1. Handles disk file 0000: array of file-offsets 0001: 0002: 0003: 0: …
1000:
1001:
1002:
1003:
1004: h
1005: e
1006: y
1007: \n
array of file-offsets 0: 1: 2:
3: 1000 …
998:
999:
0004
ID 3 containing the string hey\n

2. Memory Manager insert & remove Memory commands Manager file array 0:
free block list ….
file
array 0: 1: 2: 3: …
998:
999:

3. Buffer Pool insert & remove Virtual Memory commands Manager file array
free block list ….
file
array 0: 1: 2: 3: …
998:
999:
Buf
Pool

4. insert Memory Manager Buffer Pool F I L E A r r a y insert command
direct file
operations
F I L E
file write
request A
r r a y

5. remove Memory Manager Buffer Pool F I L E A r r a y remove command
direct file
operations
F I L E A
r r a y

6. print Memory Manager Buffer Pool F I L E A r r a y print command
direct file
operations
F I L E
file read
request A
r r a y