By Niklaus Wirth

One of many vintage texts on information buildings and algorithms! Examples are in Pascal.

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Extra info for Algorithms + Data Structures = Programs

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The buffer manager communicates with a storage manager to get data from disk. The storage manager might involve operating- tern commands, bul more typically, the DBMS issues commands directly to the disk controller. Transaction Processing Queries and other DML actions are grouped into transactions, which are units thai must be executed atomically and in isolation from one another. Any query or modification action can be a transaction by itself. In addition, the execution of transactions must be durable^ meaning that the effect of any compk transaction must be preserved even if the system fails in some way right after completion of the transaction.

2,3. Notice that when a tuple appears in isolation, th at 1 ril MI Irs do not appear, SO some indication of the relation to which the tuple belongs must be given. We shall always use the order in which the attributes were listed in the relation schema. id requires thai each component of each tuple be atomic; that is. it must be of some elementary type Mich as integer or string. It is not permitted for a value to he a record Structure, set, list, array, or any other type that reasonably can have its values broken into smaller components.

I he topic is movies, and it builds on the relation Movies that has appeared Ear in examples The database schema is shown in Fi^. 5. Hej re the thin we nerd to know to understand the intention of this schema. BASICS 01 llll in l \llo\M \K)Dl I. Movies I in-- relation is an extension of the example relation we 1 • • n disci Remember thai its key is t i t l e and year together. We have add two new attributes; studioName tells us the studio thai owns the movie, ai producerC# is an integer that represents the produce!

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