Slideshow:
- There are 2 common techniques to
identify a
block/record stored on
disk:
- Physical datbase address
- Logical database address
- Physical Address
of a block:
- Physical Address of a
block =
physical address used to
identify a block
on a disk
- Components of a
physical block address:
A physical block address consists of:
- Host ID of the host (computer) that contains the disk
- Disk ID of the disk on the host
- Block number of the block on the disk
- Physical Address of a
block =
physical address used to
identify a block
on a disk
- Physical Address of a
record:
- Physical Address of a
record =
physical address used to
identify a record
on a disk
- Components of a
record physical address:
- Physical address of a block plus
- Offset of the record inside the block
- Physical Address of a
record =
physical address used to
identify a record
on a disk