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  • Automatic Maintenance Jobs in every PDB? New SPM Evolve Advisor Task in Oracle 12.1.0.2

    - by Mike Dietrich
    A customer checking out our slides from the OTN Tour in August 2014 asked me a finicky question the other day: "According to the documentation the Automatic SQL Tuning Advisor maintenance task gets executed only within the CDB$ROOT, but not within each PDB - but the slides are not clear here. So what is the truth?" Ok, that's good question. In my understanding all tasks will get executed within each PDB - that's why we recommend (based on experience) to break up the default maintenance windows when using Oracle Multitenant. Otherwise all PDBs will have the same maintenance windows, and guess what will happen when 25 PDBs start gathering object statistics at the same time ... The documentation indeed says: Automatic SQL Tuning Advisor data is stored in the root. It might have results about SQL statements executed in a PDB that were analyzed by the advisor, but these results are not included if the PDB is unplugged. A common user whose current container is the root can run SQL Tuning Advisor manually for SQL statements from any PDB. When a statement is tuned, it is tuned in any container that runs the statement. This sounds reasonable. But when we have a look into our PDBs or into the CDB_AUTOTASK_CLIENT view the result is different from what the doc says. In my environment I did create just two fresh empty PDBs (CON_ID 3 and 4): SQL> select client_name, status, con_id from cdb_autotask_client; CLIENT_NAME                           STATUS         CON_ID------------------------------------- ---------- ----------auto optimizer stats collection       ENABLED             1sql tuning advisor                    ENABLED             1auto space advisor                    ENABLED             1auto optimizer stats collection       ENABLED             4sql tuning advisor                    ENABLED             4auto space advisor                    ENABLED             4auto optimizer stats collection       ENABLED             3sql tuning advisor                    ENABLED             3auto space advisor                    ENABLED             3 9 rows selected. I haven't verified the reason why this is different from the docs but it may have been related to one change in Oracle Database 12.1.0.2: The new SPM Evolve Advisor Task ( SYS_AUTO_SPM_EVOLVE_TASK) for automatic plan evolution for SQL Plan Management. This new task doesn't appear as a stand-alone job (client) in the maintenance window but runs as a sub-entity of the Automatic SQL Tuning Advisor task. And (I'm just guessing) this may be one of the reasons why every PDB will have to have its own Automatic SQL Tuning Advisor task  Here you'll find more information about how to enable, disable and configure the new Oracle 12.1.0.2 SPM Evolve Advisor Task: Oracle Database 12.1.0.2 SQL Tuning Guide:Managing the SPM Evolve Advisor Task -Mike

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  • How Can I prevent a specific application from being run on a specific machine using Group Policy?

    - by Mike
    I know this is possible to do and I am working on it with limited success. I believe the Group Policy I want is "Do Not Run Specified Windows Applications" - I can enable this and add the .exe I want to the list of programs not to be run. I have tried this on my local machine by running gpedit.msc going to User Config Admin Templates System and then choosing that policy and editing and enabling it. Doing it this way verifies that it works as I could then not run the specified .exe (XenAppWeb.exe) So this is great. I have created a GPO to do the same thing in GP Management on my domain controller where we centralize this, enforced it, applied it to an OU, and put one of our machines into this OU to test it. I have let it sit there for 3 days, run gpupdate /force, and when I try to run XenAppWeb.exe on this machine, it still lets me run it fine. What can I look at to troubleshoot this? I should note that I am trying to enact this policy on Windows XP machines (Virtual Machines) Thanks, Mike

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  • MVVM: How to handle interaction between nested ViewModels?

    - by Dan Bryant
    I'm been experimenting with the oft-mentioned MVVM pattern and I've been having a hard time defining clear boundaries in some cases. In my application, I have a dialog that allows me to create a Connection to a Controller. There is a ViewModel class for the dialog, which is simple enough. However, the dialog also hosts an additional control (chosen by a ContentTemplateSelector), which varies depending on the particular type of Controller that's being connected. This control has its own ViewModel. The issue I'm encountering is that, when I close the dialog by pressing OK, I need to actually create the requested connection, which requires information captured in the inner Controller-specific ViewModel class. It's tempting to simply have all of the Controller-specific ViewModel classes implement a common interface that constructs the connection, but should the inner ViewModel really be in charge of this construction? My general question is: are there are any generally-accepted design patterns for how ViewModels should interact with eachother, particularly when a 'parent' VM needs help from a 'child' VM in order to know what to do?

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  • Filtering in a HierarchicalDataTemplate via MarkupExtension?

    - by Dan Bryant
    I'm trying to create a MarkupExtension to allow filtering of items in an ItemsSource of a HierarchicalDataTemplate. In particular, I'd like to be able to supply a method name that will be executed on the DataContext in order to perform the filtering. The usage syntax I'm after looks like this: <HierarchicalDataTemplate DataType="{x:Type src:DeviceBindingViewModel}" ItemsSource="{Utilities:FilterCollection {Binding Definition.Entries}, MethodName=FilterEntries}"> <StackPanel Orientation="Horizontal"> <Image Source="{StaticResource BindingImage}" Width="24" Height="24" Margin="3"/> <TextBlock Text="{Binding DisplayName}" FontSize="12" VerticalAlignment="Center"/> </StackPanel> </HierarchicalDataTemplate> My code for the custom MarkupExtension looks like this: public sealed class FilterCollectionExtension : MarkupExtension { private readonly MultiBinding _binding; private Predicate<Object> _filterMethod; public string MethodName { get; set; } public FilterCollectionExtension(Binding binding) { _binding = new MultiBinding(); _binding.Bindings.Add(binding); //We package a reference to the DataContext with the binding so that the Converter has access to it var selfBinding = new Binding {RelativeSource = RelativeSource.Self}; _binding.Bindings.Add(selfBinding); _binding.Converter = new InternalConverter(this); } public FilterCollectionExtension(Binding binding, string methodName) : this(binding) { MethodName = methodName; } public override object ProvideValue(IServiceProvider serviceProvider) { return _binding; } private bool FilterInternal(Object dataContext, Object value) { //Filtering is only applicable if a DataContext is defined if (dataContext != null) { if (_filterMethod == null) { var type = dataContext.GetType(); var method = type.GetMethod(MethodName, new[] { typeof(Object) }); if (method == null || method.ReturnType != typeof(bool)) throw new InvalidOperationException("Could not locate a filter predicate named " + MethodName + " on the DataContext"); _filterMethod = (Predicate<Object>)Delegate.CreateDelegate(typeof(Predicate<Object>), dataContext, method); } else { if (_filterMethod.Target != dataContext) { _filterMethod = (Predicate<Object>) Delegate.CreateDelegate(typeof (Predicate<Object>), dataContext, _filterMethod.Method); } } if (_filterMethod != null) return _filterMethod(value); } //If no filtering resolved, just allow all elements return true; } private class InternalConverter : IMultiValueConverter { private readonly FilterCollectionExtension _owner; public InternalConverter(FilterCollectionExtension owner) { _owner = owner; } public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { var enumerable = values[0]; var targetElement = (FrameworkElement)values[1]; var view = CollectionViewSource.GetDefaultView(enumerable); view.Filter = item => _owner.FilterInternal(targetElement.DataContext, item); return view; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new NotSupportedException("Cannot convert back"); } } } I can see that the extension is instantiated and I can see it return the MultiBinding that is used by the Template. I also see the call to the InternalConverter.Convert method, which sees the expected parameters (I see the collection provided by the nested {Binding}) and is successfully able to retrieve the ICollectionView for the incoming collection. The only problem is that FilterInternal never gets called. The template is ultimately being used by a TreeView, if that's relevant. I haven't been able to figure out why the FilterInternal method is not being called and I was hoping somebody might be able to offer some insight.

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  • Synchronized Enumerator in C#

    - by Dan Bryant
    I'm putting together a custom SynchronizedCollection<T> class so that I can have a synchronized Observable collection for my WPF application. The synchronization is provided via a ReaderWriterLockSlim, which, for the most part, has been easy to apply. The case I'm having trouble with is how to provide thread-safe enumeration of the collection. I've created a custom IEnumerator<T> nested class that looks like this: private class SynchronizedEnumerator : IEnumerator<T> { private SynchronizedCollection<T> _collection; private int _currentIndex; internal SynchronizedEnumerator(SynchronizedCollection<T> collection) { _collection = collection; _collection._lock.EnterReadLock(); _currentIndex = -1; } #region IEnumerator<T> Members public T Current { get; private set;} #endregion #region IDisposable Members public void Dispose() { var collection = _collection; if (collection != null) collection._lock.ExitReadLock(); _collection = null; } #endregion #region IEnumerator Members object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { var collection = _collection; if (collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex++; if (_currentIndex >= collection.Count) { Current = default(T); return false; } Current = collection[_currentIndex]; return true; } public void Reset() { if (_collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex = -1; Current = default(T); } #endregion } My concern, however, is that if the Enumerator is not Disposed, the lock will never be released. In most use cases, this is not a problem, as foreach should properly call Dispose. It could be a problem, however, if a consumer retrieves an explicit Enumerator instance. Is my only option to document the class with a caveat implementer reminding the consumer to call Dispose if using the Enumerator explicitly or is there a way to safely release the lock during finalization? I'm thinking not, since the finalizer doesn't even run on the same thread, but I was curious if there other ways to improve this.

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  • TwoWay Binding to ListBox SelectedItem on more than one list box in WPF

    - by Dan Bryant
    I have a scenario where I have a globally available Properties window (similar to the Properties window in Visual Studio), which is bound to a SelectedObject property of my model. I have a number of different ways to browse and select objects, so my first attempt was to bind them to SelectedObject directly. For example: <ListBox ItemsSource="{Binding ActiveProject.Controllers}" SelectedItem="{Binding SelectedObject, Mode=TwoWay}"/> <ListBox ItemsSource="{Binding ActiveProject.Machines}" SelectedItem="{Binding SelectedObject, Mode=TwoWay}"/> This works well when I have more than one item in each list, but it fails if a list has only one item. When I select the item, SelectedObject is not updated, since the list still thinks its original item was selected. I believe this happens because the two way binding simply ignores the update from source when SelectedObject is not an object in the list, leaving the list's SelectedItem unchanged. In this way, the bindings become out of sync. Does anybody know of a way to make sure the list boxes reset their SelectedItem when the SelectedObject is not in the list? Is there a better way to do this that doesn't suffer from this problem?

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  • SVN (Subversion) Problem "File is scheduled for addition, but is missing" - Using Versions

    - by Mike
    I'm using Versions for SVN. I attempt to commit and get this message: Commit failed (details follow): '/Users/mike/Sites/mysite.com/astss-cvsdude/Trunk/cart/flashfile.swf' is scheduled for addition, but is missing I suppose this is because I had added files to the repo, and then deleted them via the filesystem. I'd like to have it simply make note of my change, and apply the change to the repo. How can I get around this?

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  • Killing a deadlocked Task in .NET 4 TPL

    - by Dan Bryant
    I'd like to start using the Task Parallel Library, as this is the recommended framework going forward for performing asynchronous operations. One thing I haven't been able to find is any means of forcible Abort, such as what Thread.Abort provides. My particular concern is that I schedule tasks running code that I don't wish to completely trust. In particular, I can't be sure this untrusted code won't deadlock and therefore I can't be certain if a Task I schedule using this code will ever complete. I want to stay away from true AppDomain isolation (due to the overhead and complexity of marshaling), but I also don't want to leave a Task thread hanging around, deadlocked. Is there a way to do this in TPL?

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  • Repository - PHP

    - by Mike Silvis
    Hello, I am new to repositories and am currently looking around to find the best possible option. I need something that can handle multiple versions of our website, and allow multiple collaborators to all push to the repo together. Our current project is built in PHP, and we have a MySQL database. I am short on funding and need the best option for our money. I have limited ssh access to our server, however I have little to no experience working with repositories. Thanks, Mike

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  • Joomla - template dissapearing

    - by Mike Silvis
    Hello, I have a Joomla Website located at http://www.MikeSilvis.com, and upon going to the site initially everything looks fine. However if you go into the site and click any link say web-design You can see that the default template is no longer being displayed. I have tried changing to a different template but that does not seem to help. Any help would be greatly appreciated. Thanks, Mike

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  • Synchronized IEnumerator<T>

    - by Dan Bryant
    I'm putting together a custom SynchronizedCollection<T> class so that I can have a synchronized Observable collection for my WPF application. The synchronization is provided via a ReaderWriterLockSlim, which, for the most part, has been easy to apply. The case I'm having trouble with is how to provide thread-safe enumeration of the collection. I've created a custom IEnumerator<T> nested class that looks like this: private class SynchronizedEnumerator : IEnumerator<T> { private SynchronizedCollection<T> _collection; private int _currentIndex; internal SynchronizedEnumerator(SynchronizedCollection<T> collection) { _collection = collection; _collection._lock.EnterReadLock(); _currentIndex = -1; } #region IEnumerator<T> Members public T Current { get; private set;} #endregion #region IDisposable Members public void Dispose() { var collection = _collection; if (collection != null) collection._lock.ExitReadLock(); _collection = null; } #endregion #region IEnumerator Members object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { var collection = _collection; if (collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex++; if (_currentIndex >= collection.Count) { Current = default(T); return false; } Current = collection[_currentIndex]; return true; } public void Reset() { if (_collection == null) throw new ObjectDisposedException("SynchronizedEnumerator"); _currentIndex = -1; Current = default(T); } #endregion } My concern, however, is that if the Enumerator is not Disposed, the lock will never be released. In most use cases, this is not a problem, as foreach should properly call Dispose. It could be a problem, however, if a consumer retrieves an explicit Enumerator instance. Is my only option to document the class with a caveat implementer reminding the consumer to call Dispose if using the Enumerator explicitly or is there a way to safely release the lock during finalization? I'm thinking not, since the finalizer doesn't even run on the same thread, but I was curious if there other ways to improve this. EDIT After thinking about this a bit and reading the responses (particular thanks to Hans), I've decided this is definitely a bad idea. The biggest issue actually isn't forgetting to Dispose, but rather a leisurely consumer creating deadlock while enumerating. I now only read-lock long enough to get a copy and return the enumerator for the copy.

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  • Setting a PHP $_SESSION['var'] using jQuery

    - by mike condiff
    I need to set a PHP $_SESSION variable using the jQuery. IF the user clicks on an image I want to save a piece of information associated with that image as a session variable in php. I think I can do this by calling a php page or function and appending that piece of info to the query string. Any ideas. I have found little help through google. thanks mike

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  • Custom Modal Window in WPF?

    - by Dan Bryant
    I have a WPF application where I'd like to create a custom pop-up that has modal behavior. I've been able to hack up a solution using an equivalent to 'DoEvents', but is there a better way to do this? Here is what I have currently: private void ShowModalHost(FrameworkElement element) { //Create new modal host var host = new ModalHost(element); //Lock out UI with blur WindowSurface.Effect = new BlurEffect(); ModalSurface.IsHitTestVisible = true; //Display control in modal surface ModalSurface.Children.Add(host); //Block until ModalHost is done while (ModalSurface.IsHitTestVisible) { DoEvents(); } } private void DoEvents() { var frame = new DispatcherFrame(); Dispatcher.BeginInvoke(DispatcherPriority.Background, new DispatcherOperationCallback(ExitFrame), frame); Dispatcher.PushFrame(frame); } private object ExitFrame(object f) { ((DispatcherFrame)f).Continue = false; return null; } public void CloseModal() { //Remove any controls from the modal surface and make UI available again ModalSurface.Children.Clear(); ModalSurface.IsHitTestVisible = false; WindowSurface.Effect = null; } Where my ModalHost is a user control designed to host another element with animation and other support.

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  • PostSharp when using DataContractSerializer?

    - by Dan Bryant
    I have an Aspect that implements INotifyPropertyChanged on a class. The aspect includes the following: [OnLocationSetValueAdvice, MethodPointcut("SelectProperties")] public void OnPropertySet(LocationInterceptionArgs args) { var currentValue = args.GetCurrentValue(); bool alreadyEqual = (currentValue == args.Value); // Call the setter args.ProceedSetValue(); // Invoke method OnPropertyChanged (ours, the base one, or the overridden one). if (!alreadyEqual) OnPropertyChangedMethod.Invoke(args.Location.Name); } This works fine when I instantiate the class normally, but I run into problems when I deserialize the class using a DataContractSerializer. This bypasses the constructor, which I'm guessing interferes with the way that PostSharp sets itself up. This ends up causing a NullReferenceException in an intercepted property setter, but before it has called the custom OnPropertySet, so I'm guessing it interferes with setting up the LocationInterceptionArgs. Has anyone else encountered this problem? Is there a way I can work around it? I did some more research and discovered I can fix the issue by doing this: [OnDeserializing] private void OnDeserializing(StreamingContext context) { AspectUtilities.InitializeCurrentAspects(); } I thought, okay, that's not too bad, so I tried to do this in my Aspect: private IEnumerable<MethodInfo> SelectDeserializing(Type type) { return type.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public).Where( t => t.IsDefined(typeof (OnDeserializingAttribute), false)); } [OnMethodEntryAdvice, MethodPointcut("SelectDeserializing")] public void OnMethodEntry(MethodExecutionArgs args) { AspectUtilities.InitializeCurrentAspects(); } Unfortunately, even though it intercepts the method properly, it doesn't work. I'm thinking the call to InitializeCurrentAspects isn't getting transformed properly, since it's now inside the Aspect rather than directly inside the aspect-enhanced class. Is there a way I can cleanly automate this so that I don't have to worry about calling this on every class that I want to have the Aspect?

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  • Considerations when architecting an extensible application using MEF

    - by Dan Bryant
    I've begun experimenting with dependency injection (in particular, MEF) for one of my projects, which has a number of different extensibility points. I'm starting to get a feel for what I can do with MEF, but I'd like to hear from others who have more experience with the technology. A few specific cases: My main use case at the moment is exposing various singleton-like services that my extensions make use of. My Framework assembly exposes service interfaces and my Engine assembly contains concrete implementations. This works well, but I may not want to allow all of my extensions to have access to all of my services. Is there a good way within MEF to limit which particular imports I allow a newly instantiated extension to resolve? This particular application has extension objects that I repeatedly instantiate. I can import multiple types of Controllers and Machines, which are instantiated in different combinations for a Project. I couldn't find a good way to do this with MEF, so I'm doing my own type discovery and instantiation. Is there a good way to do this within MEF or other DI frameworks? I welcome input on any other things to watch out for or surprising capabilities you've discovered that have changed the way you architect.

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  • Populating PHP list() with values in an array.

    - by Mike
    Hi, I have an array: $arr = array('foo', 'bar', 'bash', 'monkey', 'badger'); I want to have the elements in that array appear as the variables in my list(): list($foo, $bar, $bash, $monkey, $badger) = $data; Without actually specifying the variables, I tried; list(implode(",$", $arr)) = $data; and list(extract($arr)) = $data; But they don't work, I get: Fatal error: Can't use function return value in write context Does anyone have any idea whether this is possible? Cheers, Mike

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  • MVVM: Thin ViewModels and Rich Models

    - by Dan Bryant
    I'm continuing to struggle with the MVVM pattern and, in attempting to create a practical design for a small/medium project, have run into a number of challenges. One of these challenges is figuring out how to get the benefits of decoupling with this pattern without creating a lot of repetitive, hard-to-maintain code. My current strategy has been to create 'rich' Model classes. They are fully aware that they will be consumed by an MVVM pattern and implement INotifyPropertyChanged, allow their collections to be observed and remain cognizant that they may always be under observation. My ViewModel classes tend to be thin, only exposing properties when data actually needs to be transformed, with the bulk of their code being RelayCommand handlers. Views happily bind to either ViewModels or Models directly, depending on whether any data transformation is required. I use AOP (via Postsharp) to ease the pain of INotifyPropertyChanged, making it easy to make all of my Model classes 'rich' in this way. Are there significant disadvantages to using this approach? Can I assume that the ViewModel and View are so tightly coupled that if I need new data transformation for the View, I can simply add it to the ViewModel as needed?

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  • Show Visual Studio's Source Control Merge Wizard programmatically

    - by Mike
    Hi, I'm developing a Work item Custom Control and I need to use the standard VS's Merge Wizard for items in source control from my code to allow to user choose the target branch, resolve conflicts etc. I'm pretty sure it's possible in some way (even through the reflection), but I just can't find the proper class in any of VS client assemblies (Microsoft.TeamFoundation.VersionControl.Controls.dll, Microsoft.TeamFoundation.VersionControl.Client.dll). Any help will be appreciated. Best regards, Mike

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  • Considerations when architecting an application using Dependency Injection

    - by Dan Bryant
    I've begun experimenting with dependency injection (in particular, MEF) for one of my projects, which has a number of different extensibility points. I'm starting to get a feel for what I can do with MEF, but I'd like to hear from others who have more experience with the technology. A few specific cases: My main use case at the moment is exposing various singleton-like services that my extensions make use of. My Framework assembly exposes service interfaces and my Engine assembly contains concrete implementations. This works well, but I may not want to allow all of my extensions to have access to all of my services. Is there a good way within MEF to limit which particular imports I allow a newly instantiated extension to resolve? This particular application has extension objects that I repeatedly instantiate. I can import multiple types of Controllers and Machines, which are instantiated in different combinations for a Project. I couldn't find a good way to do this with MEF, so I'm doing my own type discovery and instantiation. Is there a good way to do this within MEF or other DI frameworks? I welcome input on any other things to watch out for or surprising capabilities you've discovered that have changed the way you architect.

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  • Am I compiling with x64 JDK?

    - by Mike
    Hi, Do I have the 64 bit of JDK installed on my machine? My java -version says: C:\Documents and Settings\Administratorjava -version java version "1.6.0_20" Java(TM) SE Runtime Environment (build 1.6.0_20-b02) Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode) Should I expect a performance improvement in using a 64 bit compiler versus a 32 bit one? Thanks, Mike

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