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	Cheshire II Commands
		Virtual databases rely on the configuration files of the underlying physical databases to determine if a search or display format request is possible for the given database.
		Virtual databases may also include EXPLAIN information (as the example shows), but need not have DTDs, indexes, etc. specified (if these are specified, they are ignored).
		For virtual databases to be used with webcheshire all of the FILEDEFs for the physical databases must be included in the file referenced but the "CHESHIRE_CONFIGFILE" variable.
	cheshire.lib.berkeley.edu /virtual.html (276 words)

	Cheshire II Commands
		Virtual databases rely on the configuration files of the underlying physical databases to determine if a search or display format request is possible for the given database.
		Virtual databases may also include EXPLAIN information (as the example shows), but need not have DTDs, indexes, etc. specified (if these are specified, they are ignored).
		For virtual databases to be used with webcheshire all of the FILEDEFs for the physical databases must be included in the file referenced but the "CHESHIRE_CONFIGFILE" variable.
	cheshire.berkeley.edu /virtual.html (276 words)

	PJ Murray's Weblog : Weblog
		Virtual Database Technology CodeFutures has a real bias for clever technologies (anybody interested in a cool DAO generator?).
		CodeFutures has recently worked with virtual databases, which is a very clever technology.
		The product is aimed at database administrators (there's an emphasis on usability and reproducing the look and feel of a traditional relational databae) and should not be too difficult for Java developers to master.
	jroller.com /page/CodeFutures?entry=virtual_database_technology (362 words)

	The Virtual Lawyer - Database Duplicity
		Because a database is a "compilation" of preexisting materials or data, protection only runs to the way the data is selected, coordinated or arranged.
		The European Union has been fumbling for a couple of years with database protection and even passed a "directive" on the subject that attempts to maintain a balance between a free flow of information and commercial protection of databases.
		But wait, if the database maker changes the database in a "commercially significant" way, then he can claim that the twenty-five years runs from the date of the change.
	www.clarionmag.com:8080 /col/97-10-virtuallawyer.html?pFriendly=true (765 words)

	The Virtual Education Database (Site not responding. Last check: 2007-10-26)
		The Virtual Ed Database is maintained by the
		The database is searchable in in a variety of ways:
		Or by typing a word or part of a word in either the site name text box or the URL text box.
	virtual.parkland.edu /dvl/virtualed.htm (69 words)

	Federated database system - Wikipedia, the free encyclopedia
		A federated database (or virtual database) is the fully-integrated, logical composite of all constituent databases in a federated database system.
		Through data abstraction, federated database systems can provide a uniform front-end user interface, enabling users and clients to store and retrieve data in multiple noncontiguous databases with a single query--even if the constituent databases are heterogeneous.
		To this end, a federated database system must be able to deconstruct the query into subqueries for submission to the relevant constituent DBMS's, after which the system must composite the result sets of the subqueries.
	en.wikipedia.org /wiki/Federated_database_system (397 words)

	OVERVIEW OF A DATABASE SYSTEM FOR MAGNET MEASUREMENTS
		The database schema for this is comprised of specialized schema for different magnet measurements plus a set of general schema which services all the measurement hardware systems.
		A database schema must declare the tables in which data is to be stored and specify the columns (attributes) which are to be described in that table, the relations between columns in that table and other tables in the schema, and permissions, indices, keys and related details of the table specification.
		These are in the `tot' virtual database and the tables of interest include the dataowners table, the tables table and the columns table.
	tdpc01.fnal.gov /theis/mtf_database_overview.htm (8910 words)

	Virtual network file server - Patent 6356863 (Site not responding. Last check: 2007-10-26)
		The virtual file server essentially comprises a process by which the contents of a file from a remote file system can be generated and returned in response to a file system request.
		Indeed, the server is free to internally represent the database in a very efficient compressed format, for example, removing duplicate sequences, Huffman or bit-wise encoding of residues, and representing sequences that are subsequences of another as a reference to the location within the parent.
		However, the virtual network file server is also advantageously able to handle such file system "housekeeping" requests 260 by selectively choosing 290 and calling 300 a plug-in and thereafter encoding a reply 320 therefrom, thus freeing other plug-ins of the task of implementing trivial or common functionality.
	www.freepatentsonline.com /6356863.html (11126 words)

	Primer: The Virtual Database
		Like a database, only instead of being comprised of software that knows how to manage data plus a physical place to keep that data, a virtual database has only software.
		One also might make the analogy that a virtual database is to a set of databases as a view is to a set of physical tables.
		By contrast, a virtual database connects an application directly to the sources of data.
	www.baselinemag.com /article2/0,3959,1111900,00.asp (1016 words)

	Geeking with Greg: MySQL Cluster and my big virtual database
		MySQL Cluster is an in-memory database running across a cluster of machines that tries to be robust to failures of nodes.
		Unsurprisingly, MySQL Cluster is not a giant, simple, virtual database that runs transparently over a cluster, nodes dropping in an out of service at will, with read-write replication and data migration all done automatically and robustly.
		It may not be a big, virtual database, but it is a big step in the right direction.
	glinden.blogspot.com /2006/05/mysql-cluster-and-my-big-virtual.html (819 words)

	Geeking with Greg: I want a big, virtual database
		What I want is a robust, high performance virtual relational database that runs transparently over a cluster, nodes dropping in an out of service at will, read-write replication and data migration all done automatically.
		I want to be able to install a database on a server cloud and use it like it was all running on one machine.
		While not suited for Google-size databases, it does pretty transparently turn a rack of blades into a single database, with good scalability, reasonable performance, and fair reliability.
	glinden.blogspot.com /2006/03/i-want-big-virtual-database.html (731 words)

	The Virtual Database Engine of SQLite
		The virtual machine in SQLite version 3.0 and 3.1 is very similar in concept but many of the opcodes have changed and the algorithms are somewhat different.
		P1 is the database number (0 for the main database).
		This instruction pops the database number to use (0, the main database) from the top of the stack, so afterwards the stack is empty again.
	www.sqlite.org /vdbe.html (7302 words)

	Virtual Private Database
		The database administrator must already have a good understanding of Oracle's Virtual Private Database features and principles before setting up the virtual private database for NDS Applications.
		While configuring and using the virtual private database is fairly straightforward, migrating a separate-schema fulfillment system to a single schema presents some challenges.
		To implement the virtual private database for the fulfillment environment in NDS Applications, the Tenant ID is the element which identifies the master or client environment.
	www.ndsapps.com /webhelp/vpd.htm (645 words)

	SERVICES - Virtual Machines, Virtual Private Servers
		With a virtual server, you can easily isolate beta or early development code and not worry about needing to buy extra machines just for a safe testing environment.
		With VM servers, it is easy to configure virtual database, web, and application processing servers all connected together on a private virtual network that only you control.
		Of course, that means in your role as "virtual administrator" you must apply all the same service packs, fixes, and updates that you would use with a regular server and you must securely "lockdown" the server exactly the same way.
	www.voicegateway.com /services/virtual_machines/default.htm (843 words)

	VWN Resource Database: Augmenting Virtual Existence
		The UIC College of Dentistry is planning to test a new virtual reality dentistry simulation that all...
		For many, the persistent virtual realities available today, just are not immersive enough, or do not cater to their needs, or are just too plain demanding for their hardware.
		Almost any virtual environment can be upgraded, beyond it’s maker’s dreams, by modifications and enhancements put in place by the user.
	www.virtualworldlets.net /Resources/Menu.php?Category=23 (555 words)

	About extending a virtual server
		Before you extend the first virtual server on a server computer, you must create or connect to a configuration database; subsequent virtual servers do not have to be separately registered with the configuration database.
		Generally, you extend a virtual server because you need to add more capacity to your server, whether that server is a departmental server or one of many in your server farm.
		This means that if virtual server A contains the paths /teams, /sites, and /users, when you extend virtual server B and connect to the content database for virtual server A, virtual server B will also have the /teams, /sites, and /users paths.
	www.nv.doe.gov /_vti_bin/help/1033/sts/html/wsgpupgd.htm (1232 words)

	Pictorial: Configuring VirtualAppliance.net's PostgreSQL Server
		I've been hearing about virtual appliances for quite some time now and their use has always held a particular fascination for me. However, it wasn't recently that I had the time to start using them in a serious way.
		I envision using virtual appliances to reduce the complexity invovled in switching databases.
		If I need to create a virtual network of four or five appliances to test clustering or failover, I want each appliances to be as slim as possible.
	virtualappliances.org /Using_Database_Virtual_Appliances/Configuring_VirtualAppliance_PostgreSQL_Server.html (1320 words)

	13 Using Virtual Private Database to Implement Application Security Policies
		Virtual private database (VPD) enables you to enforce security, to a fine level of granularity, directly on tables, views, or synonyms.
		The database user SYS is thus always exempt from VPD or Oracle Label Security enforcement, regardless of the export mode, application, or utility used to extract data from the database.
		Although all database sessions and audit records are initiated as One Big Application User, each session can have attributes that vary, depending on who the real end user is. This model works best for applications that have a limited number of users and where sessions are not reused.
	www.stanford.edu /dept/itss/docs/oracle/10g/network.101/b10773/apdvpoli.htm (5386 words)

	seeMore ... Virtual Database For Enterprise Information Integration (EII)
		The seeMore Virtual Database Server provides application developers and IT managers with the ability to access, view and update multiple data sources enterprise-wide as if they were a single database of information.
		Once the seeMore Virtual Database Server is configured, it provides end-users and applications with the ability to transparently access any corporate-wide data they need - without knowing specifically where the data is located - and without worrying about its format.
		The seeMore Virtual Database Server allows the ability to perform heterogeneous joins when a query needs to pull data from multiple or heterogeneous sources and integrate it into a single view of information before passing it back to the end-user application.
	www.seemoretechnologies.com /virtual-database (825 words)

	The Virtual Lawyer - Database Duplicity
		Reproduction in any form without the express written consent of CoveComm Inc., except as described in the subscription agreement, is prohibited.
		The Virtual Lawyer - The Geeks Shall Inherit the Earth
		The Virtual Lawyer - The Hangman and the Rope
	www.clarionmag.com /col/97-10-virtuallawyer.html (898 words)

	Virtual Private Database VPD HIPAA
		The information is presented to the user in such a way that the user does not even see anything for which he or she is not authorized.
		This is analogous to a virtual set of tables for each named user, and therefore a virtual database.
		This setup is known as Virtual Private Database, since it offers a private view of the database to the users based on some filtering criteria.
	www.rampant-books.com /aud_255.htm (342 words)

	tbox_HDFDatabase
		If the specified key does not exist in the database then an error message is printed and the program exits.
		If the specified key does not exist in the database or is not an integer array, then an error message is printed and the program exits.
		If the key already exists in the database, then the old key record is deleted and the new one is silently created in its place.
	www.c3.lanl.gov /~pernice/samrai/docs/manual/html/tbox_HDFDatabase.html (2252 words)

	Oracle9i Security Products and Features
		Database security entails permitting or denying user actions on the database and the objects within it.
		Database integrity mechanisms also guarantee that all steps in a transaction are committed as a complete unit, so that either all parts are committed or all parts are rolled back (transaction integrity).
		Of course, each session--from the database standpoint--is created as the same database user, so that the ability to use roles, database auditing, and so on, is greatly diminished for reasons previously enumerated.
	download-west.oracle.com /docs/cd/B10501_01/network.920/a96582/galsyste.htm (10484 words)

	OpenLink Virtuoso (Product Blog)
		Significant rewrite of database engine resulting in 50%-100% improvement on single CPU and in some cases up to 300% on multiprocessor CPUs by decreasing resource-contention between threads and other optimizations.
		With the 80 warehouse database, it took about 18 minutes for the system to reach steady state, with a warm working set, hence the actual steady rate is somewhat higher than 49K, as the warm up period was included in the measurement.
		Since for any large database with a few G of working set the warm up time is easily 30 minutes, the warm up time should be mentioned but not included in the metric.
	www.openlinksw.com /weblogs/virtuoso (4937 words)

	Virtualmin Virtual Servers Module (Site not responding. Last check: 2007-10-26)
		The only thing missing is the configuration for a virtual mapping database and, if using quotas, moving the spool directory to the same partition that user data lives on.
		New IP-based virtual domains will be configured to listen on the network interface specified here, and new virtual IP addresses will be added to this interface.
		Thus, if the basic service level of a virtual host includes 5 mailboxes, then the server quota should probably be five times the quota for the individual users so that all of them can use their full quota.
	www.swelltech.com /support/virtual-servers/index.html (3269 words)

	Database of Sources
		Use the search box above to query our database of resources for finding legal or factual information or information about companies or people.
		Use the site search engine to expand your query to other resources available on The Virtual Chase.
		Disclaimer: The materials in The Virtual Chase® are informational and provided "as is" without express or implied warranty.
	www.virtualchase.com /topics/index.html (106 words)

	Virtual Link - Saint Louis web design firm. (Site not responding. Last check: 2007-10-26)
		Virtual Link provides the tools necessary to enhance your visibility through interactive online and distributable media.
		Database solutions equip your business with the tools required to increase your productivity and reduce your workload.
		Virtual Link is available to address all your office needs.
	www.virtuallink-inc.com (431 words)

	Description of SQL Virtual Server client connections
		To ensure that a database is recovered in a consistent application state, use database transactions so that failover occurs in the database correctly and in a consistent state.
		When a virtual database server fails, a connection link failed error message is returned to the waiting client.
		If a client attempts to connect to the server while a database is being recovered, the client receives a waiting for database recovery error message and should retry after a short pause.
	support.microsoft.com /kb/273673 (1539 words)

	OpenLink Universal Integration Middleware - Virtuoso Product Family - Virtual Database
		Virtuoso's core is a pioneering Virtual Database Engine that uses industry-standard data-access technologies to provide transparent access to disparate SQL, XML, Free Text and other data sources.
		Virtuoso hides SQL dialect differences across external databases.
		Virtuoso imposes virtually no performance overhead when deployed as an intermediary; SQL operations are passed to remote databases unchanged whenever possible.
	virtuoso.openlinksw.com /main/vdbms/index.htm (283 words)

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