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Topic: Hierarchical database

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	Hierarchical model - Wikipedia, the free encyclopedia
		A hierarchical database is a kind of database management system that links records together in a tree data structure such that each record type has only one owner (e.g., an order is owned by only one customer).
		Hierarchical structures were widely used in the first mainframe database management systems.
		Hierarchical relationships between different types of data can make it very easy to answer some questions, but very difficult to answer others.
	en.wikipedia.org /wiki/Hierarchical_database (238 words)

	Lecture 14 (Site not responding. Last check: 2007-10-22)
		The hierarchical sequence is also important because hierarchical data-manipulation languages, such as that used in IMS, use it as a basis for defining hierarchical database operations.
		For example, a hierarchical database occurrence of the hierarchical schema shown in Figure D.4 would consist of a number of occurrence trees similar to the one shown in Figure D.5, one for each distinct department.
		A PCR type is usually implemented by using the hierarchical sequence, whereas a VPCR type is usually implemented by establishing a pointer (a physical one containing an address, or a logical one containing a key) from a virtual child record to its virtual parent record.
	carbon.cudenver.edu /~esbrowde/csc4287/lectures/lecture20.html (2022 words)

	Hierarchical database conversion with conditional write - Patent 4908759
		More specifically, a hierarchical database is defined as an ordered set of data wherein elements of data in the set are composed of different occurrences of a single type of database format.
		5 is a pictorial representation of the input database of FIG.
		A convention of a hierarchical database is that of placing the length of the overall segment at the front of a variable length segment to aid in keeping track of the data within the segment.
	www.freepatentsonline.com /4908759.html (9340 words)

	Database Models: Hierarcical, Network, Relational, Object-Oriented, Semistructured, Associative and Context.
		In such database there is no clear separation between the data and the schema, and the degree to which it is structured depends on the application.
		Such databases subsume the modelling power of recent extensions of flat relational databases, to nested databases which allow the nesting (or encapsulation) of entities, and to object databases which, in addition, allow cyclic references between objects.
		Because main addressed unit of context database is an Object, the pointer is made to Object instead of a field of this Object.
	unixspace.com /context/databases.html (2376 words)

	hierarchical (Site not responding. Last check: 2007-10-22)
		The hierarchical model will handle network structures only through some tricks, but this is not a big problem because the majority of relationships are indeed hierarchical.
		In a nutshell, the hierarchical model is old, but like the Houston, Texas highway system, it is there, it works, and it will be hard to replace.
		Amend the original database description by adding a logical child (this is emplproj which appears as a logical parent in the diagram.) 3.
	www.cbi.msstate.edu /faculty/karnett/hierarchical.htm (796 words)

	DBAzine.com: IMS Concepts and Database Administration
		In a hierarchical database, data is grouped in records, which are subdivided into a series of segments.
		In a hierarchical database, the structure of the database is designed to reflect logical dependencies-certain data is dependent on the existence of certain other data.
		In a hierarchical database, an attempt is made to group data in a one-to-many relationship.
	www.dbazine.com /ofinterest/oi-articles/ims1 (5035 words)

	Scribe Notes on Distributed Search over the Hidden Web: Hierarchical Database Sampling and Selection.
		Every database has got a content summary or itself, which includes the document frequencies (number of documents the word appears in the database) of all the words in the database.
		It does this by looking into the content summary of the databases and then mapping the user query words with the content summary query words and then taking the rank factor into consideration and then giving out the database where the relevant retrieved documents are more for that particular query.
		Future work would be to find out methods for the better construction of the content summaries and database selection schemes because some queries may be in such a way that the compute may not be able to figure out what the query is about and to look into which sort of data base.
	ir.iit.edu /~waigen/classes/cs595f03/100903_3.html (697 words)

	Database Models (Site not responding. Last check: 2007-10-22)
		The theory behind the relational database model is discussed the section entitled 'Characteristics of a Relational Database'; this section focuses on the distinctions between the relational model and other database models
		If you are using a non-relational database, you probably have to modify the application that will access this information by including 'pointers' to the new data.
		With a relational database, the information is immediately accessible because it is automatically related to the other data by virtue of its position in the table.
	www.frick-cpa.com /ss7/Theory_Models.asp (2781 words)

	Technology review: Databases
		A small company maintaining its own database is probably not a big risk at the basic technical level provided it can demonstrate the capabilities for creating the right data structures reliably and flexibly.
		Free Form databases have no structure and thus the advantages of a relational structure to create authority files where data is kept just once and concepts such as global edit and heading merge are not easy to achieve.
		The database management functions are closely coupled with the application language and as a result Mumps is a very fast and efficient database management environment.
	www.biblio-tech.com /html/databases.html (2454 words)

	iAnywhere.com - Hierarchical database configurations (Site not responding. Last check: 2007-10-22)
		For databases in a hierarchical configuration, every database has a single parent database, except the consolidated database, which has no parent.
		For any two databases directly sharing data in a hierarchical configuration, one is always above or below the other in the hierarchy.
		Remote databases can contain tables that are not present at the consolidated database as long as they are not involved in replication.
	www.ianywhere.com /developer/product_manuals/sqlanywhere/0902/en/html/dbfgen9/00000033.htm (198 words)

	Understanding IMS-DL/I Essentials : IMS-DL/I: A Hierarchical Database (Site not responding. Last check: 2007-10-22)
		An IMS-DL/I database is a large, centralized collection of information comprising one or more physical files that can be accessed by the SAS/ACCESS interface to IMS-DL/I. An IMS-DL/I database is a hierarchical database: one where information is structured in records that are subdivided into a hierarchy of related segments.
		Ideally, information in the database records is subdivided into segments and fields on some logical basis, either by the inherent structure of the data or by consideration of the uses to which the data will be put.
		You can think of a hierarchical database as one that starts at the top with general information about the item, individual, or case.
	www.sph.emory.edu /computing/unix/sas/sas8OnlineDoc/imsdi/hierdb.htm (200 words)

	Virginia M. Werner - CISB 250 C02 - LCC
		A database model is a collection of logical constructs used to represent the data structure and the data relationships found within the database.
		A tree structure is represented as a hierarchical path on the computer’s storage media.
		The relational database is perceived as a collection of tables.
	www.lansing.cc.mi.us /~wernerv/cisb250/c250c02.htm (531 words)

	Welcome to NeuroSys (Site not responding. Last check: 2007-10-22)
		Because of the hierarchical and inherently predictable XML data structure used for all internal annotation, it is possible for NeuroSys to generate and extend the data-entry and data-query GUI screens automatically and dynamically.
		The NeuroSys database environment is particularly suited for the creation of databases which support collaboration between members of distributed peer groups.
		NeuroSys uses an open-source 'back-end database' that is publicly available for unrestricted use at no cost.
	neurosys.cns.montana.edu (558 words)

	mmDb (MoreMotion Hierarchical Database) (Site not responding. Last check: 2007-10-22)
		In the hierarchical structure, first of all, records are grouped.
		In conventional (relational) databases a column can be type of "currency".
		If a node is mapped to an external data source (a java class, a relational db, or an another mmDB), that means the node gathers required information from that data source.
	www.c-art.com /moremotion/mmdb.html (601 words)

	ITtoolbox Blogs
		I got my first taste of the world of hierarchical database programming when a job-shop in Boston found me an assignment with GTE-Sylvania, a big electronics firm that needed programming help for the database they were building.
		These database programs were complicated designs; working on three different ones simultaneously was something like playing three games of three-dimensional chess at the same time.
		Database was not a choice, not when you really looked at it.
	blogs.ittoolbox.com /common/print.asp?i=000650.asp (1128 words)

	"Hierarchical Database Resource Manager" 2.6 (Site not responding. Last check: 2007-10-22)
		This distributed object access function can extract subsets of data from a hierarchical database as objects, distribute and maintain copies of that data at several places in the network, and send updates back to the hierarchical database when needed.
		Hierarchical data is repackaged as objects, placed in a persistent cache, and managed on a local server.
		The object remains on the server unless it is requested that the hierarchical database be updated with the changes contained in the data object.
	www.memphis-schools.k12.tn.us /admin/it/division/www/id1p1/2_6.htm (489 words)

	mmDB - Hierarchical Java Database
		A database created on one platform can be easily transported to another by simply copying its files.
		However mmDB is a native hierarchical database and constructing a product catalog with mmDB is straight-forward even for an ordinary computer user.
		In a currency type field of a conventional (relational) database you are able to store only one type of currency.
	www.moremotion.com /moremotion/products/advsuite/mmdb/features/f1.html (534 words)

	"Hierarchical Database Resource Manager" 2.10 (Site not responding. Last check: 2007-10-22)
		The Hierarchical Database Management System and the distributed environment in which it runs are easily manageable and able to accommodate a wide variety of environments.
		The hierarchical distributed structure can also be implemented on large networks and can use the largest individual processors or parallel sysplex to provide the highest performance and most cost-effective solution.
		Distributed hierarchical support allows transparent access of hierarchical data between a client requester to either LAN or host servers, or both.
	www.memphis-schools.k12.tn.us /admin/it/division/www/id1p1/2_10.htm (335 words)

	dBforums - Database planning - Hierarchical problem - Help needed...
		I tried a modified preorder tree traversal algorithm but since it's not hierarchical anymore, i don't manage to get it to work...
		One table tracks information about a specific employee, a separate table tracks the relationships between employees (it has two foreign keys, one FK to the employee and a second FK to the employee's supervisor).
		For your application, though, it is not likely to happen and it should be easy for people to "see" the problem, but it is a potential problem.
	www.dbforums.com /t1067695.html (342 words)

	Slashdot \| With XML, is the Time Right for Hierarchical DBs?
		Hierarchical databases were blown away by relational versions because it was difficult to model a many-to-many relationship - the very basis of the hierarchical model is that each child element has only one parent element.
		Harddrive partitioning for such databases as oracle work out perfectly with the cylinder, sector, and tracks of a hard drive to allow for the fastest read/write times as can be possible.
		The question of whether to use a hierarchical, relational or object-oriented data structures misses the point for textual data, for which XML is commonly used, because none of these structures capture meaning.
	slashdot.org /askslashdot/01/11/15/1943223.shtml (5229 words)

	Citations: Restructuring hierarchical database objects - Abiteboul, Hull (ResearchIndex) (Site not responding. Last check: 2007-10-22)
		Moreover, it was shown in [KV85] that every database schema that has cyclic references is query equivalent (with respect to a well defined query language which is given in [KV93] to a database schema without any cyclic references; the concluding remark in [KV85] is: But it is not clear that....
		A discussion of transformations between ER model and the relational model can be found in [19] Before turning to examples of integration of biological databases, we should also remark that the cost of integration is also influenced by whether it is an autonomous or cooperative integration....
		Our work with database transformations arising in the Human Genome Project (17] indicates that there is a need to implement....
	citeseer.ist.psu.edu /context/43565/0 (3210 words)

	DBReader Free Download-A hierarchical database browser. (Site not responding. Last check: 2007-10-22)
		DBReader is a hierarchical database browser with editing capabilities.DBReader provides the end user with a fully integrated set of development tools for data manipulation and data definition.
		Complete with a metadata view of the underlying data structure, the end user is presented with a total overview of the data environment.
		Column details with datatypes, default values, nullability, etc. 4.Explore database structure in a tree (tables, views, columns, indexes, procedures, etc.) 5.Enter SQL statements to query a database, and edit the result set of a query.
	www.justdosoft.com /DBReader-12120.html (423 words)

	"Hierarchical Database Resource Manager" 2.5 (Site not responding. Last check: 2007-10-22)
		This replication function can extract subsets of data from a hierarchical database, and distribute and maintain copies of that data at several places in the network.
		Continual update, with the data capture facilities of the database manager, captures relational or hierarchical data as changes occur, maps that data to a corresponding database, and updates the corresponding database.
		One example of the use of the Hierarchical Database resource manager support for the replication function is through the IBM Data Refresher and Data Propagator products.
	www.memphis-schools.k12.tn.us /admin/it/division/www/id1p1/2_5.htm (531 words)

	ONLamp.com: Hierarchical SQL (Site not responding. Last check: 2007-10-22)
		This was the basis for all serious, large-scale DP work, so people assumed that if SQL could not handle such structures, it would never be a serious production tool.
		You might use it for a reporting tool or something off to the side, but not as the main database for the enterprise.
		Well, IMS is still out there and it holds a lot of data, but SQL has moved into serious production databases.
	www.onlamp.com /pub/a/onlamp/2004/08/05/hierarchical_sql.html (978 words)

	Dynamic Hierarchical Database Architecture for Location Management in PCS Networks (Site not responding. Last check: 2007-10-22)
		However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
		This method effectively reduces the signaling and database access overhead for location registration and call delivery.
		Besides, the required processing is handled by a distributed network of directory registers and centralized coordination is not necessary.
	www.comsoc.org /net/private/1997/oct/646_05net05-ho.html (429 words)

	Omniseek: /Computing /Data Formats /Database /Hierarchical /
		CERES is in the process of evaluating existing thesauri and building a general environmental thesaurus for use in metadata and searching tools.
		The following is a hierarchical listing of all the pages in this web t...
		The IMS Family of products includes IMS, the hierarchical database and transaction server, and a growing number of database middleware products.
	www.omniseek.com /srch/{20686} (479 words)

	A Day in the Life of a DW Architect: Historical Lessons & Current Applications: March 2004 Archives
		The 70's - THE HIERARCHICAL DATABASE MINEFIELD, conclusion
		Database hasn't changed that much at all since I helped invent it.
		These were the curse of databases during the legacy period, two decades ago, and now they’re sinking BCC’s nice new warehouse.
	blogs.ittoolbox.com /dw/architect/archives/2004_03.asp (3846 words)

	Dynamic Load Balancing in Hierarchical Parallel Database Systems - Bouganim, Florescu, Valduriez (ResearchIndex) (Site not responding. Last check: 2007-10-22)
		Abstract: We consider the execution of multi-join queries in a hierarchical parallel system, i.e., a shared-nothing system whose nodes are shared-memory multiprocessors.
		In this context, the problem of load balancing is magnified and must be addressed within and among shared-memory nodes.
		47 Parallelism in relational database systems: Architectural is..
	citeseer.csail.mit.edu /93216.html (680 words)

	RE: hierarchical database for repository
		Basically, it'll take SAX events going in, store the data hierarchically (and in the right place in the DB), and then be able to spit SAX events back out from any given location.
		I don't want to be tied to a particular object representation of the information at this point, making the DOM a lot more than I need at this point.
		While an object database might be okay, it's not the 'object' part I care about - it's simply being able to store hierarchically linked nodes persistently.
	www.stylusstudio.com /xmldev/200001/post40260.html (391 words)

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