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Manipulation of Rings As shown in the examples above, the typical multiring le organization avoids redundancy of data by placing data common to all members of a ring into the header record of the ring For example, the name and other data about the department of an employee appears only in the header record A negative e ect is that, in the basic ring design, whenever a record is to be fetched based on a combination of search arguments, the match of all search arguments with data values applicable to the record cannot always be performed using only the attributes kept in the member or the header records accessed during the search along one path Two alternatives can be used: 1 A parallel search through all rings identi ed in the search argument can be made, terminating at the records at the intersection of these rings 2 An initial search can be made according to the attribute with the best selectivity The records collected are then checked for appropriateness by locating the header records for the other attribute types needed and rejecting records with inappropriate data values

Most professional C/C++ programmers would find the second version easier to read and understand In fact, the pointer version is the way routines of this sort are commonly written in C/C++

This latter process applied to the simple structure of Fig 3-26 yields the steps shown in Example 3-11

Example 3-11

Pointers may be arrayed like any other data type The declaration for an int pointer array of size 10 is

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Inexact matching supports conditions that match some pattern rather than matching an identical string One of the most common types of inexact matching is to find values hav ing a common prefix such as "IS4" (400 level IS Courses) Example 44 uses the LIKE op erator along with a pattern-matching character * to perform prefix matching The string constant 'IS4*' means match strings beginning with "IS4" and ending with anything The wildcard character * matches any string The Oracle formulation of Example 44 uses the percent symbol %, the SQL:2003 standard for the wildcard character Note that string constants must be enclosed in quotation marks

Query: Find an Employee with Location ="Thule" and Profession="Welder" Enter Location chain; For each member record determine if key = Thule; When found follow Employee chain; For every Employee record the profession must be determined Follow the profession chain; When its header record is reached, then inspect profession header for key = Welder If the eld matches the search key then Employee member record becomes output; Continue with the next Employee record; When its header record, the Location = Thule is reached, then the result is complete The importance of the nal pointer to the header which transforms a chain into a ring is clear here, but the cost of obtaining data from the header can still be great Hence it may be desirable to still keep important descriptive data redundantly in the record, or to expand the structure to allow easy access to header records Auxiliary constructs for that purpose are presented in Chap 4-7 Selecting the attributes for which rings should be established uses similar critera used for the decisions to determine the attributes to be indexed in an indexed le The cost of following the chains increases linearly with chain sizes The sizes of individual chains can be reduced by increasing the number of chains and the number of levels in the structure of the le Increasing the number of levels (x) reduces the expected chain lengths (y), since the number of partitions for the lowest-level (1) records increases If all chain lengths in the le are equal, the expected chain length according to one hierarchy, say locations, departments, employees in Fig 3-30, is

equal chain lengths 3-91

int *x[10];

E X A M P L E 44 (Access)

since the product of all the chains (#locations * #departments per location * #employees per department) is y 3 = n This e ect is shown graphically in Fig 335 Equation 3-91 is equivalent to stating that x = logy n, similar to the number of levels found for indexes (ie, Eq 3-48) However, in this le organization the partitioning of the le by attributes and hence the number of levels determines the chain sizes; whereas the computed fanout determines the number of levels in an index We consider now the case where the desired record can be recognized without having to trace back to alternate headers The search time for a lowest-level record decreases then proportionally to the xth root of the record count, n, and increases proportionally to the number of levels, x

Sec 3-6

To assign the address of an integer variable called var to the third element of the pointer array, write

SELECT* FROM Course WHERE CourseNo LIKE 'IS4*'

Example 3-12

.

x[2] = &var;

CourseNo IS460 IS470 IS480 CrsDesc SYSTEMS ANALYSIS B U S I N E S S DATA COMMUNICATIONS FUNDAMENTALS OF DATABASE MANAGEMENT CrsUnits 4 4 4

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