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An allocator manages memory allocation for a container Since the STL defines a default allocator that is automatically used by the containers, most programmers will never need to know the details about allocators or create their own However, these details are useful if you are creating your own library classes, etc All allocators must satisfy several requirements First, they must define the following types: const_pointer const_reference difference_type pointer reference size_type value_type A const pointer to an object of type value_type A const reference to an object of type value_type Can represent the difference between two addresses A pointer to an object of type value_type A reference to an object of type value_type Capable of holding the size of the largest possible object that can be allocated The type of object being allocated

If a rewrite is not accomplished in time, a second revolution is lost, so that TRW = 4r When there is a uctuation of the computational time, sometimes one, at other times two or more, revolutions will be lost The use of the average value of c in the analysis will give erroneous results, since the relationship between c and TRW is not linear 10 will present methods to evaluate such cases If there is other use of the disk unit, a new search is required when the computation is completed and TRW = c + TF if c 2r 2-32

FUNDAMENTALS O F B U S I N E S S S Y S T E M S ANALYSIS B U S I N E S S DATA COMMUNICATIONS FUNDAMENTALS O F DATABASE

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We have, in the preceding sections, taken a variety of hardware types and a number of basic, low-level, le-software implementation choices and distilled their e ect into a small number of parameters: seek time s, rotational latency r, and transfer rates t and t We use these parameters in Chaps 3 and 4 to produce measures of le-system performance In Chap 5 we relate the results to overall system performance with respect to the laod that applications place on a database system In Sec 4-4 we consider the e ect of parallel operations of multiple disks and computers In such architectures, due to overlap, the times required for complex operations can be less than estimates based in simply adding the times computed using the parameters We summarize the parameters now in the context for which they were derived, namely, the evaluation of the performance of les and databases which use the prevalent disk devices We will then discuss the applicability of these parameters for alternate storage devices

Second, they must provide the following functions address allocate deallocate max_size construct destroy Returns a pointer given a reference Allocates memory Frees memory

Unit ms ms char/ms char/ms char Code Function Mechanical delay Rotational delay Block transfer Sequential transfer Fixed transfer unit Records per block Condition Device requires positioning Block access or 1/2 reaccess Hardware speed Requires bu ering Hardware or system speci ed Blocking method and t

4 4 4 4

Estimation of the bulk transfer rate t requires determination of the waste W due to blocking and gaps G, and consideration of a minimal seek s1 or a latency loss 2r whenever a cylinder break occurs Bulk transfer implies continuous operation which requires bu ering and assuring that c Bfr < btt These, and other assumptions made, require periodic veri cation during the design of a database system and the evaluation of its performance The sections where the parameters are derived may have to be reread to assure that the formulas remain applicable in speci c situations We do not include a table of formulas here, since that could encourage their erroneous application The index of the book can be used to locate the page where the derivation of the parameter begins From these primary parameters we derive some useful secondary parameters The time to transfer a block having B characters, after positioning and latency delays, is btt = B/t ms The random-access time to a block is then s + r + btt, but a block being read sequentially is transferred in a time B/t ms A shorthand notation for the time to reaccess a block, typically done in order to rewrite it with changed data, is TRW = 2r It is clear that this simple parameterization leaves some holes uncovered in the system-design process In the remainder of this chapter we will raise some warning signs, so that we can avoid distracting the reader from the principal subjects in the chapters ahead Whenever the simple hardware model used previously does not hold, a system-design process has to reevaluate the results obtained in this and the following chapters The general methodology employed, however, should remain valid

Returns the maximum number of objects that can be allocated Constructs an object Destroys an object

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