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Asp Interview Questions and Answers Part 4

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Oracle Interview Questions&Answers Part 5

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What is SGA? The System Global Area in an Oracle database is the area in memory to facilitate the transfer of information between users. It holds the most recently requested structural information between users. It holds the most recently requested structural information about the database. The structure is database buffers, dictionary cache, redo log buffer and shared pool area. What is a shared pool? The data dictionary cache is stored in an area in SGA called the shared pool. This will allow sharing of parsed SQL statements among concurrent users. What is mean by Program Global Area (PGA)? It is area in memory that is used by a single Oracle user process. What is a data segment? Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored. What are the factors causing the reparsing of SQL statements in SGA? Due to insufficient shared pool size. Monitor the ratio of the reloads takes place while executing SQL statem...
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The Least k Numbers - Interview Question&Answer

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Question:  Please find out the least  k  numbers out of  n  numbers. For example, if given the 8 numbers 4, 5, 1, 6, 2, 7, 3 and 8, please return the least 4 numbers 1, 2, 3 and 4. Analysis:  The naïve solution is sort the  n  input numbers increasingly, and the least  k  numbers should be the first  k  numbers. Since it needs to sort, its time complexity is  O(n log n) . Interviewers will ask us explore more efficient solutions. Solution 1: O( n log k ) time efficiency, be suitable for data with huge size A data container with capacity  k  is firstly created to store the least  k  numbers, and then a number is read out of the  n  input numbers at each time.   If the container has less than  k  numbers, the number read at current round (denoted as  num ) is inserted into container directly. If it contains  k numbers already,  num  canno...
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