Query, stuck on the temp to write direct path after 11.1.0.7 to 11.2.0.4 upgrade

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• Insert adds parallel sessions expect "direct path read temp".

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  The database is 11.2.0.3 on a linux machine.
  
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• Wait events "direct path write" and "direct path read".

  Hello
  
  We have a query that takes more than 2 minutes. It's a 9.2.0.7 database. We took the request trace/tkprof and identified there so manay 'direct entry path' and 'direct path read' wait for events in the trace file.
  
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  Whatever it is:

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  back? I think, is that it returns 200.

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• Redo generation for Direct path Inserts

  Hello, I'm trying to understand some test results confused I see this morning on the generation of redo direct path for the pads. Based on my understanding of Tom to ask several discussions directly inserts path on a set of data to force the record should generate much less remake a traditional insert because the insertion of the direct route does not generate as much cancel which in turn should generate less do on cancellation.

  https://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:5280714813869

  Of course, always connect the actual inserted rows but I expected to the remake was less because less cancel has been generated. Instead the roll forward is actually bigger and I don't know why.

  Here's a test case to prove my example.

  set autotrace traceonly;
  create table test_redo as select * from all_tables where 1=0;
  insert into test_redo select * from all_tables;
  rollback;
  insert /*+ append */ into test_redo select * from all_tables;
  rollback;
  

  Stats without Append Hint
  
  Statistics
  ----------------------------------------------------------
          387  recursive calls
         1275  db block gets
        19604  consistent gets
            9  physical reads
      2409204  redo size
          501  bytes sent via SQL*Net to client
          897  bytes received via SQL*Net from client
            4  SQL*Net roundtrips to/from client
            4  sorts (memory)
            0  sorts (disk)
         9031  rows processed
  
  Stats with Append Hint
  
  Statistics
  ----------------------------------------------------------
           59  recursive calls
          162  db block gets
        18675  consistent gets
            0  physical reads
      2596904  redo size
          490  bytes sent via SQL*Net to client
          911  bytes received via SQL*Net from client
            4  SQL*Net roundtrips to/from client
            2  sorts (memory)
            0  sorts (disk)
         9031  rows processed
  

  Any ideas on what I'm missing?

  Thank you

  The / * + append * / copies all blocks Oracle in roll forward, with a little extra for recording etc. headers.

  The standard insert creates change descriptions which save odd odd little bits of space and adds little bits of information links (as well as some redo to describe a very small amount to cancel)...

  The difference between the two has always been pretty low (assuming that you are running in archivelog mode, or force logging) on a right append.  It is possible that curious little details of efficiencies in future versions of the average of the Oracle that the standard Insert wins a place a bit more efficient - it used to be the other way around in earlier versions.

  Concerning

  Jonathan Lewis

• With regard to 'Direct Path read' expected

  As we know, the direct path read waits is a new feature of Oracle 11 g. Oracle Documents or other objects, when it's the full table scan, direct path reading took place. But why it happened?  I don't know clearly.

  Here is the description of the Oracle Document:

  http://docs.Oracle.com/CD/E18283_01/server.112/e17110/waitevents003.htm#sthref3849

  During operations of Direct Reading of data asynchronously access path in the database files. At some point, the session must ensure that all the asynchronous i/o in circulation have been realized on the drive. This can also happen if during a direct reading without more slots is available for storing exceptional load requests (a charge application might consist of several e/s).

  
  

  Question:

  1 during operations of Direct data asynchronously reading path in database files.  > > this statement means what? What of "asynchronous reading '?

  2 describe above description for me in details.

  3. who can clearly explain "why read direct path wait to happen ' for me?

  
  

  Thanks in advance.

  Lonion
  

  
  

  Lonion wrote:

  Question:

  1. to path operations Direct playback of data asynchronously in the database files.  > This statement means what? What of "asynchronous reading '?

  2 describe above description for me in details.

  3. who can clearly explain "why read direct path wait to happen ' for me?

  If you want to get very technical, Frits Hoogland wrote a lot about the implementation:

  http://fritshoogland.WordPress.com/2013/05/09/direct-path-read-and-fast-full-index-scans/

  http://fritshoogland.WordPress.com/2013/01/04/Oracle-11-2-and-the-direct-path-read-event/

  http://fritshoogland.WordPress.com/2012/12/27/Oracle-11-2-0-1-and-the-KFK-async-disk-IO-wait-event/

  http://www.UKOUG.org/what-we-offer/library/about-Multiblock-reads/about-Multiblock-reads.PDF

  Concerning

  Jonathan Lewis

• Archiving log / nologging / direct path insert

  Could you please confirm if the following are true or correct me if my interpretation is wrong:
  
  Log mode archive 1) and logging is necessary to deal with the media recovery; It was not necessary for the recovery of the instance.
  
  (2) IF the insert is no. APPEND mode, redo is generated, even if the table is in nologging mode and database is in log noachive mode. This recovery is necessary for recovery of the instance.
  
  (3) direct path insert ignore cancel the generation and can jump redo generation if the object is in nologging mode.
  
  Thank you.
  
  In case if it is relevant, I'm using Oracle 11.2.0.3.

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  2 and 3) even if the table is in nologging mode, it generates little recovery data dictionary and index maintenance. After a reboot of a failure - Oracle reads the online redo logs and replay any what transaction it finds in there. It's the little "roll forward." The binary redo information are used to re-read everything that did not get written to the data files. This review included refreshing the information for CANCELLATION (UNDO is protected by roll forward).

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• direct path load question

  I do not understand why, in the course of a direct path load insert an exclusive lock on the table is required.
  
  Suppose I have a T table without any indexes or constraints, why can't update the table in a session and in bulk load in another session above the HWM?
  
  Thanks in advance

  Claire wrote:
  I do not understand why, in the course of a direct path load insert an exclusive lock on the table is required.

  Suppose I have a T table without any indexes or constraints, why can't update the table in a session and in bulk load in another session above the HWM?

  What would ensue if/when another session DML requiring HWM be triggered BEFORE the completed direct path loading?

• Insert / * + Append * / and direct-path INSERT

  Hi guys
  
  Insert / * + Append * / hint cause Oracle 10 G using direct-path INSERT?
  and so insert / * + Append * / suspicion causes an Oracle of using direct-path INSERT, insert / * + Append * / is subject to the same restrictions as direct-path, such as "the target table cannot have any triggers or referential integrity constraints defined on it.»
  
  
  
  Thank you

  How it would be difficult for you to look for the answer in the documentation and do not abuse this forum asking questions doc and flaming posters colleagues?

  ------------
  Sybrand Bakker
  Senior Oracle DBA

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