Re: insert nologging parallel/noparallel and archiving

From: <Rick_Cale_at_teamhealth.com>
Date: Wed, 14 Aug 2002 06:33:39 -0800
Message-ID: <F001.004B45F3.20020814063339@fatcity.com>

As long as you are doing INSERT INTO ... using CTAS it can make use of NOLOGGING according to Oracle. I do not know why the single table does not use it. Perhaps posting relevant portion of insert stmt may provide some help

                                                                                                    
                                                                   The following operations can     
                                                                   make use of NOLOGGING mode:      
                                                                                                    
                                                                     -  direct load SQL*Loader      
                                                                     -  direct-load INSERT          
                                                                     -  CREATE TABLE ... AS SELECT  
                                                                   (CTAS)                           
                                                                     -  CREATE INDEX                
                                                                     -  ALTER TABLE ... MOVE        
                                                                   PARTITION                        
                                                                     -  ALTER TABLE ... SPLIT       
                                                                   PARTITION                        
                                                                     -  ALTER INDEX ... SPLIT       
                                                                   PARTITION                        
                                                                     -  ALTER INDEX ... REBUILD     
                                                                     -  ALTER INDEX ... REBUILD     
                                                                   PARTITION                        
                                                                     -  INSERT, UPDATE, and DELETE  
                                                                   on non-internal LOBs in NOCACHE  
                                                                   NOLOGGING                        
                                                                                                    
                                                                                                    
                                                                                                    





                                                                                                                   
                    Gurelei                                                                                        
                    <gurelei_at_yahoo       To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>       
                    .com>                cc:                                                                       
                    Sent by:             Subject:     Re: insert nologging parallel/noparallel and archiving       
                    root_at_fatcity.c                                                                                 
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                    08/14/2002                                                                                     
                    10:03 AM                                                                                       
                    Please respond                                                                                 
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Jack,

I have another twist on this situation. Again I'm loading the tables in nologging mode with all the indices dropped. Both transactions are insert into table nologging (select *). The only difference is that one select is a select from a single table while the other - is a select from two joined tables.

The first insert (from a single) table produce archives, while the other (from two tables) - doesn't.

Is there en explanation for that?

thanks

Gene

• Jack Silvey <jack_silvey_at_yahoo.com> wrote:
  > sorry, meant insert as select, not insert as append
  > --- Jack Silvey <jack_silvey_at_yahoo.com> wrote:
  > > Gene,
  > >
  > > This sounds right.
  > >
  > > Standard insert as append does freelist block
  > > checking
  > > and generates redo. Parallel DML generates
  > minimial
  > > redo, just for the new temp segments being
  > created,
  > > not for the datablock updates. This is one reason
  > it
  > > is so fast.
  > >
  > > Index changes are always logged, even in PDML and
  > > append modes.
  > >
  

  ---

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Received on Wed Aug 14 2002 - 09:33:39 CDT