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The problem of managing the blocks of an external data fi le indexed by either a B-tree or an external hashing scheme is similar to that of managing memory for internal structures. When an external structure such as a data fi le needs more memory (for example, to insert a new record), it gets a new block from a free list that the system manages. That is, if the fi le contains n blocks, the system can allocate to it an ( n + 1) th block. When the fi le no longer needs a block, you can deallocate it and return it to the system. The complication in the management of external storage is that a block allocated to a fi le may have available space interspersed with data. For example, after you have removed a record from the middle of a data fi le, the block that contained that record will have space available for at least one record. Therefore, you must be able to keep track of blocks that have space available for one or more records as well as recognize when blocks are completely empty (so that you can return them to the system). Assuming the existence of allocate Block and return Block functions that get empty blocks from and return empty blocks to the system, write pseudo code implementations of the following external memory-management functions:
What data structure is appropriate to support these operations? You may assume that you can distinguish slots of a block that do not contain a record from those that do. You can make this distinction either by having a convention for null values within a record or by adding an empty/full flag.
What are some internal (e.g. organisational, individual, and management factors) and external factors (e.g. market, industry, social, economic, technological and political/policy factors) influencing the success or failure of organisations' attemp..
According to the Environmental Protection Agency, "rigid containers have definite retained shape and form and that are self-supporting" (EPA, n.d.) Some of the differences between rigid and non-rigid containers, according to this week's reading, "Rid..
Differentiate this type of discrimination from other types of discrimination. How is the liability involved different?
Discussion Question 2-1. What are the one or two most challenging issues in identifying and documenting IT acquisition requirements (i.e., the requirements for solving the problem that was defined)? Explain your reason(s) and how the issue(s) can be ..
Relevant information on the six potential locations of the warning siren towers and distance in miles to each of the seven schools is presented in the table below. Formulate the LP model for Union City to minimize towers built.
1. Show the calculate answer for the following problem. Show the answers for both arrays. Given the following array, INT[ ] myNumbers(7, 5)
Machine executed average of 5000 instructions per microseconds. How many instructions could be executed in a single time slice?
How information systems are linked to the business objectives of an organization.
How could the organization be roughly positioned in the future.
When looking at the chronology of the development of the Internet, which development do you believe to be the most important? Why?
Impose appropriate field types and lengths on all fields
How do the CNCI, the National Strategy to Secure Cyberspace, and Executive Order 13636 integrate? How are they interrelated, and how do they work together to create an overall strategy?
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