storage

问题 I have a couple objects, Location, in my app stored in an ArrayList and use parcelable to move these between activities. The code for the object looks like this: public class Location implements Parcelable{ private double latitude, longitude; private int sensors = 1; private boolean day; private int cloudiness; /* Måste ha samma ordning som writeToParcel för att kunna återskapa objektet. */ public Location(Parcel in){ this.latitude = in.readDouble(); this.longitude = in.readDouble(); this

问题 NoSQL databases like Couchbase do hold a lot of documents in memory, hence their enormous speed but it's also putting a greater demand on the memory size of the server(s) it's running on. I'm looking for the best strategy between several contrary strategies of storing documents in a NoSQL database. These are: Optimise for speed Putting the whole information into one (big) document has the advantage that with a single GET the information can be retrieved from memory or from disk (if it was

问题 I have an application database with a table for users (1kbyte of data per user based on counting fields * typelength), and about 100 things of the same size belonging to a user (0.5 kbyte per thing), and it is in a "user" table and a "thing" table. That would seem to lead to about 51kbytes of data per user. However, I have heard that for MySQL, I should double it to cover index tables, which would get me to 102kbytes/user Is that true? Are there any other data expansion factors to consider

问题 I'm trying to create a solution that has a lower-level library that will know that it needs to save and load data when certain commands are called, but the implementation of the save and load functions will be provided in a platform-specific project which references the lower-level library. I have some models, such as: type User = { UserID: UserID Situations: SituationID list } type Situation = { SituationID: SituationID } And what I want to do is be able to define and call functions such as:

问题 I am trying to understand how the column order minimize the table size in PostgreSQL. Example: CREATE TABLE test ( column_1 int ,column_2 int ,column_3 bigint ,column_4 bigint ,column_5 text ,column_6 text ,column_7 numeric(5,2) ,column_8 numeric(5,2) ,column_9 timestamp ,column_10 boolean ,column_11 boolean ); INSERT INTO test VALUES(1,1,1,1,'test','test_1',12,12,current_timestamp,true,false); SELECT pg_column_size(test.*) FROM test; pg_column_size ---------------- 82 (1 row) The tuple size:

问题 The problem is that my app saves the picture twice; one in the camera folder and the other in the folder I specified. but when I tested the app on another device, that didn't happen! //lunch the camera and make a file to save the image in and pass it with the camera intent public void lunchCamera() { Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); // Ensure that there's a camera activity to handle the intent if (takePictureIntent.resolveActivity(getPackageManager()) !=

问题 I have two models: container : handles file uploading and works fine in loopback explorer. Crawler : have multiple properties. one of the properties is script that user can upload a script file to this model. crawler.json : { "name": "Crawler", "base": "PersistedModel", "idInjection": true, "options": { "validateUpsert": true }, "properties": { "name": { "type": "string", "required": true }, "script": { "type": "string" }, "startCount": { "type": "number", "default": 0 }, "created_at": {

问题 So I wrote a little experiment testing underflowing & overflowing, using c and a 64 bit machine. For type int the min/max values are: int tmax = 2147483647; int tmin = -2147483648; I know understand how two's-complement works, that isn't my question. So I thought, well what happens if I make something negative tmin? That is: int tmin = -2147483648; int negativeTmin = -tmin; It ends up still being tmin. (That is, negativeTmin will be -2147483648) My question is why is that? Since positive 2

问题 When i capture an image from the camera (from the device home screen) and check the image size on the SD card, it shows between 300-500 Kb. But when i capture an image in my Application using the Camera Intent, and save it on SD card(in a new folder) it shows image size between 5-10 Kb. This is the code i am using to save the Image on the SD card after taking the picture in the onActivityResult: Bitmap bit = (Bitmap) data.getExtras().get("data"); ByteArrayOutputStream bao = new

问题 I have an ISO file from MSFT that is a bootable DVD. I uploaded it to a storage account and stored it in a blob in Azure. Now I want to use it to create a VM. When I select to create a VM, I do not see that as an option. Any ideas how I can provision this? My laptop does not have enough resources to create a Hyper-V VM to then upload the disk. Thanks! 回答1: In Azure you do not have console access to a VM. The only way to access a VM is some kind of remote access like RDP, PowerShell Remoting,