Page (File architecture) - Revision history

JAL: misc cleanup

2015-03-05T23:37:28Z

misc cleanup

← Older revision		Revision as of 23:37, 5 March 2015
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	<ul>		<ul>
	<li>6144 bytes of "usable" space (how the space is used depends on the table where the page resides)		<li>6144 bytes of "usable" space (how the space is used depends on the table where the page resides)
	<li>A 40 byte page trailer		<li>A 40-byte page trailer
	</ul>		</ul>

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	<li>The table that this page is part of, the numeric representation for which is as follows:		<li>The table that this page is part of, the numeric representation for which is as follows:
	<p>~~FCT~~ = ~~00,~~ Table ~~A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40, and Table X = 20.~~</p></li>		<table>
			<tr class="head"><th>Table</th><th>Number</th></tr>

	<li>The sequential page number within the table~~. Three~~ byte binary integer.		<tr><td>FCT</td><td>00</td></tr>
	<p>Because of <var>[[INCREASE command\|INCREASE]]</var> and <var>[[DECREASE command\|DECREASE]]</var> commands after the initial <var>CREATE</var>, the pages for a table might not be contiguous.</p></li>		<tr><td>Table A</td><td>01</td></tr>
			<tr><td>Table B</td><td>02</td></tr>
			<tr><td>Table C</td><td>03</td></tr>
			<tr><td>Table D</td><td>04</td></tr>
			<tr><td>Table E</td><td>40</td></tr>
			<tr><td>Table X</td><td>20</td></tr>
			</table></li>

			<li>The sequential page number within the table; a three-byte binary integer.
			<p>
			Because of <var>[[INCREASE command\|INCREASE]]</var> and <var>[[DECREASE command\|DECREASE]]</var> commands after the initial <var>CREATE</var>, the pages for a table might not be contiguous.</p></li>
	</ul>		</ul>

	[[Category:File architecture]]		[[Category:File architecture]]

Tbullock: Deleted the link; it is not that kind of initialize.

2015-03-04T01:01:01Z

Deleted the link; it is not that kind of initialize.

← Older revision		Revision as of 01:01, 4 March 2015
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	The page trailer contains the following:		The page trailer contains the following:
	<ul>		<ul>
	<li>The file name, which is the name used in the [[CREATE command: File\|create]] process. </li>		<li>The file name, which is the name used in the [[CREATE command: File\|create]] process.</li>

	<li>The date/time when the page was last ~~[[INITIALIZE command\|~~initialized]]. </li>		<li>The date/time when the individual page was last initialized.</li>

	<li>The date/time when the page was last written to the file. </li>		<li>The date/time when the page was last written to the file.</li>

	<li>Data used in the [[CHECKPOINT command\|checkpoint]] process. </li>		<li>Data used in the [[CHECKPOINT command\|checkpoint]] process.</li>

	<li>The table that this page is part of, the numeric representation for which is as follows:		<li>The table that this page is part of, the numeric representation for which is as follows:
			<p>FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40, and Table X = 20.</p></li>

	~~<p>FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40, and Table X = 20. </p> </li>~~		<li>The sequential page number within the table. Three byte binary integer.
			<p>Because of <var>[[INCREASE command\|INCREASE]]</var> and <var>[[DECREASE command\|DECREASE]]</var> commands after the initial <var>CREATE</var>, the pages for a table might not be contiguous.</p></li>
	<li>The sequential page number within the table.
	<p>
	Because of <var>[[INCREASE command\|INCREASE]]</var> and <var>[[DECREASE command\|DECREASE]]</var> commands after the initial <var>CREATE</var>, the pages for a table might not be contiguous. </p> </li>
	</ul>		</ul>


	[[Category:File architecture]]		[[Category:File architecture]]

Dme at 14:32, 10 May 2014

2014-05-10T14:32:22Z

← Older revision		Revision as of 14:32, 10 May 2014
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	All pages are 6184 bytes.		All pages are 6184 bytes.

	When a file is [[Creating a file ~~(File management)~~\|created]], the pages in the file are formatted into:		When a file is [[Creating a file\|created]], the pages in the file are formatted into:
	<ul>		<ul>
	<li>6144 bytes of "usable" space (how the space is used depends on the table where the page resides)		<li>6144 bytes of "usable" space (how the space is used depends on the table where the page resides)

JAL at 17:26, 24 January 2014

2014-01-24T17:26:08Z

← Older revision		Revision as of 17:26, 24 January 2014
Line 4:		Line 4:

	When a file is [[Creating a file (File management)\|created]], the pages in the file are formatted into:		When a file is [[Creating a file (File management)\|created]], the pages in the file are formatted into:
			<ul>
			<li>6144 bytes of "usable" space (how the space is used depends on the table where the page resides)
			<li>A 40 byte page trailer
			</ul>

	* 6144 bytes of 'usable' space (how the ~~space~~ is used ~~depends on~~ the ~~table where the page resides)~~		==The page trailer==
	* a 40 byte page trailer		The page trailer contains the following:
			<ul>
			<li>The file name, which is the name used in the [[CREATE command: File\|create]] process. </li>

	== The page ~~trailer ==~~		<li>The date/time when the page was last [[INITIALIZE command\|initialized]]. </li>

	The page ~~trailer contains:~~		<li>The date/time when the page was last written to the file. </li>

	* the file name, which is the name used in the [[CREATE command: File\|create]] process		<li>Data used in the [[CHECKPOINT command\|checkpoint]] process. </li>
	* the date / time when the page was last [[INITIALIZE command\|initialized]]
	* the date / time when the page was last written to the file
	* data used in the [[CHECKPOINT command\|checkpoint]] process
	* the table that this page is part of (a numeric representation as explained in Note 1 below)
	* the sequential page number within the table

	~~Note 1~~: ~~FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20.~~		<li>The table that this page is part of, the numeric representation for which is as follows:

	Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table might not be contiguous.		<p>FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40, and Table X = 20. </p> </li>

			<li>The sequential page number within the table.
			<p>
			Because of <var>[[INCREASE command\|INCREASE]]</var> and <var>[[DECREASE command\|DECREASE]]</var> commands after the initial <var>CREATE</var>, the pages for a table might not be contiguous. </p> </li>
			</ul>


	[[Category:File architecture]]		[[Category:File architecture]]

Admin: Admin moved page Page (File Architecture) to Page (File architecture) without leaving a redirect

2013-12-18T21:47:34Z

Admin moved page Page (File Architecture) to Page (File architecture) without leaving a redirect

← Older revision	Revision as of 21:47, 18 December 2013
(No difference)

Admin at 19:11, 16 December 2013

2013-12-16T19:11:18Z

← Older revision		Revision as of 19:11, 16 December 2013
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	All pages are 6184 bytes.		All pages are 6184 bytes.

	When a file is [[Creating a ~~File~~ (File ~~Management~~)\|created]], the pages in the file are formatted into:		When a file is [[Creating a file (File management)\|created]], the pages in the file are formatted into:

	* 6144 bytes of 'usable' space (how the space is used depends on the table where the page resides)		* 6144 bytes of 'usable' space (how the space is used depends on the table where the page resides)

ELowell: /* The page trailer */

2013-05-17T22:02:22Z

The page trailer

← Older revision		Revision as of 22:02, 17 May 2013
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	Note 1: FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20.		Note 1: FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20.

	Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table ~~may~~ not be contiguous.		Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table might not be contiguous.


	[[Category:File architecture]]		[[Category:File architecture]]

ELowell at 19:46, 16 May 2013

2013-05-16T19:46:30Z

← Older revision		Revision as of 19:46, 16 May 2013
Line 1:		Line 1:
	A page is the underlying structure applied to the data~~-set(s)~~ that comprise a Model 204 file.		A page is the underlying structure applied to the data sets that comprise a Model 204 file.

	All pages are 6184 bytes.		All pages are 6184 bytes.
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	* a 40 byte page trailer		* a 40 byte page trailer

			== The page trailer ==
	== The page ~~Trailer~~ ==

	The page trailer contains:		The page trailer contains:

	* the file name~~. This~~ is the name used in the [[CREATE command: File\|~~Create~~]] process		* the file name, which is the name used in the [[CREATE command: File\|create]] process
	* the date / time when the page was last [[INITIALIZE command\|initialized]].		* the date / time when the page was last [[INITIALIZE command\|initialized]]
	* the date / time the page was last written to the file		* the date / time when the page was last written to the file
	* data used in the [[CHECKPOINT command\|checkpoint]] process		* data used in the [[CHECKPOINT command\|checkpoint]] process
	* the table that this page is part of (a numeric representation ~~(see note~~ 1))		* the table that this page is part of (a numeric representation as explained in Note 1 below)
	* the sequential page number within the table		* the sequential page number within the table

			Note 1: FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20.

	~~Note 1: FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20.~~ Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.		Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.


	[[Category:File architecture]]		[[Category:File architecture]]

DCameron at 11:40, 16 May 2013

2013-05-16T11:40:01Z

← Older revision		Revision as of 11:40, 16 May 2013
Line 5:		Line 5:
	When a file is [[Creating a File (File Management)\|created]], the pages in the file are formatted into:		When a file is [[Creating a File (File Management)\|created]], the pages in the file are formatted into:

	* 6144 bytes of 'usable' space (how the space is used depends on the page ~~type~~)		* 6144 bytes of 'usable' space (how the space is used depends on the table where the page resides)
	* a 40 byte page trailer		* a 40 byte page trailer

Line 21:		Line 21:


	Note 1: FCT = 0, Table A = 1, Table B = 2, Table C = 3, Table D = 4, Table E = 5 and Table X = 6. Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.		Note 1: FCT = 00, Table A = 01, Table B = 02, Table C = 03, Table D = 04, Table E = 40 and Table X = 20. Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.


	[[Category:File architecture]]		[[Category:File architecture]]

Rob at 04:01, 25 April 2013

2013-04-25T04:01:34Z

← Older revision		Revision as of 04:01, 25 April 2013
Line 23:		Line 23:
	Note 1: FCT = 0, Table A = 1, Table B = 2, Table C = 3, Table D = 4, Table E = 5 and Table X = 6. Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.		Note 1: FCT = 0, Table A = 1, Table B = 2, Table C = 3, Table D = 4, Table E = 5 and Table X = 6. Because of INCREASE and DECREASE commands after the initial CREATE, the pages for a table may not be contiguous.

	~~[[Category:File architecture and management]]~~
	[[Category:File architecture]]		[[Category:File architecture]]