Calculation of row size is much more complex than that. Storage is typically partitioned in 8 kB data pages. There is a small fixed overhead per page, possible remainders not big enough to fit another tuple, and more importantly dead rows or a percentage initially reserved with the FILLFACTOR setting. And there is even more … Read more
I used this to create folder/file in internal memory : File mydir = context.getDir(“mydir”, Context.MODE_PRIVATE); //Creating an internal dir; File fileWithinMyDir = new File(mydir, “myfile”); //Getting a file within the dir. FileOutputStream out = new FileOutputStream(fileWithinMyDir); //Use the stream as usual to write into the file.
The rule for storing image data in Core Data is as follows: < 100 kb store in the related entity (person, address, whatever). < 1 mb store in a separate entity on the other end of a relationship to avoid performance issues. 1 mb store on disk and reference the path in your Core Data … Read more
Have a look at this answer: Storing Images in DB – Yea or Nay? Essentially, the space and performance hit can be quite big, depending on the number of users. Also, keep in mind that Web servers are cheap and you can easily add more to balance the load, whereas the database is the most … Read more
Disk space is not the issue… but memory and performance will be. Double the page reads, double index size, strange LIKE and = constant behaviour etc Do you need to store Chinese etc script? Yes or no… And from MS BOL “Storage and Performance Effects of Unicode” Edit: Recent SO question highlighting how bad nvarchar … Read more
Most Android and iPhone apps I have seen use an initial screen or dialog box to ask for credentials. I think it is cumbersome for the user to have to re-enter their name/password often, so storing that info makes sense from a usability perspective. The advice from the (Android dev guide) is: In general, we … Read more
The modular crypt format for bcrypt consists of $2$, $2a$ or $2y$ identifying the hashing algorithm and format a two digit value denoting the cost parameter, followed by $ a 53 characters long base-64-encoded value (they use the alphabet ., /, 0–9, A–Z, a–z that is different to the standard Base 64 Encoding alphabet) consisting … Read more
Use this function to save your bitmap in SD card private void SaveImage(Bitmap finalBitmap) { String root = Environment.getExternalStorageDirectory().toString(); File myDir = new File(root + “/saved_images”); if (!myDir.exists()) { myDir.mkdirs(); } Random generator = new Random(); int n = 10000; n = generator.nextInt(n); String fname = “Image-“+ n +”.jpg”; File file = new File (myDir, … Read more
“Column Tetris” Actually, you can do something, but this needs deeper understanding. The keyword is alignment padding. Every data type has specific alignment requirements. You can minimize space lost to padding between columns by ordering them favorably. The following (extreme) example would waste a lot of physical disk space: CREATE TABLE t ( e int2 … Read more
I’m in charge of some applications that manage many TB of images. We’ve found that storing file paths in the database to be best. There are a couple of issues: database storage is usually more expensive than file system storage you can super-accelerate file system access with standard off the shelf products for example, many … Read more