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CMSC424: Database Design Instructor: Amol Deshpande amol@cs.umd.edu
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An object that exists and is distinguishable from other objects. Examples: Bob Smith, BofA, CMSC424. Form entity sets with other entities of the same type ...
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database design. Entity-Relationship Model. Two key concepts. Entities: ... emp-city. manager. worker. Next: Weak Entity Sets ... Design Issue #2: Entity Sets ...
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CMSC424: Review Database Management Systems Manage data Store data Update data Answer questions about the data What kind of data ? Enterprise data Banking ...
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database design. Entity-Relationship Model. Two key concepts. Entities: ... cust-city. phone no. age. date-of-birth. Relationship Set Keys ...
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CMSC424: Database Design
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Star Wars. Faye. King Kong. Watts. King Kong. starName. movieTitle. Issues: ... Star wars. movieYear. movieTitle. Smaller schemas always good ???? Desiredata. No sets ...
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To express SQL, must extend RA to a bag algebra. Bags (aka: multisets) like sets, but can have duplicates ... Used to name query results ( ) e.g: SELECT ...
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We will also discuss some interesting open problems/research directions ... like searching for a single sentence in the contents of the British Library' ...
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Indiana Jones. Harrison Ford. 19xx. Witness. Harrison Ford. 198x. Indiana Jones. Harrison Ford. 1977. Star wars. Harrison Ford. 1977. Star wars. StarName. MovieYear ...
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Many raid 'levels' Different reliability and performance properties. RAID Levels (b) Make a copy of the disks. If one disk goes down, we have a copy. ...
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You've just been hired by Bank of America as their DBA for their online banking web site. ... Express the number of entities to which another entity can be ...
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Flash memory - limited number of write/erase cycles; non ... Western Digital. 500GB. Weight (max. g): 600g. CMSC424, Spring 2006. 10. CMSC424, Spring 2006 ...
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Introduced by Ted Codd (late 60's early 70's) ... Williams. Adams. Johnson. Glenn. Brooks. Green. ccity. cstreet. cname. Customer. 9M. 2.1M. 1.7M ...
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from movieExec me, movies m. where me.cert# = m. ... Boston. Downtown. assets. bcity. bname. assets. bcity. bname. Counter-intuitive: select * from movies ...
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Provide a mechanism to hide certain data from the view of certain users. ... Create a view of all loan data in loan relation, hiding the amount attribute ...
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R and R. The functional dependency ... the difference between r and R above ? CMSC424, Spring ... E.g. If A B and B C, then we can infer that A C. F (closure of F) ...
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Query: Find customers who have accounts in all branches in ... (deletes all Perry accounts) 2. Insertion: r r s. e.g., branch branch {(Waltham, Boston, 7M) ...
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Example Schedule (Schedule A) + Precedence Graph T1 T2 T3 T4 T5 read(X) read(Y) read(Z) read(V) read(W) read(W) read(Y) write(Y) write(Z) read(U ...
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Easy to make things complicated, very hard to keep them simple ... form of storage comes along with different properties (say holographic storage ? ...
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Consistency: Transaction, executed completely, takes database from one ... As much concurrency as possible, while not compromising isolation and/or consistency ...
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Release exclusive locks only at the very end, just before commit or abort ... The serializability order === the commit order. More intuitive behavior for the users ...
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... simple database, just giving names and incoming telephone number, but it helps ... Superkey: set of attributes whose values uniquely identify the entity ...
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You've just been hired by Bank of America as their DBA for their online banking web site. ... Both, but more of a noun to a bank. ( hence (a) probably more ...
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Easy to make things complicated, very hard to keep them simple ... How/where to store data, how to access it. Need to be cognizant of the memory hierarchy ...
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