Issues in the control of resources

DB version: 10 gr 2, 11 2 GR

The resource in 'Resouce Mastering' term actually only a block. No lines, table... etc. Right?

Under what circumstances is the master of a resource (instance a) changed to another?

I read the following in a book called 'Pro Oracle Database 11g RAC on Linux'

Block Fusion cache transfers rely on the global resources directory, and they require ever more
only three jumps, depending on the configuration and the number of nodes. Of course, if there's only two
cluster nodes, then there will be a two-way transfer of cache. For more than two nodes, a maximum of
three jumps will be necessary.

What is the jump that they speak?

Added a third question
Edited by: T.Boyd may 4, 2011 12:02

Hello

Yes, it refers to a block. Although the entity may be different - sometimes all the blocks of an object (table) can be remastered. This will affect then all rows in the table. But remastering reach the level of the blocks.

If you put it in simple terms: "in general when an object is frequently consulted form a node only."
However this is not as easily reproduced. Also, the mechanism internal to detect who is much more complicated.

The jump is a very weak message.

Simpler described that way (this only occurs when several instance wants to write/release to date. In the case of the readings it is much simpler):

You have 3 partners in a RAC. An instance (A) has the block in the cache, one instance (B) please block for writing, and one instance (C) is the master for the block.
Master means, this instance knows which instance the block at the moment.
What is generally known in the cluster is, which is the master of each block. (Which is held in the SCM).

So what happens now that B sends a message to C who owns the block.
Informed C then has to ship the b block.
The block is shipped, and B tells C that now he (B) is the holder of the block.

If you have 3 informational messages and a block of shipping, which is the maximum.
If the holder/applicant and master are on the same node, you have no messages (so 0 hops).

Concerning
Sebastian

Tags: Database

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