File Control Table (File architecture) - Revision history

DCameron at 10:44, 16 July 2015

2015-07-16T10:44:49Z

← Older revision		Revision as of 10:44, 16 July 2015
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	<li>The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]]. </li>		<li>The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]]. </li>

			<li>The segment page array table. This contains a 3-byte pointer to the existence bit map for each segment of the file. From V7.5 onwards, if the FILEORG x'200' bit has been set during file creation to indicate that the file is a large file, then this table is moved to the second page of the FCT. </li>
	</ul>		</ul>

	<p>The remaining seven pages of the FCT are empty. They were used in very early versions of Model 204, but now they are "Reserved for Future Use."</p>		<p>The remaining seven pages ( or six pages if the FILEORG x'200' bit is set ) of the FCT are empty. They were used in very early versions of Model 204, but now they are "Reserved for Future Use."</p>

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

JAL: misc cleanup

2015-03-09T14:17:49Z

misc cleanup

← Older revision		Revision as of 14:17, 9 March 2015
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	<p>The File Control Table contains the file parameter settings, data set or file definition names of all data sets in the file, the status of the file, and other control information.</p>		<p>
			The File Control Table contains the file parameter settings, data set or file definition names of all data sets in the file, the status of the file, and other control information.</p>

	<p>The FCT is 8 pages.</p>		<p>The FCT is 8 pages.</p>
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	</ul>		</ul>

	<p>The remaining seven pages of the FCT are empty. They were used in very early versions of ~~M204~~, but are ~~now '~~Reserved for Future Use'.</p>		<p>The remaining seven pages of the FCT are empty. They were used in very early versions of Model 204, but now they are "Reserved for Future Use."</p>

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

Tbullock: Mention the majority 7/8ths of the FCT.

2015-03-06T19:22:02Z

Mention the majority 7/8ths of the FCT.

← Older revision		Revision as of 19:22, 6 March 2015
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	<li>The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]]. </li>		<li>The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]]. </li>
	</ul>		</ul>

			<p>The remaining seven pages of the FCT are empty. They were used in very early versions of M204, but are now 'Reserved for Future Use'.</p>

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

JAL at 01:42, 24 January 2014

2014-01-24T01:42:59Z

← Older revision		Revision as of 01:42, 24 January 2014
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	<p>The first page of the FCT is the File Parameter List (FPL) page, which contains:</p>		<p>The first page of the FCT is the File Parameter List (FPL) page, which contains:</p>
			<ul>
			<li>The File Parameter List holding the current parameter settings for the file </li>

	* The File Parameter List holding the current parameter settings for the file		<li>The Logical Page Map (LPM) which shows the distribution of the pages within the file </li>
	* The Logical Page Map (LPM) which shows the distribution of the pages within the file
	* The data sets list (DSL) comprising the name and number of pages in each data set
	* The shared DASD enqueue list, which:
	** controls access to the file by multiple jobs, potentially running on different processors that share the DASD device upon which the file data sets reside
	** contains the enqueue level of each of those jobs. The [[ENQCTL command]] enables you to display the enqueue list.
	* The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]].

			<li>The data sets list (DSL) comprising the name and number of pages in each data set </li>

			<li>The shared DASD enqueue list, which:
			<ul>
			<li>Controls access to the file by multiple jobs, potentially running on different processors that share the DASD device upon which the file data sets reside </li>

			<li>Contains the enqueue level of each of those jobs. The <var>[[ENQCTL command\|ENQCTL]]</var> command enables you to display the enqueue list. </li>
			</ul> </li>

			<li>The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]]. </li>
			</ul>

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

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

2013-12-18T22:04:11Z

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

← Older revision	Revision as of 22:04, 18 December 2013
(No difference)

ELowell at 19:34, 16 May 2013

2013-05-16T19:34:04Z

← Older revision		Revision as of 19:34, 16 May 2013
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	<p>The FCT is 8 pages.</p>		<p>The FCT is 8 pages.</p>

	<p>The first page of the FCT is the ~~The~~ File Parameter List (FPL) page, which contains :</p>		<p>The first page of the FCT is the File Parameter List (FPL) page, which contains:</p>

	* The File Parameter List holding the current parameter settings for the file		* The File Parameter List holding the current parameter settings for the file
	* The Logical Page Map (LPM) which shows the distribution of the pages within the file		* The Logical Page Map (LPM) which shows the distribution of the pages within the file
	* The ~~datasets~~ list (DSL) comprising the name and number of pages in each ~~dataset~~		* The data sets list (DSL) comprising the name and number of pages in each data set
	* The shared DASD enqueue list		* The shared DASD enqueue list, which:
	** controls access to the file by multiple jobs, potentially running on different processors that share the DASD device upon which the file ~~dataset(s)~~ reside		** controls access to the file by multiple jobs, potentially running on different processors that share the DASD device upon which the file data sets reside
	** contains the enqueue level of each of those jobs		** contains the enqueue level of each of those jobs. The [[ENQCTL command]] enables you to display the enqueue list.
	** see the [[ENQCTL command]] ~~to see how~~ to display ~~this~~		* The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|opened]].
	* The current file [[BROADCAST command: Sending a file message\|broadcast]] message (if any), displayed when the file is [[OPEN FILE command\|~~OPEN~~]]ed.

DCameron at 11:36, 16 May 2013

2013-05-16T11:36:44Z

← Older revision		Revision as of 11:36, 16 May 2013
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	* The datasets list (DSL) comprising the name and number of pages in each dataset		* The datasets list (DSL) comprising the name and number of pages in each dataset
	* The shared DASD enqueue list		* The shared DASD enqueue list
	** controls access to the file by multiple jobs		** controls access to the file by multiple jobs, potentially running on different processors that share the DASD device upon which the file dataset(s) reside
	** contains the enqueue level of each of those jobs		** contains the enqueue level of each of those jobs
	** see the [[ENQCTL command]] to see how to display this		** see the [[ENQCTL command]] to see how to display this

Rob at 04:01, 25 April 2013

2013-04-25T04:01:17Z

← Older revision		Revision as of 04:01, 25 April 2013
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	~~[[Category:File architecture and management]]~~
	[[Category:File architecture]]		[[Category:File architecture]]

DmeWiccan: Automatically generated page update

2013-04-19T13:04:31Z

Automatically generated page update

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

DmeWiccan: Automatically generated page update

2013-04-19T07:41:34Z

Automatically generated page update

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	[[Category:File ~~Architecture~~ and Management]]		[[Category:File architecture and Management]]
	[[Category:File ~~Architecture~~]]		[[Category:File architecture]]