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  • Can an SSD notify the hosting OS that its wear level is getting high?

    - by Tony_Henrich
    I read a lot about SSDs and I am interested in them for server use. My biggest concern is their reliability. A lot of writes shortens their life span. I can mitigate this problem if I can run some kind of diagnostics on a regular basis on the SSD or if the SSD can automatically warn the OS that its reliability is reaching a critical level. Think of this as S.M.A.R.T or software like SpinRite for SSDs. Does anything I mentioned exist now? Which kind/brand of SSD does this? I don't mind swapping out a tired SSD for a newer one once a while. I am pretty sure that SSDs life is calculated in years and not in few months? For me, the improved performance will pay for the SSD over and over. I am planning to use plenty of RAM as well.

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  • Database design to hold multiple iteration measurements

    - by Valder
    Hi All. I am new to sqlite and SQL in general. I am keen to switch from flat-files to sqlite for holding some measurement information. I need a tip on how to better layout the database, since I have zero experience with this. I have a ~10000 unique statistic counters that are collected before and after each test iteration. Max number of iterations are 10, though it could be less. I was thinking the following: CREATE TABLE stat_names(stat_id, stat_name); CREATE TABLE stats_per_iteration(stat_id, before_iter_1, after_iter_1, before_iter_2, after_iter_2, ...); stat_names table would hold mapping of a full counter to a uniq stat_id. stats_per_iteration table would hold mesurement data 1 + 10 * 2 columns. stat_names.stat_id = stats_per_iteration.stat_id OR maybe I should have a separate table for each iteration? Which would results in 1 + 10 tables in database. Thanks!

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  • [grails + xfire] How to handle errors in SOAP services?

    - by Mulone
    Hi all, I'm implementing a web service on the xfire plugin. I was wondering how I'm supposed to handle the errors. I tried with this setup but the error is not returned to the SOAP client: GaSession[] myMethod( String userId ) throws MyException{ GaUser user = GaUser.findByUserId( userId ) if (!user) throw new MyException("user ${userId} does not exist") // do stuff and return valid results } Is there a standard way to handle errors and return them to the client in a clear way? My log is full of messages like: 2010-06-13 18:20:40,926 [Thread-289] DEBUG aegis.XMLClassMetaInfoManager - Mapping file : /com/mycompany/MyClass.aegis.xml not found. Is there a way to fix this? Cheers!

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  • hibernate - Postgres- target lists can have at most 1664 entries

    - by Vineyard
    We are using hibernate, postgres 8.3x Our entities are many to one mapped with eager fetching. We have multiple associations with Many to one mapping. As we added new columns to any other existing entities, We are getting below error: target lists can have at most 1664 entries I searched internet and they say this is due to More number of select statements in sql query (generated by hibernate) Can you any body please let us know if there is any configuration (in postgres) to update max number columns in configuration or any other solution to solve this issue. Thank you in advance.

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  • Is it possible to specify the name of the Index property to use for lists in a fluent nhibernate con

    - by Teevus
    When mapping a HasMany or HasManyToMany in fluent nhibernate, you can specify the column name to use for the list as a parameter to the AsList() method as follows: HasMany(c => c.Customers) .AsList(c => c.Column("PositionIndex")); I would prefer to be able to set this using a Fluent NHibernate convention (either a pre-existing one, or a custom one), especially since the default name appears to be "Index" which is a reserved word in MSSQL. I've tried using a custom convention implementing IHasManyConvention, but the instance parameter does not seem to contain the information about whether its a list, a bag, or a set, and also does not contain the column details for the index column. public void Apply(IOneToManyCollectionInstance instance) { } Any ideas?

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  • C++ Vector of pointers

    - by xbonez
    For my latest CS homework, I am required to create a class called Movie which holds title, director, year, rating, actors etc. Then, I am required to read a file which contains a list of this info and store it in a vector of pointers to Movies. I am not sure what the last line means. Does it mean, I read the file, create multiple Movie objects. Then make a vector of pointers where each element (pointer) points to one of those Movie objects? Do I just make two vectors - one of pointers and one of Movies and make a one-to-one mapping of the two vectors?

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  • Should i use partial classes as business layer when using entity framework?

    - by samsur
    I am working on a project using entity framework. Is it okay to use partial classes of the EF generated classes as the business layer. I am begining to think that this is how EF is intended to be used. I have attempted to use a DTO pattern and soon realized that i am just creating a bunch of mapping classes that is duplicating my effort and also a cause for more maintenance work and an additional layer. I want to use self-tracking-entities and pass the EF entities to all the layers. Please share your thoughts and ideas. Thanks

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  • How to correctly migrate urls from custom asp.net solution to Wordpress?

    - by Marek
    I have a web site built using asp.net with ugly URLs like /DisplayContent.aspx?id=789564. I know how to migrate the database, but the Wordpress urls will be (naturally) different. Can I simply write some mapping or do I have to include a rewrite rule for each subpage (300 pages) in .htaccess? Should I provide a rewrite rule for each existing page that would transform a full old url to the known new url, like for example: /DisplayContent.aspx?id=789798 -> /2010-5-10/Title-Of-The-Post Even if I manage to migrate the URLs, the structure of the HTML for the new content will naturally be different. How does this affect SEO? Should I run asp.net and wordpress side by side and issue the redirects from the asp.net application? What is the most efficient solution to this kind of migration of URLs without doing PHP programming?

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  • Simulators for thread scheduling on multicore

    - by shijie xu
    I am seeking a simulator for thread scheduling at multi-core architecture, that is mapping threads to the cores at runtime. During runtime, simulator collects overall cache and IPC statistics. I checked below simulators, but seems there are not sufficient for me: Simplescalar: A simulator only for single core. SESC: multiprocessor simulator with detailed power, thermal, and performance models, QSim: provides instruction-level control of the emulated environment and detailed information about the executing instruction stream. It seems both SESC and QSim supports instructions scheduling instead of thread scheduling on the cores? Anyone can help provide some clues or share experience for this part?

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  • MySQL: Matching inexact values using "ON"

    - by Brad
    I'm way out of my league here... I have a mapping table (table1) to assign particular values (value) to a whole number (map_nu). My second table (table2), is a collection of averages (avg) (I couldn't figure out how to properly make a markdown table, please feel free to edit!) table1: table2: (value)(Map_nu) (avg) ---- ----- 1 1 1.111 1.045 2 1.2 1.09 3 1.33333 1.135 4 1 1.18 5 1.389 1.225 6 1.42 1.27 7 1.07 1.315 8 1.36 9 1.405 10 I need to find a way to match the averages from table2 to the closest value in table1. It only need to match to the 2 digit past the decimal, so I've added the Truncated function SELECT map_nu FROM `table1` JOIN table2 ON TRUNCATE(table1.value,2)=TRUNCATE(table2.avg,2) I still miss the values that don't match the averages exactly. Is there a way to pick the nearest truncated value? Thanks!

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  • Fedora 14 - Error 5 - No space on Disk - After installation.

    - by amitahire
    I am new to Fedora, am still figure my way through it. I was going about tweaking it and preparing it to my needs, While installing through yum I dont have much other than the fact that I have to search for the packages. But when I open "Add/remove software" of Fedora. I am greeted with " No space left on the disk" and when I seek for more details it says " Disk Error :[errno 5] Input/output error" I did some research and I saw that it usually occurs during installation, but here I have successfully installed it. Can someone help me with it? Later on I even had notification of the same warning. And mind you I got loads of free space. Thanks for the help

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  • Hibernate entities: columns without entity properties

    - by lewap
    Is there a way to "magically" persist a column which is not represented as a property in an entity? Concretely I want to add audit info to an entity without having the audit info on the entity. The audit values are not stored in the entity, but are retrieved from the environment at the time of persisting the entity. This happens in a AuditInfoUserType. The nullSafeSet gets the info from the SecurityContext, instead of reading from the entity. In the hibernate mapping, however, the audit info properties have to be defined. Is there a way in hibernate to define columns without properties?

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  • Best virtualization solution for running Linux under Mac OS X?

    - by grumbles
    I'd like to run a virtualized Ubuntu instance under Mac OS X (10.6). I've used VirtualBox in the past, but am looking for something that will be faster, and don't mind paying for either Parallels Desktop or VMWare Fusion. Does anyone have experience running Linux guests under either or both programs? I'm primarily interested in doing software development on the Linux guest installation, but I'm also very concerned with the performance and responsiveness the guest OS. I have a mid-2010 15" MacBook Pro (2.66 GHz i5, 8 GB of RAM, NVIDIDA GeForce GT 330M). Thanks!

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  • My iPhone app runs fine in simulator but quit in device (iPod touch 3.1.2) test, I got the following

    - by Mickey Shine
    I was running myapp on an iPod touch and I noticed it missed some libraries. Is that the reason? [Session started at 2010-03-19 15:57:04 +0800.] GNU gdb 6.3.50-20050815 (Apple version gdb-1128) (Fri Dec 18 10:08:53 UTC 2009) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "--host=i386-apple-darwin --target=arm-apple-darwin".tty /dev/ttys007 Loading program into debugger… Program loaded. target remote-mobile /tmp/.XcodeGDBRemote-237-78 Switching to remote-macosx protocol mem 0x1000 0x3fffffff cache mem 0x40000000 0xffffffff none mem 0x00000000 0x0fff none run Running… [Switching to thread 11779] [Switching to thread 11779] sharedlibrary apply-load-rules all (gdb) continue warning: Unable to read symbols for "/Library/MobileSubstrate/MobileSubstrate.dylib" (file not found). 2010-03-19 15:57:18.892 myapp[2338:207] MS:Notice: Installing: com.yourcompany.myapp [myapp] (478.52) 2010-03-19 15:57:19.145 myapp[2338:207] MS:Notice: Loading: /Library/MobileSubstrate/DynamicLibraries/Backgrounder.dylib warning: Unable to read symbols for "/Library/MobileSubstrate/DynamicLibraries/Backgrounder.dylib" (file not found). warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.2.sdk/usr/lib/libsubstrate.dylib" (file not found). MS:Warning: message not found [myappAppDelegate applicationWillResignActive:] MS:Warning: message not found [myappAppDelegate applicationDidBecomeActive:] 2010-03-19 15:57:19.550 myapp[2338:207] in FirstViewController 2010-03-19 15:57:20.344 myapp[2338:207] in load table view 2010-03-19 15:57:20.478 myapp[2338:207] in loading splash view 2010-03-19 15:57:22.793 myapp[2338:207] in set interface Program received signal: “0”. warning: check_safe_call: could not restore current frame

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  • Why my backup to USB Drive is too slow?

    - by Jonas
    I have tried several backup solutions for my data and none of them was good enough. I basically want to make a copy of my files to an attached USB Drive from time to time. I don't mind starting my backups manually, since the USB Drive is not always connected. My problem is that my data contains a lot of files (a huge amount), so backing up takes forever (more than 20 hours). Using "rsync" an other similar solutions is not working because the I/O needed to check the file for changes takes longer than the time to actually copy it. Any suggestions?

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  • Android SDK and Java

    - by Soonts
    Android SDK Manager complains "WARNING: Java not found in your path". Instead of using the information from Windows registry, the software tries to search Java in the default installation folders, and fails (I don't install software in program files because I don't like space characters in my paths). Of course I know how to modify the %PATH% environment variable. The question is — which Java does it need? After installing the latest JDK, I’ve got 4 distinct versions of java.exe file, in the following 4 folders: system32, jre6\bin, jdk1.6.0_26\bin, and jdk1.6.0_26\jre\bin. Size ranges from 145184 to 171808. All of them print version “1.6.0_26” when launched with the “-version” argument. The one in system32 has .exe version “6.0.250.6”, the rest of them is “6.0.260.3”. All 4 files are different (I’ve calculated the MD5 checksums). Q1. Which folder should I add to %PATH% to make the Android SDK happy? Q2. Why does Oracle build that many variants of java.exe of the same version for the same platform? Thanks in advance! P.S. I'm using Windows 7 SP1 x64 home premium, and downloaded the 64-bit version of JDK, jdk-6u26-windows-x64.exe.

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  • Generate service layer with Hibernate

    - by gmate
    Hi all! I generate *.hbm.xml mapping files and *.java file from the DB schema, with Hibernate tools. My question is, that is there any option, to generate service classes also? These are the classes where I implement the store(), find(), delete(), etc... methods. I know that for C# there are many solutions to generate almost everything. I'm looking for the same, but with Hibernate. Is there any? Thanks for every reply in advance!

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  • Splitting a double in two, C#

    - by Stacey
    I'm attempting to use a double to represent a bit of a dual-value type in a database that must sometimes accept two values, and sometimes accept only one (int). So the field is a float in the database, and in my C# code, it is a double (since mapping it via EF makes it a double for some reason... ) So basically what I want to do .. let's say 2.5 is the value. I want to separate that out into 2, and 5. Is there any implicit way to go about this?

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  • windows 7 Home Premium (64 bit) won't boot up, I've tried system repair startup

    - by KamilB
    I've been trying to get my computer to boot up in the last 2 hours. I've tried using the system repair at start up, but all that does is it sends me to a screen with the stock Windows background that is enlarged with a cursor on the screen. It's not frozen and I can move the cursor around, but there is nothing to click on. I've tried to get into Task Manager and such, but the shortcut doesn't work. I have no back ups of the OS as it came pre-installed on the computer. Is there anyway for me to get my computer to work (I don't mind starting fresh)? I do have access to another computer but it's my brothers and it has Windows XP (I'd like to keep my Windows 7).

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  • What components should I upgrade to squeeze more life of my pc? [on hold]

    - by Jared
    Hi my current specs are CPU: Intel Core i5 750 2.66 GHz, Socket 1156 Motherboard: Asus P7P55 LX Motherboard, Socket 1156, 4xDIMM DDR3, 2xPCIe-16, 3xPCI, 2xPCIe-1, 14xUSB2, Audio, 1xATA, 6xSATA, RAID, ATX HDD: Seagate Barracuda 7200.11 ST31500341AS Hard Disk Drive, 1500GB, 7200rpm, 32MB Cache, SATA-2 RAM: G.Skill Ripjaw F3-12800CL8D-4GBRM, 2x2GB, DDR3-1600, PC3-12800, CL8, DIMM Video: MSI Radeon 5850 R5850-PM2D1G Video Card, 1024MB, DDR5, PCIe-16, DVI, CrossFire, HDMI PSU: Vantec ION2, 620W ATX PSU, SLI Ready, Black Firstly I know it badly needs an SSD, for which I'm thinking of the Samsung 250gb 840 EVO series. The ram could do with another 4GB, for which I am thinking of replacing the 2x2GB for 2x4GB of the same type. My video card is struggling with the latest releases, so vitally should I ditch the video card and go for something newer (ATI 7850, GTX 660?) or try and get another 5850 for crossfire support? Bearing in mind 5850's are sort of hard to come buy now as they are not stocked in shops usually, which means they have to be bought second hand.

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  • Switching from php to python

    - by ts
    Hello I am trying to make a list of things which can be difficult/surprising to someone who is changing language from PHP to Python. so far i have rather short list: forget require / include, learn import (this was most difficult to me - to understand package - module - class - object hierarchy and its mapping to filesystem) you can't just upload file on server to have webpage (-mod_python, wsgi etc) learn the python way for use variable class names (new $class() vs import + getattr) / operator in python 2.x and all float-related horrors those were difficult to me, it takes few days before mind adapts a new paradigm after i found that there is few other areas which could be challenging for someone with (too) many years of php: everything is an object you have to live with exceptions array vs list, set, dictionary, tuple ... learn (effective) list comprehensions learn generators any other ideas / personal experiences ?

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  • Problem creating sitecollection when database attached has been deleted

    - by pkspt
    Hi, I created one new sitecollection in new contentdatabase but later i changed my mind and decided to create it in the same database as of the webapplication. I deleted the sitecollection I created through newdatabase and bt now when I am creating that site again its getting attached to the new database which got created above not the same one? Any solution for that I tried deleting database which got created after deleting site collection. Now, when I when I am trying to create a site its looking for old database and giving me error as its not able to open it. Any suggestions on this one..?

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  • Setting up IIS 7.5 for AD Client Certificates for iOS devices

    - by vonsch
    I am working on getting an iPad to auth to an IIS7.5 website using a local certificate mapped to a user in AD. I am not, in any sense of the word, an IIS admin. I essentially need to setup a proof of concept. I believe that this may work, but I just have no idea how to do it. What I have so far is an iPad with a user certificate installed. I have this user certificate added the correlating user account in AD. What I would like is a basic text webpage to load showing the user that it is authenticating. I would like this page to not be viewable unless it is client certificate authenticated. I don't mind doing the legwork, but I really don't know where to begin on the IIS side. Can anyone point me in the right direction?

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  • License key pattern detection?

    - by Ricket
    This is not a real situation; please ignore legal issues that you might think apply, because they don't. Let's say I have a set of 200 known valid license keys for a hypothetical piece of software's licensing algorithm, and a license key consists of 5 sets of 5 alphanumeric case-insensitive (all uppercase) characters. Example: HXDY6-R3DD7-Y8FRT-UNPVT-JSKON Is it possible (or likely) to extrapolate other possible keys for the system? What if the set was known to be consecutive; how do the methods change for this situation, and what kind of advantage does this give? I have heard of "keygens" before, but I believe they are probably made by decompiling the licensing software rather than examining known valid keys. In this case, I am only given the set of keys and I must determine the algorithm. I'm also told it is an industry standard algorithm, so it's probably not something basic, though the chance is always there I suppose. If you think this doesn't belong in Stack Overflow, please at least suggest an alternate place for me to look or ask the question. I honestly don't know where to begin with a problem like this. I don't even know the terminology for this kind of problem.

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  • How to recover logical volume deleted with lvremove

    - by John P
    I am on CentOS 5.5 and am running Xen. I have a large volume group that I create logical volumes on using lvcreate. Today I had a customer cancel her account, then change her mind about an hour later. Unfortunately I had already removed the LVM her Xen image resided on. (just using a standard lvremove ). There has been no other LVM activity on this disk since then (nothing else added or deleted). Is it possible to "undo" a lvremove, or recover logical volume? If so, how would I go about it?

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