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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 7 - Cache Fusion and Inter Instance Coordination

Lock Modes

Now that we've looked at resource roles, resource modes, and past images, let's consider the possible resource access modes (as shown in Table 7.2).

There are 3 characters that distinguish lock or block access modes. The first letter represents the lock mode, the second character represents the lock role, and the third character (a number) indicates any past images for the lock in the local instance.

Lock Mode

Description

NL0

Null Local and No past Images

SL0

Shared Local with no past image

XL0

Exclusive Local with no past image

NG0

Null Global - Instance owns current block image

SG0

Global Shared Lock - Instance owns current image

XG0

Global Exclusive Lock - Instance own current image

NG1

Global Null - Instance Owns the Past Image Block.

SG1

Shared Global - Instance owns past Image

XG1

Global Exclusive Lock - Instance owns Past Image.


Table 7.2 Lock Modes

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
 ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma

 

   
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