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Topic: Undo

	Undo - Wikipedia, the free encyclopedia
		Undo is a command in most word processors and text editors.
		Undo is used in many programs and is a helpful feature.
		Undo models can be categorized according to two criteria: linear vs non-linear, and single-user vs multi-user.
	en.wikipedia.org /wiki/Undo (310 words)

	Undo for Operators: Building an Undoable E-mail Store
		The essence of Three-R's Undo, and the property that distinguishes it from more traditional approaches like backup/restore, is that it preserves the system timeline: it restores lost updates and incoming data on replay in a manner that retains their intent and not the (possibly incorrect) results of their original processing.
		Since Three-R's undo is targeted at reducing human operator stress and improving overall system dependability, a true evaluation of Undo would require a dependability benchmark incorporating human subjects as described in [2]; such a study is beyond the scope of this paper, although we are in the process of performing one as future work.
		While the overhead imposed by Undo is not negligible, ranging from 62ms for a null SMTP session to 484ms for the median IMAP session, it is still relatively small compared to the threshold at which human users begin to perceive unacceptable sluggishness, typically pegged at about one second [16].
	roc.cs.berkeley.edu /papers/brown-emailundo-usenix03/brown-emailundo.html (9889 words)

	Info Node: (emacs)Undo (Site not responding. Last check: 2007-11-02)
		To undo further changes in the same region, repeat the `undo' command (no prefix argument is needed).
		Whenever an undo command makes the stars disappear from the mode line, it means that the buffer contents are the same as they were when the file was last read in or saved.
		The reason the `undo' command has two keys, `C-x u' and `C-_', set up to run it is that it is worthy of a single-character key, but on some keyboards it is not obvious how to type `C-_'.
	www.cs.cmu.edu /cgi-bin/info2www?(emacs)Undo (713 words)

	blender3d.org :: Global Undo
		The amount of required undo memory always is at least the size of the current.blend file, plus an average of about 2-5% of that per undo step.
		Undo operations don't (re)store the UI or view settings - as typically is being saved in Blender files - this means that after making changes in the UI, not all undo/redo steps can be obviously visible in all circumstances.
		Typically an undo system is based on principles where all changes in the data are being tracked by for example 'history lists' (like script lines), or by wrapping all data-changes with separate functions that can construct an event list for what has changed.
	www.blender3d.org /cms/Global_undo.398.0.html (1184 words)

	Undo me! - Salon (Site not responding. Last check: 2007-11-02)
		The need for a better undo is one of the important ideas in designer Jef Raskin's first book, "The Humane Interface," published earlier this year by Addison-Wesley.
		Undo works for undoing modification to text in the memo pad application, for example, but it can't undo the deletion of a memo.
		An undo feature that would undo a change to the last transaction would have saved him much work and frustration.
	dir.salon.com /tech/col/2000/06/01/undo (1091 words)

	Undo - GNU Emacs Manual (Site not responding. Last check: 2007-11-02)
		You can undo all the recent changes in the buffer text, up to a certain point.
		Ordinary undo applies to all changes made in the current buffer.
		When the undo information for a buffer becomes too large, Emacs discards the oldest undo information from time to time (during garbage collection).
	www.gnu.org /software/emacs/manual/html_node/Undo.html (703 words)

	Undo System for System Operators and Administrators
		One of the key tenets of the Recovery-Oriented Computing (ROC) philosophy is that systems should provide undo functionality for their operators and administrators, to allow those operators and administrators to recover from human errors that they make, as well as to recover from failed operations like software upgrades, installs, and configuration updates.
		The research prototype consists of a generic undo manager that coordinates the undo process and that provides a framework for expressing application-specific policy with regard to externally-visible consistency across undo cycles.
		The consistency policies are the key to the undo system's operation, as they provide the application-specific knowledge needed to reconcile end-user transparency and recovery power.
	roc.cs.berkeley.edu /projects/undo (461 words)

	AskTom "UNDO RETENTION"
		The undo retention time was increased to 3600, the oracle must use/generate more rbs to accomadate it since there are enough space available in the undotbs1 tablespace in autoextend mode.
		And ensure that sufficient undo space has been allocated (monitor v$undostat to see if you are prematurely expiring undo extents due to lack of space) You use checkpointing to reduce recovery times in the event of a system failure, but they have nothing to do with 1555's at all.
		Also, it (for the first time) flags the occurrences of ora-1555 (meaning your undo retention is too small or the amount of disk youve supplied is too small) allowing you the dba to detect this issue without and end user letting you know about it first.
	asktom.oracle.com /pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:7705505116425 (10922 words)

	Undo: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-11-02)
		Undo is a command in most word processors Word processor quick summary:
		A word processor (also more formally known as a document preparation system) is a computer application used for the production (including composition, editing,...
		(undo will negate the last command done to the file being edited.
	www.absoluteastronomy.com /encyclopedia/u/un/undo.htm (158 words)

	Undo Management
		You can use the undo manager to support undoing any command, regardless of whether the user issues the command through a menu or through other interface methods (for example, pushbuttons).
		You add the undo manager to a menu just as you would any other menu item: using the VkMenu::add() function of the menu object to which you want to add the undo manager.
		The undo manager passes the clientData argument to the undo callback function as client data when it invokes the callback.
	www.ics.com /support/docs/viewkit/1.3/pguide/ch06und1.htm (1563 words)

	Encyclopedia of Fruit and Vegetables
		It is even more silly to heed the voice of ignorance when told that properly made fresh raw juices cause sickness when as a matter of fact the temporary discomfort is usually nothing more than the process of bodily "house cleaning" in a perfectly natural manner as a result of these juices.
		We must cooperate with Nature to undo the harm that we did to ourselves, and furnish our systems regularly, daily, with the organic elements in sufficient quantities with which to rebuild the cells and tissues of the body.
		It takes time to do this and it is my experience that the quickest and most positive way to do it is to determine just how many pints of juices we can drink daily and strive to drink these days without failure or exception for months or years.
	www.allorganic.net /encyclopedia.html (5468 words)

	Undo in AspectJ (Site not responding. Last check: 2007-11-02)
		Anyone that has written a large GUI application knows that undo is a major pain in the ass, each command has to written twice, how to do it and how to undo it.
		The rest of the solution is basically just plumbing, to undo a command all modifications are undoed in sequence.
		Undo of a single modification is basically just about restoring the old value of the field using reflection:
	jutopia.tirsen.com /articles/2004/04/25/undo-in-aspectj (952 words)

	Mesh Edit Undo (Site not responding. Last check: 2007-11-02)
		While the stoic nature of working with out an undo key has been claimed as a great character builder for Blender users, we have to admit that we all make mistakes.
		Undo operations are only stored for one mesh at a time.
		You can leave and re-enter editmode for the same mesh without losing any undo information, but once another mesh is edited, the undo information for the first is gone.
	www.blender.org /docs/2.30_release/UndoDoc/UndoDoc.html (268 words)

	www.myspace.com/undoband (Site not responding. Last check: 2007-11-02)
		undo's unique blend of various influences brings to mind acts such as nine inch nails, kmfdm, massive attack, and peter gabriel.
		the mind and voice behind undo is joel day, a multi-talented young artist in seattle with a strong background in music, design, and technology.
		taking responsibility for all creative aspects of undo, everything from the music to the website and visual design is the direct product of joel's imagination and execution.
	profile.myspace.com /index.cfm?fuseaction=user.viewprofile&friendID=2702060&Mytoken=1047F44B-92EF-6C42-4D0114AD1525AF069663709 (174 words)

	Talking Tuning: Tuning Undo Tablespace (Site not responding. Last check: 2007-11-02)
		Any executing transaction can consume free space in the undo tablespace, and when the transaction completes, its undo space is freed (depending on how it's been sized and a few other factors, as we'll see in a minute).
		As shown in Figure 1, the Undo Management page shows key statistics for the active undo tablespace for the instance—the longest-running query, average kilobytes per minute of undo generated by the system, and the maximum number of kilobytes per minute of undo generated by the system during the selected time period.
		Although the Undo Management page shows you at a glance many of the variables of the existing undo tablespace; its configuration; and how effective that configuration is, given the runtime statistics collected in the AWR, you'll turn to the Undo Advisor when you want to extrapolate how future requirements might affect the undo tablespace size.
	www.oracle.com /technology/oramag/oracle/05-jul/o45tuning.html (1698 words)

	Dylan Greene dot com - Undo Ideas
		Undo Support for User Interface Modifications: How many times have you accidental rearranged a program's layout by dragging a menu bar or icon bar only to find what happened by accident is a total pain to fix.
		UI Undo is a great idea for that occasion where a toolbar drops into the "great abyss" at the bottom of the screen, or hides with an unrecognizable corner peaking out from behind another toolbar or such.
		Dylan, it seem the "great Undo God in the sky" is not only listening to your requests but predicts them in advance and fulfills them...
	www.dylangreene.com /blog.asp?blogID=408 (893 words)

	Undo/Redo (Site not responding. Last check: 2007-11-02)
		The developer restores the database to the state it was in before the last undo was called on the restore object.
		The undo system also allows values to be held in a buffer and then restored programmatically.
		An example of when to do this is when a creation object is deleted after some undo items have been put on the stack that refer to that object, for instance when a plug-in is doing a custom creation process.
	sparks.discreet.com /knowledgebase/webhelp/html/idx_AT_undo_redo.htm (1245 words)

	Technorati Tag: undo
		Undo at Amazon.com Shop at Amazon.com for low prices on Undo.
		Undo Tools 95/98/NT/2000/XP/CD-RW Data recovering tools and services is our focus.
		Undo hilft den Rockstars vom Tokioter Hotel und aendert den Refrain ihres Krachers Durch den Monsun, um die subtile Botschaft des...
	www.technorati.com /tag/undo (363 words)

	Prograph Undo (Site not responding. Last check: 2007-11-02)
		This scheme works as long as there is enough memory and speed to undo and redo the operation (which is the whole point of implementing the command object.) Unfortunately, this is not always the case.
		The problem is that sometimes, implementing undo with the basic command object is inefficient, impractical, or actually impossible.
		In the standard window (with vanilla commands) undo for each of the undoable operations is provided with the standard undo mechanism, but in the filtering window, undo for all three of the commands is provided for with filters and sieves.
	www.mactech.com /articles/mactech/Vol.11/11.03/PrographUndo (3436 words)

	What is undo? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-11-02)
		To return to a previous state by undoing the effects of one or more commands.
		The undo command is a valuable feature supported by many software products.
		Each time you press the undo key, the previous command is undone.
	www.webopedia.com /TERM/U/undo.html (197 words)

	UndoManager (Java 2 Platform SE 5.0)
		Empty the undo manager, sending each edit a die message in the process.
		Return the appropriate name for a command that toggles between undo and redo.
		If edits need to be discarded to shrink the limit, they will be told to die in the reverse of the order that they were added.
	java.sun.com /j2se/1.5/docs/api/javax/swing/undo/UndoManager.html (852 words)

	Add an undo/redo function to your Java apps with Swing
		Undo allows users to correct their mistakes and also to try out different aspects of the application without risk of repercussions.
		Not only should a command be able to invoke an operation on its target, but it should also be able to undo or redo that operation when prompted.
		When the user selects undo, we perform the undo operation of the current item in the list and then step backwards to the previous item.
	www.javaworld.com /javaworld/jw-06-1998/jw-06-undoredo.html (1716 words)

	Commands and Undo CPX (Site not responding. Last check: 2007-11-02)
		It stores enough information to be able to perform the action, to be able to undo the action, and to be able to redo the action, and the methods of that command object perform exactly these functions.
		Undo worked correctly as long as the user didn’t perform any action between the execution of the undoable command and the undo request.
		The only reason that we could think of for this was that CPX programmers were not putting undo support into their applications.
	www.mactech.com /articles/mactech/Vol.11/11.01/CommandsandUndoCPX (2812 words)

	Yonk (REALbasic) Source Code
		The Undo Toolkit includes window classes that automatically prompt the user to save changes (using a MacOS X sheet window), manage the MacOS X Aqua change flag, enable and handle the FileSave, EditUndo and EditRedo menu items, and support unlimited levels of undo with unlimited numbers of controls.
		Undo Toolkit supports application-wide or window-specific undo—you can choose the undo solution that's right for your project—and provides customizable language constants for multi-lingual apps.
		A fully implemented Undo system, which the developer can configure to support single or multi-level Undo (and Redo), on a per-document or application-wide basis, according to the needs of the application.
	www.ravenna.com /~forbes/yonk/source (1372 words)

	DBAsupport.com : Oracle 9i Central : Undo Tablespaces in Oracle 9i
		These records are used to Rollback transactions when a rollback statement is issued or during recovery of a database or to provide a read consistent view of data.
		Starting with Oracle 9i, DBA's are provided with some a new feature referred to as "Undo Tablespace" which allows the dba to exert more control on how long Undo information is retained and also eliminates the complexity of managing Rollback Segments in certain environments.
		Undo tablespaces use syntax that is similar to regular tablespaces except that they use the keyword UNDO.
	www.dbasupport.com /oracle/ora9i/undo.shtml (645 words)

	DBAzine.com - 10G Undo Advisor (Site not responding. Last check: 2007-11-02)
		The trick is to balance the size of the undo tablespace with the amount of undo retention you need to satisfy your long-running queries.
		The Undo Advisor Page displays a graph that allows you to determine the size of the undo tablespace that will be required to successfully store the amount of before images generated for a specified undo retention time period.
		It seems that the Undo Advisor uses a worst-case scenario to determine the amount of undo generated for a particular time period.
	www.dbazine.com /blogs/blog-cf/chrisfoot/blogentry.2005-10-22.6045254612 (1387 words)

	Optimize Oracle UNDO Parameters
		Traditionally transaction undo information was stored in Rollback Segments until a commit or rollback statement was issued, at which point it was made available for overlaying.
		Best of all, automatic undo management allows the DBA to specify how long undo information should be retained after commit, preventing "snapshot too old" errors on long running queries.
		The default is 900 seconds (5 minutes), and you can set this parameter to guarantee that Oracle keeps undo logs for extended periods of time.
	www.akadia.com /services/ora_optimize_undo.html (416 words)

	Undo Delete
		Undo Delete is data recovery software designed to restore files accidentally deleted from your system or secondary storage devices.
		This great tool allows you to retrieve files that were lost by deleting partitions, formatting disks, and just because you emptied the recycle bin.
		Undo Delete helps you browse the content of your disk like you do it in Windows Explorer.
	www.undodelete.com (102 words)

	HOW TO: Use the Undo Feature with Inserted Objects in Office XP Programs
		This list is called the "undo stack." Usually, the undo stack is cleared only when you perform an irreversible action, such as when you close a file.
		However, when you insert an object into another program, the undo stack may be cleared when you deactivate and reactive the object.
		You cannot undo changes that you previously made to the Excel worksheet or chart object.
	support.microsoft.com /?kbid=290148 (623 words)

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