MD5 key for huge file

Hi,
I want generated md5 key for a set of file which contains a lot of data.
Big file implies long computation time... so, how can I improving this ?
For now, I have a really simple algorithms :
public byte[] createMD5(File file) throws NoSuchAlgorithmException, IOException {
          InputStream fis = new FileInputStream(file);
          byte[] buffer = new byte[1024];
          MessageDigest complete = MessageDigest.getInstance("SHA");
          int numRead;
          do {
            numRead = fis.read(buffer);
            if (numRead > 0) {
              complete.update(buffer, 0, numRead);
          } while (numRead != -1);
          fis.close();
          return complete.digest();
     }I have no found benchmark about algorithm SHA, MD5 ...
Thanks you,
Edited by: phpvik on May 20, 2009 1:19 PM

phpvik wrote:
sabre150 wrote:
phpvik wrote:
sabre150 wrote:
What speed are you looking for?I expect 4Go (10.000 files) in 10 min I can do 5,600 files totalling 4,3 GBytes in 48 seconds.Ok, that's good .. Do you have any piece of code ?Yep. Plenty.
>
>>
(I'm working with cluster).I'm not sure I understand the relevance. If you mean that you have N machines working on the problem then you should be able to do it in 1/N th the time.I've just want to say that I can distributed MD5 encrypt thread over computing farm.
My algorithms have to be safe because my java application will be loaded in 64bits JVM (Linux, Windows, Mac..).I definitely do not understand this since one jar will work on 32 or 64 bit Linux, Windows, Mac and uncle tom cobbley and
and allMy bytes code have to be compliant. I'm not sure that MD5 algorithm don't take care of OS architecture. But I'm okay with you : compile one time, use everywhere...I don't understand. Compliant with what? What in the MD5 specification makes it OS architecture dependent?
>
>
>>>
Did MD5 encryption work fine ?Of course. What makes you think the Java MD5 is wrong or in any way inferior to other MD5 ?No, but I remembers someone who say that MD5's implementation can be wrong.. But I trust in Java !Then ask the 'someone' for information about the faulty implementation.

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Hi Odie..
I tried to run your code through all the xml files but it is taking too much time. It has not ended even after 3hours.
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Please find my execution plan for one single xml file with your code.
"PLAN_TABLE_OUTPUT"
"Plan hash value: 2771779566"
"| Id | Operation                                     | Name                                     | Rows   | Bytes | Cost (%CPU)| Time     |"
"|   0 | INSERT STATEMENT                   |                                              |   499G |   121T |   434M (2) |999:59:59 |"
"|   1 | LOAD TABLE CONVENTIONAL    | WATCHLIST_NAMEDETAILS |            |           |                 |                 |"
"|   2 |   SORT AGGREGATE                   |                                             |     1      |     2    |                 |          |"
"|   3 |    XPATH EVALUATION                 |                                             |             |          |                 |          |"
"|   4 |   SORT AGGREGATE                   |                                             |     1      |     2    |                 |          |"
"|   5 |    XPATH EVALUATION                 |                                             |             |          |                 |          |"
"|   6 |   SORT AGGREGATE                   |                                             |     1       |     2   |                 |          |"
"|   7 |    XPATH EVALUATION                 |                                             |              |         |                 |          |"
"|   8 |   SORT AGGREGATE                   |                                             |     1        |     2 |                 |          |"
"|   9 |    XPATH EVALUATION                 |                                             |              |         |                 |          |"
"| 10 |   NESTED LOOPS                       |                                             |   499G    | 121T |   434M (2) | 999:59:59 |"
"| 11 |    NESTED LOOPS                      |                                             |    61M     | 14G | 1222K (1) | 04:04:28 |"
"| 12 |     NESTED LOOPS                     |                                             | 44924      | 10M |    61   (2) | 00:00:01 |"
"| 13 |      MERGE JOIN CARTESIAN      |                                             |     5         | 1235 |     6   (0) | 00:00:01 |"
"|* 14 |       TABLE ACCESS FULL          | XMLPERSON                        |     1          | 221 |     2   (0) | 00:00:01 |"
"| 15 |       BUFFER SORT                     |                                             |     6          | 156 |     4   (0) | 00:00:01 |"
"|* 16 |        TABLE ACCESS FULL         | MASTER_NAMETYPES        |     6          | 156 |     3   (0) | 00:00:01 |"
"| 17 |      XPATH EVALUATION             |                                             |                |         |               |          |"
"|* 18 |     XPATH EVALUATION              |                                             |               |          |               |          |"
"| 19 |    XPATH EVALUATION               |                                              |               |         |              |          |"
"Predicate Information (identified by operation id):"
" 14 - filter(""P"".""FILENAME""='PFA2_95001_100000_F.xml')"
" 16 - filter(""N"".""RECORDTYPE""='Person')"
" 18 - filter(""N"".""NAMETYPE""=CAST(""P1"".""C_01$"" AS VARCHAR2(255) ))"
"Note"
"   - Unoptimized XML construct detected (enable XMLOptimizationCheck for more information)"
Please note that this is for a single xml file. I have like more than 400 similar files in the same table.
And for your's as well as Jason's Question:
What are you trying to accomplish with
replace(replace(t.originalName, '<OriginalName>'),'</OriginalName>', '#@#') originalName
originalName XMLTYPE PATH 'OriginalName'
Like Jason, I also wonder what's the purpose of all those XMLType projections and strange replaces in the SELECT clause
What I was trying to achieve was to create a table containing separate rows for all the multi item child nodes for this particular xml.
But since there was an error beacuse of multiple child nodes like 'ORIGINALNAME' under 'NAMEVALUE' node, I tried this script to insert those values by providing a delimiter and replacing the tag names.
Please see the link for more details - http://stackoverflow.com/questions/16835323/construct-xmltype-query-to-store-data-in-oracle11g
This was the execution plan for one single xml file with my code :
Plan hash value: 2851325155
| Id | Operation                                                     | Name                                         | Rows | Bytes   | Cost (%CPU) | Time       |    TQ | IN-OUT | PQ Distrib |
|   0 | SELECT STATEMENT                                   |                                                 | 7487   | 1820K |    37   (3)        | 00:00:01 |           |             |            |
|* 1 | HASH JOIN                                                 |                                                 | 7487   | 1820K |    37   (3)        | 00:00:01 |           |             |            |
|* 2 |   TABLE ACCESS FULL                                | MASTER_NAMETYPES            |     6     |   156     |     3   (0)         | 00:00:01 |           |             |            |
|   3 |   NESTED LOOPS                                        |                                                 | 8168   | 1778K |    33   (0)        | 00:00:01 |           |             |            |
|   4 |    PX COORDINATOR                                    |                                                 |            |             |                      |               |           |             |            |
|   5 |     PX SEND QC (RANDOM)                           | :TQ10000                                  |     1    |   221      |     2   (0)        | 00:00:01 | Q1,00 | P->S     | QC (RAND) |
|   6 |      PX BLOCK ITERATOR                              |                                                 |     1    |   221      |     2   (0)        | 00:00:01 | Q1,00 | PCWC   |            |
|* 7 |       TABLE ACCESS FULL                            | XMLPERSON                            |     1    |   221      |     2   (0)        | 00:00:01 | Q1,00 | PCWP   |            |
|   8 |    COLLECTION ITERATOR PICKLER FETCH | XQSEQUENCEFROMXMLTYPE | 8168 | 16336    |    29   (0)       | 00:00:01 |           |               |            |
Predicate Information (identified by operation id):
   1 - access("N"."NAMETYPE"=CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(SYS_XQEXTRACT(VALUE(KOKBF$),'/*/@NameType'),0,0,20971520,0),50,1,2
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   2 - filter("N"."RECORDTYPE"='Person')
   7 - filter("P"."FILENAME"='PFA2_95001_100000_F.xml')
Note
   - Unoptimized XML construct detected (enable XMLOptimizationCheck for more information)
Please let me know whether this has helped.
My intention is to save the details in the xml to different relational tables so that I can easily query it from my application. I have similarly many queries which inserts the xml values to different tables like the one which I have mentioned here. I was thinking of creating a stored procedure to insert all these values in the relational tables once I receive the xml files. But even a single query is taking too much time to complete. Could you please help me in this regard. Waiting for your valuable feedback.

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I can't reopen my iTunes after I have to force quit when it does not respond. I get this message:
"The iTunes Library.itl file is locked, on a locked disk, or you do not have write permission for this file."
I've read to do the solutions. I right clicked on both the iTunes and Music folder and went to info for each. On both the lock at the bottom of the Get Info was locked. All of my users including admin can read and write all files within those folders. They are even a shared folder. I clicked on the lock to unlock it, typed in my admin password, and went to the gear to apply to all files inside. After doing that I keep getting the saved message.
I tried another way that I've found online to move my ituneslibrary folder to the desktop and then open my iTunes. In theory the iTunes is supposed to ask for where the iTunes library is. Once that is prompted you quit iTunes and drag the iTunes Library folder back to the folder from the desktop and reopen iTunes to apprently solve the problem. However, when I move the iTunes Library file to the desktop and try to reopne iTunes the icon just keeps bouncing and when I right click the application does not respond.
This problem is only resolved if I restart/shut down my macbook pro which is a 15-inch Core 2 Duo with intel. It will be 5 years old in December. I currently have Lion and the latest iTunes 10.5. This problem started in late December.

If you hold down the option key when starting iTunes, it will allow you to select a library or create a new one.
You can create a new one, and then add all of your iTunes music back in by simply dragging the old iTunes music file onto iTunes.
There are more detailed instructions at http://support.apple.com/kb/HT1451#
It will show you how to re-build your iTunes database file.

I am trying to open iTunes on my Windows 7 PC and am getting the following message...the itunes library can not be found or created. The default location for this file is in the "iTunes" folder in the "Music" folder. Any ideas?

I am trying to open iTunes on my Windows 7 PC and am getting the following message...the itunes library can not be found or created. The default location for this file is in the "iTunes" folder in the "Music" folder. Any ideas?

Let's try this first. Hold down the Shift key while you try to launch iTunes. You should eventually see the following dialog:
Click "Choose library". Browse to inside the following location (depending on what operating system you're running):
Operating System
Default location of iTunes library
Microsoft Windows XP
\Documents and Settings\[your username]\My Documents\My Music\iTunes\
Microsoft Windows Vista
\Users\[your username]\Music\iTunes\
Microsoft Windows 7
\Users\[your username]\My Music\iTunes\
... and open the iTunes library you find in there.

Can you set a second "Open with:" application for a file?

Hi all,
I was wondering if something like this exists for OS X Lion or greater: you can set a default application to open a type of file, say Safari for all .html files, but can you set a second default application for a file?
I usually open files using command + o or command + down arrow from the Finder and I've often thought how good it would be to hit an alternate keyboard shortcut to open the selected file in a secondary default application.
For example, if I'm making a web page and have the .html selected in the finder I can hit command + o (or command + down arrow) to open it in Safari and if the file isn't open in my editor and is selected in the Finder I can hit, say command + option + o (or command + option + down arrow) to open the .html file in my editor.
Does anyone know if this can be achieved in OS X Lion or greater?
Any advice is greatly appreciated.
Thanks.

Hi all,
If anyone's interested in a partial solution, I've rigged up the following.
I ended up using an Automator action coupled with Spark to capture a keyboard key combination. Spark: http://www.shadowlab.org/Software/spark
I've used Spark before with good results, and although it's from 2008 it still works on Lion.
I created an Automator action that does two things:
gets the selected Finder items
opens finder items in the text editor I'm using.
I then saved the workflow as an application so that Spark could run it.
I've set up a keyboard shortcut that Spark picks up and calls my Automator workflow. It all seems to work nicely.
So, I've created a specific "open selected file with <text editor>" keyboard shortcut that should do for the time being.

MD5 key for huge file

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