External Database System - Revision history

Thomas Linder Puls: sources

2020-05-18T15:31:51Z

sources

← Older revision		Revision as of 17:31, 18 May 2020
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	~~'''Download''' source files~~ of ~~the example project used in~~ this tutorial:		The chainDB database is only available in the Commercial Edition. The sources of this tutorial is supplied as an example: '''Help -> Install Examples...'''

	* Visual Prolog 7.4 and 7.3 install examples in the IDE:
	*:'''Help -> Install Examples...'''
	* [http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].
	* [http://http://download.pdc.dk/vip/71/examples/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.1 version].

	In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.		In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.

Thomas Linder Puls: category

2016-03-04T10:13:58Z

Thomas Linder Puls: 7.4

2012-12-02T22:41:42Z

7.4

← Older revision		Revision as of 00:41, 3 December 2012
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	'''Download''' source files of the example project used in this tutorial:		'''Download''' source files of the example project used in this tutorial:

	[~~http://~~http://download.pdc.dk/vip/~~71/examples~~/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.1 version].		* Visual Prolog 7.4 and 7.3 install examples in the IDE:
			*:'''Help -> Install Examples...'''
	[http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].		* [http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].
			* [http://http://download.pdc.dk/vip/71/examples/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.1 version].

	In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.		In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.

Thomas Linder Puls: Visual Prolog External Database System moved to External Database System

2011-08-12T08:12:42Z

Visual Prolog External Database System moved to External Database System

← Older revision	Revision as of 10:12, 12 August 2011
(No difference)

Elizabeth Safro at 16:26, 13 November 2008

2008-11-13T16:26:09Z

← Older revision		Revision as of 18:26, 13 November 2008
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	[http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].		[http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].


	In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.		In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.

Elizabeth Safro: example links

2008-11-13T16:15:06Z

example links

← Older revision		Revision as of 18:15, 13 November 2008
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	'''Download''' [http://download.pdc.dk/vip/71/examples/tutorial_examples/chainDbTutorial.zip ~~source code~~] ~~of the example project~~.		'''Download''' source files of the example project used in this tutorial:

			[http://http://download.pdc.dk/vip/71/examples/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.1 version].

			[http://download.pdc.dk/vip/72/tutorial_examples/chainDbTutorial.zip Visual Prolog 7.2 version].


	In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.		In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.

Elizabeth Safro at 12:14, 11 September 2008

2008-09-11T12:14:11Z

← Older revision		Revision as of 14:14, 11 September 2008
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			'''Download''' [http://download.pdc.dk/vip/71/examples/tutorial_examples/chainDbTutorial.zip source code] of the example project.

	In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.		In this tutorial, we cover Visual Prolog external database system. An '' external database'' is composed of an external collection of chained terms; these chains give you direct access to data that are not a part of your Prolog program. The external database can be stored in any of two locations: in a file or in a memory. The external database supports B+ trees, that provide fast data retrieval and an ability to sort quickly, and it supports multi-user access by a mechanism for serializing the file accesses inside transactions.

Thomas Linder Puls: Domain table

2007-08-26T00:17:23Z

Domain table

← Older revision		Revision as of 02:17, 26 August 2007
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	The first user that opens the file determines DenyMode for all subsequent attempts to open the file, and a run-time error will occur if reopened in an incompatible mode. The following table summarizes the results of opening and subsequently attempting to reopen the same file for all combinations of DenyMode and AccessMode:		The first user that opens the file determines DenyMode for all subsequent attempts to open the file, and a run-time error will occur if reopened in an incompatible mode. The following table summarizes the results of opening and subsequently attempting to reopen the same file for all combinations of DenyMode and AccessMode:

	~~ND, 3RD, ........ REOPEN denyAll denyWrite denyNone R RW R RW R RW1<br />~~		{\| border="1" cellpadding="5" style="border-collapse: collapse" bordercolor="#111111" cellspacing="0"
	~~s<br />~~		!Domain
	~~t<br />~~		!What it is Used For
	~~<br />~~		\|-
	~~O<br />~~		\|bt_selector
	~~P<br />~~		\|Unique value for B+ tree selectors returned by bt_open
	~~E<br />~~		\|-
	~~N denyAll R N N N N N N RW N N N N N N denyWrite R N N Y N Y N RW N N N N Y N denyNone R N N Y Y Y Y RW N N N N Y Y~~		\|place
			\|Location of the database: in RAM or in a file
			\|-
			\|accessmode
			\|Decides how the file will be used
			\|-
			\|denymode
			\|Determines how other users can open the file
			\|-
			\|ref
			\|Reference to the location of a term in a chain
			\|}

	====Transactions and Filesharing====		====Transactions and Filesharing====

Thomas Linder Puls: Move from WEB

2007-08-25T23:43:25Z

Move from WEB

Show changes

← Older revision		Revision as of 12:13, 4 March 2016
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	*File sharing is done by grouping the predicates that access the database into transactions.		*File sharing is done by grouping the predicates that access the database into transactions.

	~~==References==~~		[[Category:Data types and handling]]

	[[Category:~~Tutorials~~]]