Answer Posted / charan
Journal is prevents from image failure.
these are 3 types
they are
1.Recovery journal 2. Transient Journal 3.permanent Journal
Images are defined into 4 types based on Journals
they are,
1.single image 2.Dual image 3.Before Image 4.After Image
Single image: It Takes the one copy of the data
Dual Image : It Takes 2 copies of data
Before Image: It takes copy of the data before operation
After Image : it takes copy of the data after operation
Recovery Journal:
It will useful for Recovery the data.Suppose if there is any fail will happen in AMP
Transient Journal:
It will useful for the data if there is any operation fails means go to the previous step.
Permanent journal:
It will takes the data for Partial and full recovery
for,
Partial Recovery:
B.I+(Mon to Sun) A.I
Full Recovery:
B.I.+(Mon to Wed) A.I.
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