Oracle-L: Re: Wait for TC Enqueue.

From: Ken Heng <kheng_at_au1.ibm.com>
Date: Sun, 08 Dec 2002 18:58:37 -0800
Message-ID: <F001.00515015.20021208185837@fatcity.com>

Thanks Waleed. You are quite correct.

I am just surprise to see the TC enqueue wait lasting for 60seconds...

Rgds, ken.

                                                                                                                                       
                      wkhedr_at_attbi.com                                                                                                 
                      Sent by:                 To:       Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>                   
                      root_at_fatcity.com         cc:                                                                                     
                                               Subject:  Re: Wait for TC Enqueue.                                                      
                                                                                                                                       
                      06/12/2002 03:18                                                                                                 
                      pm                                                                                                               
                      Please respond to                                                                                                
                      ORACLE-L

I believe it has to with the fact that PQO uses direct reads bypassing the SGA
to read the object blocks and that requires to flush (checkpoint) all committed
changes in the SGA (dirty buffers) of that object to make sure the PQ slaves
will access the most recent version of that object.

Regards,

Waleed Khedr
> Hi,
>
> I ask this on another forum....but unfortunately got no response....
>
> I am trying to find out what 'TC' enqueue are. And why a select would
would
> wait for TC enqueue. I beleieve they have something to do with PQO and
> checkpointing...but I could not find any more details.
>
> Any help appreciated.
>
> Thanks.
>
>
>
> --
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> --
> Author: Ken Heng
> INET: kheng_at_au1.ibm.com
>
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Author: Ken Heng
  INET: kheng_at_au1.ibm.com

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Received on Sun Dec 08 2002 - 20:58:37 CST