Cattell, R. G. G., Object Data Management , Addison-Wesley, Reading, MA, 1994.  Home/Search   Document Not in Database   Summary   Related Articles   Check

.... low level database definition and programming language; it would be difficult, for instance, to perform control engineering design using a conventional database programming language like SQL) Almost all of these extra features are included in object oriented database management systems [111, 18]. Object oriented databases are in fact gaining popularity in the comparatively new complex domains such as CASE, VLSI, CAD CAM and other branches of CAE. A survey of object oriented database management systems specifically designed for engineering applications is given in [2] The ....

R.G.G. Cattell. Object Data Management. Addison-Wesley, 1991.

....rather than bulk processing, is the more predominant use for this data. The relational database paradigm does not support complex traversals in a manner that is intuitive to use. STEP s data access needs are more compatible with the representational capabilities of object oriented database systems [129]. 6.8 SDAI AND ITS FAMILY OF STANDARDS SDAI really requires a combination of standards. The first in the series, ISO 10303 22 [130] is a functional specification; it is independent of a programming language. ISO 10303 23 [131] 24 [132] and 25 [133] bind SDAI to particular programming ....

Cattell, R. G. G. Object Data Management. Addison-Wesley Publishing Company, Inc. 1992.

....1 This research was partially supported by the Ministry of Trade, Industry, and Energy of KOREA under project 943 20 4, Implementation of Design Tools for Object Oriented Database . i 1 Introduction In object oriented databases(OODB) the unit of storing and retrieving information is an object[1]. The OODB thus is a collection of a number of objects. The object usually contains plenty of reference information; it represents inter relationship between objects, and plays an important role to express rich semantics. Due to the rich semantics, target applications of OODBMSs are CAD CAM, CASE, ....

R. G. G. Cattell, Object Data Management, p.94, Addison-Wesley, 1992

....program at the client is not aware of the difference. A very important difference between OEM and conventional OO models is that OEM is much simpler. OEM supports only object nesting and object identity; other features such as classes, methods, and inheritance are omitted. Incidentally, Cat91] claims that the only two essential features of an OO data model are nesting and object identity. Our primary reason for choosing a very simple model is to facilitate integration. As pointed out in [BLN86] simple data models have an advantage over complex models when used for integration, since ....

R. G. G. Cattell. Object Data Management. Addison-Wesley, 1991.

....in various domains. Clearly, there are not as many interpretive mechanisms as there are application domains. In the database area, for instance, the relational standard is fairly welldefined, thus yielding a single IMM, whereas the OO way leads to two different potential standards SQL3 and ODMG [Cattell 94] hence to two different IMMs. Metamodeling on the implementor s side appears as a way to integrate international standards in our software tool. 5. ....

Cattell R.G.G., Object Data Management, Addison-Wesley, 1994.

....this has to do, of course, with its absence from PIR3. Therefore, a specific solution must be found. But this problem is well known and well solved in the Database community, where translation from object based models to relational representations routinely flatten hierarchies [Bouzeghoub 1984; Cattell 1994] As a matter of fact, this is a standard application of MtaGen itself [Revault 1991; Revault 1996] 4. Conclusion Besides comparing meta modeling formalisms in order to sketch some equivalence between them, we propose here a practical way to combine the experience gained in 10 years of Model ....

R.G.G. Cattell. "Object Data Management". In Object-Oriented and Extended Relational Database Systems. Addison-Wesley Publishing Company. 1994

....the project plan in the shared workspace; this provides a data template at the start of the project. Workspaces are partitions of the design object space that allow designers working on the various parts of a project to selectively make their design objects visible to others in the project [12]. In the RASSP configuration management model, three types of workspaces exist: private, 12 shared, and global. Workspaces are organized hierarchically, as shown in Figure 8. Each node in the hierarchy represents a workspace. Branches in the hierarchy represent a parent child relationship ....

....the time from design to manufacturing setup can be consistently reduced by more than 10X over current methods. In 1995, the Navy Best Practice survey team identified the RASSP manufacturing interface as a best practice as a result of the dramatic productivity improvements demonstrated to date. [12] 4.5 Communications Services The ATL RASSP team formulated the communications services requirements by identifying specific capabilities the services would provide in support of the overall enterprise functions. The team plans to use public networks as the primary interconnection medium to ....

Cattell, R.G.G., "Object Data Management", Addison Wesley, MA, 1991.

....one advantage of the object oriented (OO) approach consists in its modularity. The OO approach originated in OO programming [5] and gained its first big success with the programming [6] of graphical interfaces. Later, it was generalized to many areas, such as distributed systems [11] and databases [4], software engineering [2] artificial 3 Driver Engine Wheel Door Outage Task Bus Truck Car On duty 0. 1 On leave 0. 1 Post vehicle drives Figure 2: Mail Delivery System (Object View) intelligence [10, 16] and information systems [15] The main benefits of an OO approach to a ....

R. Cattell. Object Data Management. Version 2, Addison-Wesley, 1994.

....is enabled for programs having write privileges on a class. To aid in persistence, each object contains a unique object identifier (oid) which is obtained when the object is created. References are to oid s which are swizzled to memory addresses when the referenced objects are loaded. Cattell [Cat94] has a good discussion of swizzling techniques. Non persistent objects are considered garbage. 12 4 Building Pinned View Systems Adaptively 4.1 Analysis and Design For a Pinned View System Analysis and design proceeds top down by describing and constraining the real world miniworld that will ....

....or all existing programs may need to be recompiled. However, no changes need be made to the older propagation patterns and view class dictionaries. 5 Comparison To Related Work 5. 1 Succinct Subpath Methods Object Query Language(OQL) has been developed by the Object Data Management Group(ODMG) [Cat94] as an SQL like query language for object oriented databases. Coleman Harrison [Har94] has developed an extension to OQL called Adaptive Query Language (AQL) which uses the Demeter concepts of traversal to help express the query. Wheras OQL requires that the path between two objects involved in a ....

R.G.G. Cattell. Object Data Management. Addison Wesley, Reading, MA, 1994. Revised Edition.

....to determine which data objects fall within the specified index range, and responds with a list of qualifying object IDs. We assume that an object ID is in the common structured form, i.e. it contains a physical page number in its higher order bits and a logical slot number in the low order bits [1], so that the page in which an object resides is indicated by its ID. The client processes the received list of objects IDs sequentially, requesting the server for the data page of an object missing from its local cache as necessary. Similarly, any index entry delete and insert requests resulting ....

R.G.G. Cattell, Object Data Management, Addison Wesley, Reading, MA, 1991.

....All the benefits of this model can be achieved by using a persistent store for storing the objects. The objects and their associations will remain the same from one invocation of the server to another which provides us with a solid basis for the framework. Object database management systems (Cattell, 1994) can provide many different features we find useful. In addition to persistency a concept of versioning is necessary. An electronic newspaper can be taken as a collection of the latest versions of the objects in the logical model. Every time a new version of an existing object is introduced into ....

Cattell, R.G.G. (1994). Object Data Management, Addison-Wesley.

....active research problems. Primarily, extensible database systems have been used as back end systems or as testbeds to experiment with novel picture data models, picture query processing algorithms, and new system architectures for PDBMS. Many of the systems that employ object oriented databases [103, 16, 25, 169] for picture retrieval may be loosely placed under this category [167, 79, 88, 105] Next we discuss adaptive picture retrieval systems in the following section. 2.4 Adaptive Picture Retrieval Systems A distinctive characteristic of systems is this category is that they recognize the fact that ....

R. Cattell. Object Data Management. Addison-Wesley, Reading, 1994.

....objects in WWW include references (URLs) to other objects. To implement object stacking and server stacking, these references should be rewritten consistently. I call this rewriting pointer swizzling [8] This term stands for pointer swizzling in object oriented databases and operating systems [2] [11] In stacking HTML objects, pointer swizzling is needed. Let us consider the example in Figure 4. In Figure 4, there are three bottom objects, Object a1,a2,a3. On those three objects, Object b1, b2, b3 are stacked, respectively. Object a1 includes the reference to Object a2. In other words, ....

R.G.G.Cattell: "Object Data Management", Addison-Wesley (1991).

.... offering significantly increased data modeling capabilities, but moved back to a procedural query language, and shifted the access optimization problem back to the user [Ull88] There has been a lot of work done on object oriented databases, and several systems have reached the marketplace [MSOP86, WLH90, AG89, Cat91, BDK92, OHMS92]. Most of the object oriented systems have attempted to provide a declarative SQL like query language: OSQL in IRIS [WLH90] CQL in ODE [DGJ92] the O 2 query language in O 2 [BDK92] and XSQL in UniSQL [KKS92] However no more general query language has been defined, and there is a general ....

R. C. G. Cattell. Object Data Management. Addison-Wesley, 1991.

....with respect to the DL semantics is manifest. 3.4. 3 Implementation issues Attributes vs Relationships Relationships are not first class individuals in the ODMG 93 standard; they are not explicitly defined but represented by a pair of reference attributes of the classes they relate (see [Cat94a] 6 Roughly speaking, given an interpretation and a formula, the model checking problem consists of verifying that the interpretation is a model for that formula. 41 Example 13 For instance, author is a many to many relation connecting the classes Documents and Persons. Using the ODMG 93 ....

R. G. G. Cattell. Object Data Management. Addison-Wesley, Reading, MA, 1994. 82

....performance issues for OODBMSs and the evaluation through benchmarks. We implemented a prefetching environment into the EXODUS Storage Manager, which is briefly described in Section 2.8. Finally, in Section 2.9 we summarise this chapter. 2. 1 Objects The term object has many meanings in OODBMSs [Cattell, 1994]. The following two terms are used in all systems: 1. Object Grouping. Objects can serve to group data that pertain to one real world entity a transistor, a document or a person. A weak form of object grouping is incorporated in implementations of the relational model that have primary and ....

....or a group of objects. The object server stores objects in units of pages or segments on disk. The advantage of this design is that there are no unneeded objects in the client buffer pool and it is a finer granularity for locking. This technique is employed by Versant [Versant, 1992] UniSQL [Cattell, 1994], Thor [Liskov et al. 1996] ORION [Kim et al. 1994] and ITASCA. 2. A Page Server Architecture. A page server system transfers pages between client and server and has a page buffer pool at client and server. A database page is divided into slots and data. The slots have information about the ....

Cattell, R. (1994). Object Data Management. Addison-Wesley.

....in the last few years, mainly due to its inapplicability to new application areas, such as CAD, CASE, software management, office document systems, etc. The object oriented database systems (OODBMS) are claimed to be superior in these fields, with respect to both data semantics and performance [2, 4, 13]. It has been argued that also the traditional commercial applications should switch to the new generation of DBMSs. The object data model is semantically much richer, offering a large selection of modelling tools. However, a consequence of the richness is the difficulty of integrating it in a ....

....5. The paper ends with a discussion on further work. 2 Dimensions of modelling In order to develop a formalism for representing objects, we must gather up all the features that we want to show. There are several variants of object data models, but most of them contain the same structuring tools [4]. These tools can be best understood as type generators, adopted from programming languages: ffl aggregation (composition) of a fixed number of components of varying types, ffl collection (repetition) of a varying number of elements of the same type, ffl union (generalization) of types, ffl ....

Cattell, R.G.G.: "Object Data Management", Addison-Wesley, 1992.

....it has become invisible within the dynamic model. There is thus a clear impedance mismatch between the static and dynamic models. The term is borrowed from the database literature, where it is used to refer to the gap between an application programming language and a database query language. [10]) This mismatch is continued from the dynamic model to the implementation, since the former provides no clear guidance as to how to arrive at the latter. It should be emphasized that the problem is an inherent methodological dilemma, not necessarily limited to some contrived example, nor to the ....

Cattell RGG, Object Data Management, Addison-Wesley, 1991.

....pages to determine which data objects fall within the query range, and responds with a list of qualifying object IDs. We assume that an object ID is in the common structured form, i.e. it contains a physical page number in its higher order bits and a logical slot number in the low order bits [1], so that the page in which an object resides is indicated by its ID. The client processes the received list of objects IDs sequentially, as in the case of the next operation on a cursor, and requests the server for the data page of an object missing from its local cache. Any index entry delete ....

R.G.G. Cattell, Object Data Management, Addison Wesley, Reading, MA, 1991.

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Cattell, R. G. G., Object Data Management , Addison-Wesley, Reading, MA, 1994.

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Rick Cattell, Object Data Management, Addison Wesley, 1991.

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R.G.G. Cattell. Object Data Management, 2nd edition. Addison-Wesley, 1994.

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R. G. G. Cattell, Object Data Management, p.94, Addison-Wesley, 1992

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R.G.G. Cattell. Object Data Management, 2nd edition. Addison-Wesley, 1994.

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Cattell, R. G. G., "Object data management", Addison-Wesley, 1991

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