Buffer Pool Functions
Buffer manager interface:
Buffer ReadBuffer(Relation r, BlockNumber n)
- ensures page n of file for relation
r is loaded
- increments reference (pin) count and usage count for buffer
- returns index of loaded page in buffer pool (
Buffer value)
BufferDesc *BufferAlloc(
Relation r, ForkNumber f,
BlockNumber n, bool *found)
- used by
ReadBuffer to find a buffer for (r,f,n)
- if no available buffers, select buffer to be replaced
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