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The records may still be located directly for the primary attribute and indirection employed for secondary keys However, for symmetry, the system sketched in Fig 4-31 uses indirect referencing throughout Not all attributes need to have address spaces of equal length The goal le itself may have a pile or a sequential organization An insertion into a le using multiple pointer-lists will require changes to all pointer-lists in addition to the operation on the main le All entries for the same transformed value will have the same pointer-list address This increases the collision rate for attributes which are not unique When we dealt with simple direct les, whose records are stored by key values, we expected uniqueness Many other attributes in records will not have unique values The example of Fig 4-31 is hence atypical; you may wish to consider the pointer-list for sex = "male" Identical data attributes must lead to identical addresses in the the pointer-list space This problem can also be dealt with through the collisionhandling mechanism, but obviously attributes with poor partitioning power can overwhelm the mechanics of many solutions The result of the key-to-address transformation can no longer be uniform The use of over ow buckets rather than open addressing is now called for A popular database management system, adabas, uses the types of access presented here The pointer-lists may be prede ned and maintained, or created dynamically in response to transaction requests It also is possible to share a single pointer address space for several attributes by making this space appropriately larger and including the name, or another suitable identi er of the attribute itself, in the input to the address transformation function Figure 4-32 sketches this design using the symbols (I1 , I2 , I3 ) for attribute-type identi cation This method becomes especially interesting if the records have an irregular number of attributes, so that the individual pointer address spaces are of di erent sizes and possibly have dynamically varying length requirements The fact that no individual pointer-list areas have to be dimensioned and allocated reduces the amount of unused space while keeping the probability of exceeding the pointer space low A larger shared space can also reduce collisions due to clustering To verify that in case of a collision the correct pointer is picked, it is necessary that the pointer entry can be matched to its attribute name If this check is not made, problems will arise if two key values of di erent attributes are both identical and produce the same result from the address transformation An example would be a case where the health record number for John and the employee number assigned to Peter are identical and both happen to transform to the same address by di erent algorithms The author has come across a system where this case was not considered, but no access failure had ever been reported Transformations could be designed to avoid this possibility, but this restricts the choices available and limits the adaptability of this approach.

4

Shared Pointer-List A Common Transformation Procedure for Multiple Attributes A le using many attributes for access may need as many independent transformation routines The de nition and use of distinct routines can be avoided by transforming both the attribute name and value into an address within a single shared pointer-list The

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After the assignment, p points to the start of 1,000 bytes of free memory In the preceding example, notice that no type cast is used to assign the return value of malloc( ) to p In C, a void * pointer is automatically converted to the type of the pointer on the left side of an assignment However, it is important to understand that this automatic conversion does not occur in C++ In C++, an explicit type cast is needed when a void * pointer is assigned to another type of pointer Thus, in C++, the preceding assignment must be written like this:

Sec 4-6

sketch in Fig 4-33 explains the catenation of the name and value strings prior to hashing A disadvantage of the simple scheme is that the pointer entry has to carry a long identi er for veri cation purposes The attribute name is better carried in abbreviated form The abbreviation might be a sequence number I, I = 1 a in a dictionary or schema for possible attributes, and this solution is illustrated The abbreviation has only to add enough information to the hashing algorithm to compensate for the increase in address space size The combined input to the hashing algorithm has to be kept as a key to test for collisions Another solution to the collision problem is to defer the recognition of collisions to the goal records The exact implementation will vary depending on the form of the goal records

EXAMPLE (Oracle)

5:

a major reorganization of the le structure and modi cation of the associated programs may be required

To avoid the cost of a major change a programmer may decide to put additional data elements into positions originally intended for other purposes This situation is analogous to the making of machine-language changes in the output of compilers Such situations are no longer acceptable in programming because of the low cost of recompilation; in the area of le management, the patching of le structures is still common An example of such a patch is given in Example 1-4 Example 1-4

List the offer number, course number, and name of the instructor of IS course offerings scheduled in fall 2 0 0 5 taught by assistant professors SELECT OfferNo, CourseNo, FacFirstName, FacLastName FROM Offering, Faculty WHERE OffTerm = 'FALL' AND OffYear = 2005 AND FacRank = ASST' AND CourseNo LIKE 'IS%' AND FacultyFacSSN = OfferingFacSSN

p = (char *) malloc(1000);

Given that the records of a personnel le have elds as follows:

name,address,sex,salary,military service,date employed;

As a general rule, in C++ you must use a type cast when assigning (or otherwise converting) one type of pointer to another This is one of the few fundamental differences between C and C++ The next example allocates space for 50 integers Notice the use of sizeof to ensure portability

In the SQL:2003 standard, the join operation can be expressed directly in the FROM clause rather than being expressed in both the FROM and WHERE clauses as shown in Examples 48 and 49 Note that Oracle beginning with version 9i supports join opera tions in the FROM clause, but previous versions do not support join operations in the FROM clause To make a join operation in the FROM clause, use the keywords INNER JOIN as shown in Example 410 The join conditions are indicated by the ON keyword in side the FROM clause Notice that the join condition no longer appears in the WHERE clause

and a eld for maternity leave is required The records are used by many programs, even though only a few of them use the military service eld The patch adopted is to use this eld for maternity leave whenever the sex eld indicates a female employee

IF sex= F THEN maternity leave = military service;

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