caching

问题 I have a strange issue, which I haven't experienced before. I use Entity Framework to retrieve my records. I have the following call: var dbOrganisation = repository.DbOrganisation.FirstOrDefault(c => c.Id == id); I expect no caching of this call. So when I make this call, I expect it to query the database and retrieve the latest DbOrganisation object. But that is not what happens. I call this method relatively two times relatively short time after eachother (~5-10 seconds). But in this

问题 As stated in the documentation on sqlite_popen php tries to make use of a persistent resource mechanism. Where is this mechanism described in detail? Is it possible to view all resources currently stored/used? Is it possible to access this mechanism and store/read other values? 回答1: sqlite_popen uses the (executor) global hashtable "persistent_list" to store the connection resource. This hashtable is not part of the php "instance" which executes your script but of the php "runtime", which

问题 I'm working on my project using ReactJS and I use create-react-app to create my app. After building project, I use my server to serve the build folder. And when I update my app, the browser of user still uses the old version of my app because it caches the static files (js, css). So is there any way to prevent browser from caching static files ? Thank you ! 回答1: TLDR: You will want to send caching instructions via HTTP headers. The Cache-Control header has several directives to control cache

问题 Suppose I have the following: public class MyElement { } [Serializable] [StructLayout(LayoutKind.Sequential)] struct ArrayElement { internal MyElement Element; } public class MyClass { internal MyElement ComputeElement(int index) { // This method does a lengthy computation. // The actual return value is not so simple. return new MyElement(); } internal MyElement GetChild(ref MyElement element, int index) { if (element != null) { return element; } var elem = ComputeElement(index); if

问题 I am generating the images and want browser to cache them forever, but instead browser never cache them at all. This is my php code header('Content-type:'.$file->content_type); header('Expires: Thu, 15 Apr '.(date('Y')+10).' 20:00:00 GMT'); header('Content-Disposition: attachment; filename="'.$file->file_name.'"'); echo(file_get_contents($model_files->files_path.$file->md5.$model_files->seprator.$file->file_name)); and these are the response headers which i keep getting in browser. Date: Thu,

问题 I need to enable caching in my asp.net application, but I do not want to use the webserver's memory for holding cache objects. If I add the page directive for output caching will the page be stored in the asp.net cache object? Thanks! 回答1: The default behaviour is to store the content in memory in the same way as HttpRuntime.Cache (actually in an internal HttpRuntime.CacheInternal which behaves similarly to the publicly visible cache), but in ASP.NET 4.0 you can write your own provider to

问题 How to clear file system cache (e.g. directory cache and inode cache) on a Mac OSX? I would like to do some performance analysis on a cold MacOSX machine. I am wondering that is there any approach like echo 3 > /proc/sys/vm/drop_caches on a Linux box? 回答1: is purge(8) any use to you? Purge can be used to approximate initial boot conditions with a cold disk buffer cache for performance analysis. It does not affect anonymous memory that has been allocated through malloc, vm_allocate, etc. 来源：

问题 How to clear file system cache (e.g. directory cache and inode cache) on a Mac OSX? I would like to do some performance analysis on a cold MacOSX machine. I am wondering that is there any approach like echo 3 > /proc/sys/vm/drop_caches on a Linux box? 回答1: is purge(8) any use to you? Purge can be used to approximate initial boot conditions with a cold disk buffer cache for performance analysis. It does not affect anonymous memory that has been allocated through malloc, vm_allocate, etc. 来源：

问题 I have been trying to us the app fabric caching on a win2008 standard server. When I execute the follwowing command I get: Import-Module DistributedCacheAdministration Import-Module : The specified module 'DistributedCacheAdministration' was not loaded because no valid module file was found in any module directory. Where is this directory located and how can I use that module Also, it appears that I have powershell 1. I cant seem to install powershell 2 回答1: Modules and their commands is a

问题 I've got a Guava Cache (or rather, I am migrating from MapMaker to Cache ) and the values represent long-running jobs. I'd like to add expireAfterAccess behavior to the cache, as it's the best way to clean it up; however, the job may still be running even though it hasn't been accessed via the cache in some time, and in that case I need to prevent it from being removed from the cache. I have three questions: Is it safe to reinsert the cache entry that's being removed during the