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RAC issue [message #531825] Thu, 17 November 2011 19:51 Go to next message
andy huang
Messages: 498
Registered: July 2011
Senior Member
Dear all,
If two nodes access the same data block at the same time, how RAC to deal with it?
Re: RAC issue [message #531826 is a reply to message #531825] Thu, 17 November 2011 19:57 Go to previous messageGo to next message
BlackSwan
Messages: 26757
Registered: January 2009
Location: SoCal
Senior Member
>If two nodes access the same data block at the same time, how RAC to deal with it?
RAC handles it well.
Re: RAC issue [message #531829 is a reply to message #531826] Thu, 17 November 2011 22:12 Go to previous messageGo to next message
andy huang
Messages: 498
Registered: July 2011
Senior Member
Thanks,
BlackSwan,but i want to know how oracle to deal with it.
Re: RAC issue [message #531856 is a reply to message #531825] Fri, 18 November 2011 01:47 Go to previous messageGo to next message
Michel Cadot
Messages: 67649
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
It is quite complex, it depends on access mode each node requests the block (read or write, consistent or current).
In short, each block is associated to a master node, each requester node asks the master node in which state is the block and which node held it and depending on the case, the block is read from the datafile or gotten from the interconnect link (global cache).

Regards
Michel

[Updated on: Fri, 18 November 2011 03:59]

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Re: RAC issue [message #531870 is a reply to message #531856] Fri, 18 November 2011 03:09 Go to previous message
andy huang
Messages: 498
Registered: July 2011
Senior Member
Thanks Michel!
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