DUMPTMAX parameter - Revision history

JAL at 19:14, 12 August 2014

2014-08-12T19:14:21Z

← Older revision		Revision as of 19:14, 12 August 2014
Line 9:		Line 9:
	<dd>System manager resettable		<dd>System manager resettable
	<dt>Related products		<dt>Related products
	<dd>[[Fast/Backup]]		<dd>[http://m204wiki.rocketsoftware.com/images/1/12/FastbackNew.pdf Fast/Backup]
	<dt>Introduced		<dt>Introduced
	<dd>Before <var class="product">Sirius Mods</var> 6.7		<dd>Before <var class="product">Sirius Mods</var> 6.7
	</dl>		</dl>

	==Description==		==Description==
	This parameter sets the maximum number of CCATEMP		This parameter sets the maximum number of CCATEMP
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	and the thread needs to update a page that has not been dumped yet,		and the thread needs to update a page that has not been dumped yet,
	that page needs to be dumped before the page can be updated.		that page needs to be dumped before the page can be updated.
	Normally, ''Fast/Backup'' will dump such a page almost immediately, and		Normally, Fast/Backup will dump such a page almost immediately, and
	there will be no noticeable delay for the updating transaction.		there will be no noticeable delay for the updating transaction.
	However, if ''Fast/Backup'' is waiting for a tape volume switch, perhaps waiting		However, if Fast/Backup is waiting for a tape volume switch, perhaps waiting
	for a tape mount, an updating transaction in this scenario would		for a tape mount, an updating transaction in this scenario would
	also have to wait for the tape mount.		also have to wait for the tape mount.
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	are timed out.		are timed out.

	In such a situation, ''Fast/Backup'' will try to copy the page to be updated to CCATEMP,		In such a situation, Fast/Backup will try to copy the page to be updated to CCATEMP,
	allowing the updating thread to continue with its update.		allowing the updating thread to continue with its update.
	After the tape mount is satisfied, the page is copied from CCATEMP, and the		After the tape mount is satisfied, the page is copied from CCATEMP, and the
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	CCATEMP being used, leaving insufficient CCATEMP for other applications.		CCATEMP being used, leaving insufficient CCATEMP for other applications.

	The DUMPTMAX parameter indicates the maximum number of CCATEMP pages that an		The <var>DUMPTMAX</var> parameter indicates the maximum number of CCATEMP pages that an
	individual DUMP will be allowed to use to cache pages that are		individual DUMP will be allowed to use to cache pages that are
	about to be updated.		about to be updated.
	If this number of pages is exceeded in the scenario described above, the		If this number of pages is exceeded in the scenario described above, the
	updating thread will have to wait for the tape mount, or the dump		updating thread will have to wait for the tape mount, or the dump
	will be terminated with an error, depending on the setting of the [[DUMPOPTS parameter]].		will be terminated with an error, depending on the setting of the <var>[[DUMPOPTS parameter\|DUMPOPTS]]</var> parameter.

			The default value for <var>DUMPTMAX</var> of 0 means that no limit is placed on
			the use of CCATEMP pages by Fast/Backup.

	~~The default value for DUMPTMAX of 0 means that no limit is placed on~~		See also <var>[[DUMPTMIN parameter\|DUMPTMIN]]</var>.
	~~the use of CCATEMP pages by ''Fast~~/~~Backup''~~.

	~~See also [[DUMPTMIN parameter\|DUMPTMIN]].~~
	[[Category:System parameters]]		[[Category:System parameters]]
	[[Category:Parameters]]		[[Category:Parameters]]

DmeWiccan: Automatically generated page update

2013-08-27T16:26:02Z

Automatically generated page update

← Older revision		Revision as of 16:26, 27 August 2013
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			{{Template:DUMPTMAX parameter subtitle}}
	==Summary==		==Summary==
	<dl>		<dl>

DmeWiccan: 1 revision

2012-06-22T19:25:00Z

1 revision

New page

==Summary==
<dl>
<dt>Default value
<dd>0
<dt>Parameter type
<dd>System
<dt>Where set
<dd>System manager resettable
<dt>Related products
<dd>[[Fast/Backup]]
<dt>Introduced
<dd>Before <var class="product">Sirius Mods</var> 6.7
</dl>
==Description==
This parameter sets the maximum number of CCATEMP
pages any individual DUMP can use.

If a thread is performing an update on a file that is being dumped,
and the thread needs to update a page that has not been dumped yet,
that page needs to be dumped before the page can be updated.
Normally, ''Fast/Backup'' will dump such a page almost immediately, and
there will be no noticeable delay for the updating transaction.
However, if ''Fast/Backup'' is waiting for a tape volume switch, perhaps waiting
for a tape mount, an updating transaction in this scenario would
also have to wait for the tape mount.
The result is not good for the updating request and potentially not good
for other users in the Online, as resources held by the updating user are
not released and, if sub-transaction checkpoints are being used, checkpoints
are timed out.

In such a situation, ''Fast/Backup'' will try to copy the page to be updated to CCATEMP,
allowing the updating thread to continue with its update.
After the tape mount is satisfied, the page is copied from CCATEMP, and the
CCATEMP used by the cached page is freed.
Obviously, if there is a lot of updating for a file being dumped, and the dump
ends up waiting on a tape mount, this could result in a '''lot''' of
CCATEMP being used, leaving insufficient CCATEMP for other applications.

The DUMPTMAX parameter indicates the maximum number of CCATEMP pages that an
individual DUMP will be allowed to use to cache pages that are
about to be updated.
If this number of pages is exceeded in the scenario described above, the
updating thread will have to wait for the tape mount, or the dump
will be terminated with an error, depending on the setting of the [[DUMPOPTS parameter]].

The default value for DUMPTMAX of 0 means that no limit is placed on
the use of CCATEMP pages by ''Fast/Backup''.

See also [[DUMPTMIN parameter|DUMPTMIN]].
[[Category:System parameters]]
[[Category:Parameters]]

JAL at 01:05, 1 October 2010

2010-10-01T01:05:04Z

New page

<dl>
<dt>Default value
<dd>0
<dt>Parameter type
<dd>System
<dt>Where set
<dd>System manager resettable
<dt>Related products
<dd>[[Fast/Backup]]
<dt>Introduced
<dd>Before [[Sirius Mods]] 6.7
</dl>

This parameter sets the maximum number of CCATEMP
pages any individual DUMP can use.

If a thread is performing an update on a file that is being dumped,
and the thread needs to update a page that has not been dumped yet,
that page needs to be dumped before the page can be updated.
Normally, ''Fast/Backup'' will dump such a page almost immediately, and
there will be no noticeable delay for the updating transaction.
However, if ''Fast/Backup'' is waiting for a tape volume switch, perhaps waiting
for a tape mount, an updating transaction in this scenario would
also have to wait for the tape mount.
The result is not good for the updating request and potentially not good
for other users in the Online, as resources held by the updating user are
not released and, if sub-transaction checkpoints are being used, checkpoints
are timed out.

In such a situation, ''Fast/Backup'' will try to copy the page to be updated to CCATEMP,
allowing the updating thread to continue with its update.
After the tape mount is satisfied, the page is copied from CCATEMP, and the
CCATEMP used by the cached page is freed.
Obviously, if there is a lot of updating for a file being dumped, and the dump
ends up waiting on a tape mount, this could result in a '''lot''' of
CCATEMP being used, leaving insufficient CCATEMP for other applications.

The DUMPTMAX parameter indicates the maximum number of CCATEMP pages that an
individual DUMP will be allowed to use to cache pages that are
about to be updated.
If this number of pages is exceeded in the scenario described above, the
updating thread will have to wait for the tape mount, or the dump
will be terminated with an error, depending on the setting of the [[DUMPOPTS parameter]].

The default value for DUMPTMAX of 0 means that no limit is placed on
the use of CCATEMP pages by ''Fast/Backup''.

See also [[DUMPTMIN parameter|DUMPTMIN]].
[[Category:System Parameters]]
[[Category:Parameters]]