TAILIEUCHUNG - CMU - SCS 15-415/15-615 Database Applications

Because these subsystems are implemented in SAS TK, they can be installed inside the DBMSs offered by the major DBMS vendors. They are then available to perform some or all of the processing requested by the client. For example, when SAS procedures push down SQL, or when some other SAS process is requested from a client, the processing occurs inside the DBMS where the subsystems are deployed. Appropriate output is returned to the calling client, a SAS session, for example, thereby reducing data movement. In a previous example, we saw that PROC FREQ can push an SQL statement to. | CMU - SCS 15-415 15-615 Database Applications Spring 2013 C. Faloutsos Homework 3 Indexing Due 1 30pm on Thursday 2 21 2013 Reminders - IMPORTANT Like all homework it has to be done individually. As elaborated in section 4 please submit your answers - in hard copy in class 1 30pm on Thursday 02 21 2013 and - e-copy of your code through blackboard under Assignments Homework 3. We will create a thread for this purpose. Please make sure your program compiles and works without any errors or warnings on the andrew machines as it will be tested there. Test your code for as many corner cases as you can imagine - we will grade it by running it on a set of secret test cases we have created like empty tree tree with a single entry etc etc . Reminders - FYI Weight 20 of homework grade. The points of this homework add up to 100. Homework prepared by Danai Koutra. Rough time estimates 20 hours 5 hours to download compile and understand the code 15 hours to implement and test the required functions . 1 Preliminaries - Our B Tree Implementation This assignment is designed to make you more familiar with the B Tree data structure. You are given a basic B Tree implementation and you are asked to extend it by implementing some new 1 operation functions that we list in subsection 2 The specifications of the basic implementation are 1. It creates an inverted index in alphabetical order in the form of a B tree over a given corpus of text documents explained in detail later . 2. It supports the following operations insert scan search and print. 3. No duplicate keys are allowed in the tree. FYI It uses a variation of Alternative 3 and stores a postings list for each word that appears many times. 4. It does not support deletions. 5. The tree is stored on disk. Where to Find Makefiles Code etc. The file is available at http christos courses hws HW3 or through AFS afs user christos www courses hws HW3 . Unzip the file. .

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