What is the purpose behind the Three Phase Commit? It improves upon the two phased commit by requiring that locks be acquired at the start of a transaction. It allows for coordination even in the event of unreliable network connections. It ensures that no shared locks are help by other connections in the event of a write operation. None of the above.

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

explanation: