It is LRU or FIFO

[mahajanakhil198]

Because:
The checkpoint queue is a linked list of all dirty buffers, ordered by when they were first modified; therefore a dirty buffer is only listed once in the checkpoint queue. The first entry in the checkpoint queue is always the buffer that has been dirty for the longest time.

In this way, the buffer that get dirtied first will be the first one that will be aged out. N if this buffer is again modified, then irrespective of this fact, this buffer's position is not changed on checkpointing queue as a dirty buffer is listed only once in the checkpointing queue.

This is wat Oracle's book content suggests to me..What do u think? How do u perceive it?