TAILIEUCHUNG - HandBooks Professional Java-C-Scrip-SQL part 156

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 156', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1. In order to reduce the size of the free space list entries I ve also reduced the number of objects in the main object list to 256 so that an object number will fit in one byte. 2. Another possible optimization would be of use when we are loading a large number of items into a quantum file in that case we could just start a new quantum whenever we run out of space in the last added to quantum. This would eliminate the search of the free space list entirely and might be quite effective in decreasing the time needed to do such a mass load. Of course this solution would require some way for the class user to inform the quantum file system that a mass load is in progress as well as when it is over so that the default behavior could be reestablished. 3. And they may even work properly after you compile them. Unfortunately I discovered shortly before sending this book to the publisher that the mailing list program in Chapter doesn t work when compiled under DJGPP although it runs perfectly when compiled under VC . Apparently the similarity among compilers isn t quite as great as I thought it was. Heavenly Hash A Dynamic Hashing Algorithm Introduction It s time to revisit the topic of hash coding or hashing for short which we previously discussed in Chapter . Algorithm Discussed Dynamic Hashing Problems with Standard Hashing Hashing is a way to store and retrieve large numbers of records rapidly by calculating an address close to the one where the record is actually stored. However traditional disk-based methods of hashing have several deficiencies 1. Variable-length records cannot be stored in the hash table. 2. Deleting records and reusing the space is difficult. 3. The time needed to store and retrieve a record in a file increases greatly as the file fills up due to overflows between previously separated areas of the file. 4. Most serious of all the maximum capacity of the file cannot be changed after its creation. The first of these .

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