally (at least 4 inserts, sometimes 5 but the fifth is the smallest table). Some stats on these tables as follows:
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    Target table 1: 0 rows, 27 columns wide. Parallel 4. everything else default.
    Target table 2: 0 rows, 63 columns wide. Parallel 4. default.
    Target table 3: 0 rows, 33 columns wide. Parallel 4. default.
    Target table 4: 0 rows, 9 columns wide. Parallel 4. default.
    Target table 5: 0 rows, 13 columns wide. Parallel 4. default.
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    into table1 (...) values (...)
    into table2 (...) values (...)
    when a=b then
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    when a=c then
    into table3 (...) values (...)
    when p=q then
    into table4(...) values (...)
    when x=y then
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    Edited by: trant on Jun 27, 2011 9:29 PM

    Looks like there are about 54 sessions on my database, 7 of the sessions belong to me (2 taken by TOAD and 4 by my parallel slave sessions and 1 by the master of those 4)
    In v$session_event there are 546 rows, if i filter it to the SIDs of my current session and order my micro_wait_time desc:
    510     events in waitclass Other     30670     9161     329759     10.75     196     3297590639     1736664284     1893977003     0     Other
    512     events in waitclass Other     32428     10920     329728     10.17     196     3297276553     1736664284     1893977003     0     Other
    243     events in waitclass Other     21513     5     329594     15.32     196     3295935977     1736664284     1893977003     0     Other
    223     events in waitclass Other     21570     52     329590     15.28     196     3295898897     1736664284     1893977003     0     Other
    241     row cache lock     1273669     0     42137     0.03     267     421374408     1714089451     3875070507     4     Concurrency
    241     events in waitclass Other     614793     0     34266     0.06     12     342660764     1736664284     1893977003     0     Other
    241     db file sequential read     13323     0     3948     0.3     13     39475015     2652584166     1740759767     8     User I/O
    241     SQL*Net message from client     7     0     1608     229.65     1566     16075283     1421975091     2723168908     6     Idle
    241     log file switch completion     83     0     459     5.54     73     4594763     3834950329     3290255840     2     Configuration
    241     gc current grant 2-way     5023     0     159     0.03     0     1591377     2685450749     3871361733     11     Cluster
    241     os thread startup     4     0     55     13.82     26     552895     86156091     3875070507     4     Concurrency
    241     enq: HW - contention     574     0     38     0.07     0     378395     1645217925     3290255840     2     Configuration
    512     PX Deq: Execution Msg     3     0     28     9.45     28     283374     98582416     2723168908     6     Idle
    243     PX Deq: Execution Msg     3     0     27     9.1     27     272983     98582416     2723168908     6     Idle
    223     PX Deq: Execution Msg     3     0     25     8.26     24     247673     98582416     2723168908     6     Idle
    510     PX Deq: Execution Msg     3     0     24     7.86     23     235777     98582416     2723168908     6     Idle
    243     PX Deq Credit: need buffer     1     0     17     17.2     17     171964     2267953574     2723168908     6     Idle
    223     PX Deq Credit: need buffer     1     0     16     15.92     16     159230     2267953574     2723168908     6     Idle
    512     PX Deq Credit: need buffer     1     0     16     15.84     16     158420     2267953574     2723168908     6     Idle
    510     direct path read     360     0     15     0.04     4     153411     3926164927     1740759767     8     User I/O
    243     direct path read     352     0     13     0.04     6     134188     3926164927     1740759767     8     User I/O
    223     direct path read     359     0     13     0.04     5     129859     3926164927     1740759767     8     User I/O
    241     PX Deq: Execute Reply     6     0     13     2.12     10     127246     2599037852     2723168908     6     Idle
    510     PX Deq Credit: need buffer     1     0     12     12.28     12     122777     2267953574     2723168908     6     Idle
    512     direct path read     351     0     12     0.03     5     121579     3926164927     1740759767     8     User I/O
    241     PX Deq: Parse Reply     7     0     9     1.28     6     89348     4255662421     2723168908     6     Idle
    241     SQL*Net break/reset to client     2     0     6     2.91     6     58253     1963888671     4217450380     1     Application
    241     log file sync     1     0     5     5.14     5     51417     1328744198     3386400367     5     Commit
    510     cursor: pin S wait on X     3     2     2     0.83     1     24922     1729366244     3875070507     4     Concurrency
    512     cursor: pin S wait on X     2     2     2     1.07     1     21407     1729366244     3875070507     4     Concurrency
    243     cursor: pin S wait on X     2     2     2     1.06     1     21251     1729366244     3875070507     4     Concurrency
    241     library cache lock     29     0     1     0.05     0     13228     916468430     3875070507     4     Concurrency
    241     PX Deq: Join ACK     4     0     0     0.07     0     2789     4205438796     2723168908     6     Idle
    241     SQL*Net more data from client     6     0     0     0.04     0     2474     3530226808     2000153315     7     Network
    241     gc current block 2-way     5     0     0     0.04     0     2090     111015833     3871361733     11     Cluster
    241     enq: KO - fast object checkpoint     4     0     0     0.04     0     1735     4205197519     4217450380     1     Application
    241     gc current grant busy     4     0     0     0.03     0     1337     2277737081     3871361733     11     Cluster
    241     gc cr block 2-way     1     0     0     0.06     0     586     737661873     3871361733     11     Cluster
    223     db file sequential read     1     0     0     0.05     0     461     2652584166     1740759767     8     User I/O
    223     gc current block 2-way     1     0     0     0.05     0     452     111015833     3871361733     11     Cluster
    241     latch: row cache objects     2     0     0     0.02     0     434     1117386924     3875070507     4     Concurrency
    241     enq: TM - contention     1     0     0     0.04     0     379     668627480     4217450380     1     Application
    512     PX Deq: Msg Fragment     4     0     0     0.01     0     269     77145095     2723168908     6     Idle
    241     latch: library cache     3     0     0     0.01     0     243     589947255     3875070507     4     Concurrency
    510     PX Deq: Msg Fragment     3     0     0     0.01     0     215     77145095     2723168908     6     Idle
    223     PX Deq: Msg Fragment     4     0     0     0     0     145     77145095     2723168908     6     Idle
    241     buffer busy waits     1     0     0     0.01     0     142     2161531084     3875070507     4     Concurrency
    243     PX Deq: Msg Fragment     2     0     0     0     0     84     77145095     2723168908     6     Idle
    241     latch: cache buffers chains     4     0     0     0     0     73     2779959231     3875070507     4     Concurrency
    241     SQL*Net message to client     7     0     0     0     0     51     2067390145     2000153315     7     Network
    (yikes, is there a way to wrap that in equivalent of other forums' tag?)
    v$session_wait;
    223     835     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     10     WAITING
    241     22819     row cache lock     cache id     13     000000000000000D     mode     0     00     request     5     0000000000000005     3875070507     4     Concurrency     -1     0     WAITED SHORT TIME
    243     747     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     7     WAITING
    510     10729     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     2     WAITING
    512     12718     PX Deq Credit: send blkd     sleeptime/senderid     268697599     000000001003FFFF     passes     1     0000000000000001     qref     0     00     1893977003     0     Other     0     4     WAITING
    v$sess_io:
    223     0     5779     5741     0     0
    241     38773810     2544298     15107     27274891     0
    243     0     5702     5688     0     0
    510     0     5729     5724     0     0
    512     0     5682     5678     0     0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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    What is the best way to do that?
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    There is no such thing as the best channel..
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    <i>Please suggest me which method (is Helper classes or Using EJBs) is perferable :
    1) to get better performance</i>
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    <i>2) for less network traffic</i>
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    Limited memory. 32 GB is around bare minimum for a dual processor system.
    Outdated Quadro 4000 card, which is very slow in comparison to newer cards and is generally not used when transcoding.
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