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For the personnel trees in Fig 9-17 the les will contain segments with pointers as shown in Fig 9-18 given that employees(1,1),(1,k),(2,j), all have job descr(i) Files with many logical linkages will hence be in practice much larger than they appear to one user The requirements for linkages are speci ed in the DL/1 internal schema through segment entries for logical members (LCHILD) and segment options for siblings (LTWIN), owners (LPARNT), and catenations of two segments only (PAIRED) for associative relations It is also possible to specify prior linkages allowing, for instance, owners to be found from members segments It should be noted that these linkages allow the reversal of hierarchical relationships in di erent internal schemas for the same database This is a facility not commonly available in database systems The le structures used by IMS are not identical to the standard methods provided by IBM for the 360 systems, since these were insu cient This is only one of many instances where inadequate le facilities have added considerably to the cost, complexity, and inadequate structuring of database systems Figure 9-19 sketches the four approaches used by IMS The storage linkages shown in the sketches are supplementary to the linkages used for the data models The basic unit to be stored, a DL/1 record, is a tree instance with one root segment and all its nested segments in preorder sequence Such a tree instance can be very large and may span many blocks Segments are not spanned The entire tree instance does not have to be read into core storage at one time but is accessed segment by segment, as was shown above Since access is based on the key of the root it is often wise to shorten the hierarchy by decaptation This creates more and smaller trees In the database laid out in Example 9-27 we may move the department level to a referenced relation, and use employee as the root.

The only way for an or expression to evaluate to false is if both variables are false. Of course, if both variables are true, the expression still evaluates to true. The not operator is slightly different; it operates on only a single variable, and evaluates to the opposite of the value of the variable:

The sequential le organization is available in IMS to allow tape or disk storage for les where mainly sequential access is expected The fetch of a tree instance based on an arbitrary search key will be very time-consuming The only

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You may have noticed that the and and or operators use doubled symbols (&& and ||) instead of single ones (& and |). The single symbols are for logical or bitwise operations, which you don t need to bother with in this chapter.

Figure 9-19

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Let s make things a bit more complicated. Often you will want to test whether two conditions are true, whether only one is true, or whether neither is true. An individual expression is enclosed in parentheses, and that expression is evaluated before anything else. Table 4-2 shows some more examples. The examples in this table assume two variables, x and y, in which x has the value 5 and y has the value 7.

dynamic updating possible is the addition of trees to the end All other updating is to be performed by batch programs which copy the le The indexed-sequential ISAM or VSAM have been extended with an over ow le to permit the management of the large and variable-length tree instances The HISAM method is suitable when sequential access, indexed access, and some updating are required The initial loading is done by a batch process, using an input le which contains the segments in the desired preorder sequence Only the initial block of a tree instance is kept on the indexed-sequential le Successor blocks for a big tree are placed on an over ow le This over ow le is a disk-resident sequential le, augmented so that blocks can be appended, marked deleted, or replaced In IMS VS another VSAM le without an index is used for this purpose

&& || !

Sec 9-6

(x == 3) && (y == 7) (x == 3) || (y == 7) !(x == 3)

In IMS/360 the insertion of a new tree instance is accommodated by use of an IMS-provided link chain to the over ow le, ignoring the ISAM over ow mechanism Insertion of new segments is accomplished by placing the segment in its proper physical position and moving the successor segments of this tree instance out of the way Over ow blocks will be acquired at the end of the over ow le, to accommodate any nal segments of a tree that do not t within the old blocks The direct-access organization has also been extended with an over ow le The HDAM method is useful if sequentiality is not required and updates are frequent Collisions are resolved by chaining in key sequence within a bucket Only the key of a root segment and a pointer to the remainder of the tree instance is stored in the direct-access le; the remainder of the root segment and all other segments of the tree are kept on the over ow le The direct le and the over ow le are actually separate areas of the same operating system le New segments are placed in any free area of the over ow le The segments of a tree instance are related to each other using pointers and will not be physically moved during updating Segments belonging to di erent tree instances may share blocks Two linkage choices for segments of a tree are available:

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