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9 Ιαν 2024 · Delve into the tangible aspects of data modeling with the creation of a physical data model. This step involves translating the logical model into a structure that aligns with the chosen...
On a 64-bit system, sizeof(unsigned long) depends on the data model implemented by the system, for example, it is 4 bytes on LLP64 (Windows), 8 bytes on LP64 (Linux, etc.). What's sizeof(size_t) supposed to be? Does it vary with data model like sizeof(long) does? If so, how? References: 64-bit data models on Wikipedia. c. 64-bit. sizeof. size-t.
16 Ιουλ 2024 · Data modellers collaborate with stakeholders at each stage of the process to define entities and attributes, establish relationships between data objects, and create models that accurately represent the data in a format that can be consumed by applications.
25 Ιουλ 2010 · A 64-bit machine should be able to address up to 2 64 addressable units (in architectures designed over the last few decades, addressable units are invariably bytes, a.k.a. octets). If you define a "gigabyte" as 2 30 addressable units, then yes, 2 34 gigabytes would be another way to express the same count.
16 Ιουλ 2011 · In a book I read the following: 32-bit processors have 2^32 possible addresses, while current 64-bit processors have a 48-bit address space. My expectation was that if it's a 64-bit processor, the address space should also be 2^64.
The article talks about how the processor can reference (or address) the memory. In all modern architectures memory is byte-addressable, which means that every byte-sized memory cell has a number (its address), which the CPU uses to identify that cell.
Help you learn about: The memory / storage hierarchy. Locality and caching. Virtual memory. How the hardware and OS give application programs the illusion of a large, contiguous, private address space. Virtual memory is one of the most important concepts in system programming.
