storage

问题 In Linux, how to ensure my system write() calls (and similar write-IO calls/variants) reach non-volatile storage, bypassing memory/cache/buffered-IO? 回答1: See "Ensuring data reaches disk." In short, the safest policy is O_DIRECT + fsync() at appropriate points. 回答2: Using O_DIRECT would achieve the purpose but that can be inefficient for most applications, unless you are managing the whole file caching/buffering in your application. Typically there are two ways this is done. Use O_SYNC flag

问题 Where does Internet Explorer stores its form data history that is uses for auto completion? I need to make a tool the cleans IE form data. Is there an API for this? Or what are the registry keys? 回答1: Autocomplete data is stored in the registry in two places: HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms\Storage1 HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\IntelliForms\Storage2 Direct manipulation is not supported. Technically, the IE7+ API to do this is:

问题 Is it possible for an SQLite data file used by an add-on to be one of the files accessed with data.url()? If so, how does one hand it off to Services.storage.openDatabase() If not, is it possible for certain code (CREATE TABLE IF EXISTS...) to be executed only in a first-time run of an add-on? 回答1: Is it possible for an SQLite data file used by an add-on to be one of the files accessed with data.url()? No. As of Add-on SDK 1.5, extensions are no longer uncompressed upon installation - they

问题 What is the correct way to display a HTML file downloaded and saved in the file system? I am able to download and save the html page in the .cn1 folder on Simulator but it doesn't display. I tested using the Page.html sample file found in the old Kitchen Sink demo. Also, how can I use hardcoded paths like file:///storage/emulated/0/Folder/Page.html instead? I have tried but nothing appears in common folders in the phone e.g. the Android folder. Below is what I have done so far! `Form fm_brw =

问题 I'm trying to play with Google Web Toolkit (GWT 1.6) on Google AppEngine with Java (GAE/J) and I have encountered problem storing data files to GAE. So I have decided to use S3 to store my files but when I googled, I've found library called gwt-s3 that allows me to store File to S3 using GWT, but the problem is that it only allows storing files on S3 only if GWT app is hosted on/with S3. Here is what its saying on the front page: Due to same-origin security policy limitations, this module

问题 I am downloading data into my app from the internet. If I specify internal memory (=Environment.getExternalStorageDirectory()), I may have face problem of "not enough space". Sdcard mount address always differs phone to phone, so I would like to allow user to select his preferable location, where to store downloaded data. Is there any method, how to get all available storage options, whhich can be used? (generally, I would like to choose between internal memory or inserted sdcard). Thanks 回答1

问题 I'm using Django 1.3, and I'd like to modify the session middleware to add some methods that will help me out. In ./settings.py SESSION_ENGINE='tcore.my_sessions.MySessionStore' In ./tcore/my_sessions.py: from django.contrib.sessions.backends.db import SessionStore from django.contrib.sessions.middleware import SessionMiddleware from django.conf import settings class MySessionStore(SessionStore): .... def my custom methods here However, I keep getting some weird exceptions when I do this.

问题 This is very interesting topic, they use following formula to compute access interval time: BreakEvenIntervalinSeconds = (PagesPerMBofRAM / AccessesPerSecondPerDisk) × (PricePerDiskDrive / PricePerMBofRAM). It is derived using formulas for the cost of RAM to hold a page in the buffer pool and the cost of a (fractional) disk to perform I/O every time a page is needed , equating these two costs, and solving the equation for the interval between accesses. so the cost of disc I/O per access is

问题 I have an Xperia Neo V that does not have any internal storage - only an SD card as external storage, while the Galaxy S3 has both internal and external storage. When using this function Environment.getExternalStorageDirectory(); I can access files only on internal storage(S3) but there is no problem with Xperia Neo V. How can I access files on both internal and external storage? 回答1: I have an Xperia Neo V that does not have any internal storage All Android devices have internal storage,

问题 As pointed out in this question when using filestream with sql server 2008 the data must be stored locally. This means that I cannot use \\FILESERVER\FileStreamData\MyDatabase for Filestream filegroup path. So if I need to use filesrteam and have lots of data, is buying a very large hard drive the only solution (this could be quite limiting in many scenarios)? It is not possible to use a NAS? Typically one installs SQL Server on a perofrming machine but keeps the large documents in a NAS or