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• Hibernate list operation question

  - by Sumit Kishore

  I'm working on a utility to update a list of entities in a database as a group. The database contains a list of entities. The result of the update is a new list. The API accepts this new list. The update may end up modifying some of the entities in the list, creating new ones and deleting some. So at the entity level, I may have to do any of an insert, delete or update operation. But it's always true that the final list in the database will be the same as the list passed down to the API. Is there in Hibernate a way to treat this operation at the list level, that is, tell Hibernate to persist this list of entities, and let it take care of which need to be created, updated or deleted? There is no entity/table representing this list, btw. Just the entities themselves in a table.

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• WCF Service worker thread communicate with ServiceHost thread

  - by Brent

  I have a windows NT Service that opens a ServiceHost object. The service host context is per-session so for each client a new worker thread is created. What I am trying to do is have each worker thread make calls to the thread that started the service host. The NT Service needs to open a VPN connection and poll information from a device on the remote network. The information is stored in a SQL database for the worker threads to read. I only want to poll the device if there is a client connected, which will reduce network trafic. I would like the worker threads to tell the service host thread that they are requesting information and start the polling and updating the database. Everything is working if the device is alway being polled and the database being updated.

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• Windows Question: RunOnce/Second Boot Issues

  - by Greg

  I am attempting to create a Windows XP SP3 image that will run my application on Second Boot. Here is the intended workflow. 1) Run Image Prep Utility (I wrote) on windows to add my runonce entries and clean a few things up. 2) Reboot to ghost, make image file. 3) Package into my ISO and distribute. 4) System will be imaged by user. 5) On first boot, I have about 5 things that run, one of which includes a driver updater (I wrote) for my own specific devices. 6) One of the entries inside of HKCU/../runonce is a reg file, which adds another key to HKLM/../runonce. This is how second boot is acquired. 7) As a result of the driver updater, user is prompted to reboot. 8) My application is then launched from HKLM/../runonce on second boot. This workflow works perfectly, except for a select few legacy systems that contain devices that cause the add hardware wizard to pop up. When the add hardware wizard pops up is when I begin to see problems. It's important to note, that if I manually inspect the registry after the add hardware wizard pops up, it appears as I would expect, with all the first boot scripts having run, and it's sitting in a state I would correctly expect it to be in for a second boot scenario. The problem comes when I click next on the add hardware wizard, it seems to re-run the single entry I've added, and re-executes the runonce scripts. (only one script now as it's already executed and cleared out the initial entries). This causes my application to open as if it were a second boot, only when next is clicked on the add hardware wizard. If I click cancel, and reboot, then it also works as expected. I don't care as much about other solutions, because I could design a system that doesn't fully rely on Microsoft's registry. I simply can't find any information as to WHY this is happening. I believe this is some type of Microsoft issue that's presenting itself as a result of an overstretched image that's expected to support too many legacy platforms, but any help that can be provided would be appreciated. Thanks,

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• MySQL and PostgreSQL on the same hardware

  - by Kamil Kisiel

  We recently bought some new hardware for a database server which we were intending to dedicate to the operation of PostgreSQL. However now we have the requirement to also run MySQL as some software we want to use only supports that database. Since the storage on this machine is the most suitable for hosting a DB, and we don't currently have the budget for more hardware,we're thinking of running both of them on the same server. Are there any caveats or best practices we should be aware of?

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• What is the android_metadata table?

  - by Janusz

  I try to integrate an existing database file into my Android project. I follow the instructions on this blog. They write that I have to add a table android_metadata with a column called locale and put en_US into it. I try to figure out what this table is used for. Because my database content is german. Maybe i then should not put en_US into it? Is this required for localisation of the database content or is the table not needed at all?

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• Alsa devices under Wine

  - by Roberto Aloi

  Hi all, I'm running OpenSuse 11.2 and Wine 1.1.28. Even if audio is perfectly working fine for me (Skype, Banshee, etc), when I try to configure audio for Wine (to use Spotify) I cannot hear anything from the audio test. In the winecfg audio tab, ALSA is checked, but no devices are available. I tried to run alsaconf (it needs root permissions) but it returns: No supported PnP or PCI card found No legacy drivers available, either. Any idea?

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• Map a column to be IDENTITY in db with EF4 Code-Only

  - by Tomas Lycken

  Although I have marked my ID column with .Identity(), the generated database schema doesn't have IDENTITY set to true, which gives me problems when I'm adding records. If I manually edit the database schema (in SQL Management Studio) to have the Id column marked IDENTITY, everything works as I want it - I just can't make EF do that by itself. This is my complete mapping: public class EntryConfiguration : EntityConfiguration<Entry> { public EntryConfiguration() { Property(e => e.Id).IsIdentity(); Property(e => e.Amount); Property(e => e.Description).IsRequired(); Property(e => e.TransactionDate); Relationship(e => (ICollection<Tag>)e.Tags).FromProperty(t => t.Entries); } } As I'm using EF to build and re-build the database for integration testing, I really need this to be done automatically...

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• 50um vs. 62.5um fiber compatability

  - by murisonc

  I've heard that there are compatibility problems when using 50um fiber with some fiber converters. After some research I'm thinking this is a legacy issue when using slower devices (100 Base FX) that used LEDs. I was told that the fiber converters are made for a certain size of fiber core and wont work with 50um fiber. Am I right in thinking this is just a corporate knowledge thing that is outdated when using 1000 Base SX converters (which should be using lasers instead of LEDs)?

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• TFSBuild.Proj and Manual SQL Server Work Help?

  - by ScSub

  Using the VS 2008 GDR update, I have created a database project. I have created a SQL Server deployment package. I have created a database unit test. Using some wizards, the stuff got into my tfsbuild.proj file so near the end of the automated build process a database is created. I lack a little control of the whole process, I now see. What I would like to do is manually deploy the DB, run 3 custom scripts against the DB, and then manually start the DB unit test. I have other non-DB unit tests that already run. I do not want to use VSMDI or ordered unit test stuff because in out multi-developer environment it gets messy. Help!

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• AWS EC2 & WordPress / WooCommerce, Product pages dragging

  - by Stephen Harman

  http://ec2-54-243-161-225.compute-1.amazonaws.com/shop/product-category/dark-horse/ If you click on any of the products on this page you'll notice it either takes a minute or more to load or it doesn't load at all. I have about 11,000 products in the database each with about 3 images attached to them, the database is about 108mbs in size. Any suggestions on fixing this speed issue? Thank you in advance!

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• Hibernate AssertionFailure in different Threads

  - by bladepit

  I connect to my database with one session. I have always the same session in my hole program. My Thread "1" catches primary data from the database. The user must be allowed to cancel this thread. So if the user presses the cancel button to often or to fast (this is my interpretation) the following error occures: ERROR org.hibernate.AssertionFailure - HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session) org.hibernate.AssertionFailure: possible non-threadsafe access to the session The same errors occures if i cancel my thread "2" which is running in the background after my thread "1" ist finished and the try to load another primary data set from the database. Is the failure that i am using the same session in my two threads? What is the right way to solve such a problem?

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• Connect rails application to SQL Server 2005 from Windows

  - by Enrico Carlesso

  Hi guys. I (sadly) have to deploy a rails application on Windows XP which has to connect to Microsoft SQL Server 2005. Surfing in the web there are a lot of hits for connect from Linux to SQL Server, but cannot find out how to do it from Windows. Basically I followed these steps: Install dbi gem Install activerecord-sql-server-adapter gem My database.yml now looks like this: development: adapter: sqlserver mode: odbc dsn: test_dj host: HOSTNAME\SQLEXPRESS database: test_dj username: guest password: guest But I'm unable to connect it. When I run rake db:migrate I get IM002 (0) [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified I'm not a Windows user, so cannot understand really well the meaning of dsn element or so. Does someone have an idea how to solve this? Thanks in advance With Alexander tips now I've modified my database.yml to: development: adapter: sqlserver mode: odbc dsn: Provider=SQLOLEDB;Data Source=SCADA\SQLEXPRESS;UID=guest;PWD=guest;Initial Catalog=test_dj;Application Name=test But now rake db:migrate returns me: S1090 (0) [Microsoft][ODBC Driver Manager] Invalid string or buffer length Am I missing something?

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• How do I use custom member properties for people on my .NET website

  - by Jordan S

  I am trying to make an asp.net website using Visual web dev and C# that accesses data in an SQL database. For my site, I need to be able to save and access additional user properties such as age and gender. I have been playing around with the built in .NET Login tools but I don't understand how to keep track of the additional properties (age, gender...) I could store all the users information in my own database but how do I correlate the users data in my DB to the usernames in the member database that is automatically created?

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• MySQL installation question.

  - by srtriage

  I am far from a DBA and have a question. Recently I installed MySQL. On my machine C:\ is a 50GB partition of two mirrored 10k SAS drives. The remaining space on those drives is allocated to D:. I also have a SSD mounted as E:. When I installed MySQL, I installed it to E:\ assuming that that is where the database information would be held since I had installed it there. I am now seeing C:\ProgramData\MySQL\MySQL Server 5.1\data\peq, peq being the name of my main database. Is my database being stored in C:\ and if so, how do I fix it to store the DB on the SSD?

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• How common (or uncommon) is using full email address for email login?

  - by somecallmemike

  I was hoping you fine folks could comment on your experiences with using a full email address as a login name for an email service vs. using the username (everything before the @domain.tld). I ask because I have inherited a legacy email system in which usernames are completely unique, and users can log in via that username (to other services besides email as well) and I do not want to ask tens of thousands of users to have to update their email settings to support virtual domain hosting without good reason.

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• How can I find the space used by a SQL Transaction Log?

  - by Sean Earp

  The SQL Server sp_spaceused stored procedure is useful for finding out a database size, unallocated space, etc. However (as far as I can tell), it does not report that information for the transaction log (and looking at database properties within SQL Server Management Studio also does not provide that information for transaction logs). While I can easily find the physical space used by a transaction log by looking at the .ldf file, how can I find out how much of the log file is used and how much is unused?

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• Android app copy protection and data files

  - by Ben Mc

  I'm going to rephrase this question. As it turns out the original answer wasn't definitive and problems were found. ======================================================================= In my app, I access my sqlite database at the following hard-coded location in my code: /data/data/com.mydomain.appname/databases/database.db If I turn ON copy protection in the Market Place, will my app still have access to this location? Or will I have to change it to something like: */data-private/*data/com.mydomain.appname/databases/database.db (or something like this) Since I have a Dev phone only, I have no way of testing to see if my app still functions normally after turning on copy protection. Thank you!

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• Run a shell command with arguments from powershell script

  - by Mike Weerasinghe

  Hello, I need to extract and save a some tables from a remote SQL database using bcp. I would like to write a powershell script to invoke bcp for each table and save the data. So far I have this script that creates the necessary args for bcp. However I can not figure out how to pass the args to bcp. Every time I run the script it just shows the bcp help instead. This must be something really easy that I am not getting. #commands bcp database.dbo.tablename out c:\temp\users.txt -N -t, -U uname -P pwd -S <servername> $bcp_path = "C:\Program Files\Microsoft SQL Server\90\Tools\Binn\bcp.exe" $serverinfo =@{} $serverinfo.add('table','database.dbo.tablename') $serverinfo.add('uid','uname') $serverinfo.add('pwd','pwd') $serverinfo.add('server','servername') $out_path= "c:\Temp\db\" $args = "$($serverinfo['table']) out $($out_path)test.dat -N -t, -U $($serverinfo['uid']) -P $($serverinfo['pwd']) -S $($serverinfo['server'])" #this is the part I can't figure out & $bcp_path $args

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• sqlldr job not running through Autosys

  - by Frank

  I have a shell script that if run manually or via Cron executes fine and loads a delimited file using sqlldr to the database successfully. However via Autosys the script executes, sqlldr says it was successful, however the data is never actually loaded into the database. Has anyone ever experienced this before with the sqlldr/Autosys combination, and if so, knows of a workaround/fix?

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• XML: What to use as a list separator

  - by Heinzi

  There are two ways to specify lists of values in XML. Variant 1: <Database Name="myDatabase"> <Table Name="myTable1" /> <Table Name="myTable2" /> <Table Name="myTable3" /> ... </Database> Variant 2: <Database Name="myDatabase" Tables="myTable1 myTable2 myTable3 ..." /> Clearly, Variant 1 is cleaner and can be extended more easily, but im many cases Variant 2 is more readable and "user-friendly". When using Variant 2, what should be used as the separator? The XML Schema standard seems to prefer whitespace, whereas some real-world examples use commas instead. Is there a particular reason to choose one over the other (assuming that the values contain neither whitspace nor commas)?

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• transaction log shipping sql server 2005 to 2008

  - by Andrew Jahn

  I have a reporting setup with SSRS on our sql server 2005 database. Because sql server 2008 is not supported by the main program which populates our database we are stuck with 2005 on our prod database. Unfortunately when I run our weekly check reports the web interface constantly times out because the server cant do the conversion to PDF. I've read that sql server 2008's SSRS is ALOT better with memory management. I was wondering if I can do some kind transact log shipping subscription publication from 2005 to 2008? Am I chasing a dream here.

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• Anybody have experience with using Nexenta?

  - by churnd

  I'm evaluating the Nexenta platform to hopefully one day replace our legacy file servers. I would primarily use it as a CIFS server in an Active Directory environment. Anyone out there have any experience using it? Good? Bad? Which hardware vendor did you go with? Why? Did you build your own (Supermicro) or go prebuilt?

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• SQL locks between databases

  - by jesusbolivar

  Can a locked table on one database interfere with the operations of another database? The two databases aren't aware of each other. This is on SQL Server 2005.

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• SQL Server High Availability - Mirroring with MSCS?

  - by David

  I'm looking at options for high-availability for my SQL Server-powered application. The requirements are: HA protection from storage failure. Data accessibility when one of the DB servers is undergoing software updates (e.g. planned outage for Windows Update / SQL Server service-packs). Must not involve much in the way of hardware procurement. The application is an ASP.NET web application. The web application's users have their own database instances. I've seen two main options: SQL Server failover clustering, and SQL Server mirroring. I understand that SQL Server Failover Clustering requires the purchasing of a shared disk array and doesn't offer any protection if the shared storage goes down (so the documentation recommends to set up a Mirroring between two clusters). Database Mirroring seems the cheaper option (as it only requires two database servers and a simple witness box) - but I've heard it doesn't work well when you have a large number of databases. The application I'm developing involves giving each client their own database for their application - there could be hundreds of databases. Setting up the mirroring is no problem thanks to the automation systems we have in place. My final point concerns how failover works with respect to client connections - SQL Server Failover Clustering uses MSCS which means that the cluster is invisible to clients - a connection attempt might fail during the failover, but a simple reconnect will have it working again. However mirroring, as far as I know, requires that the client be aware of the mirrored partners: if the client cannot connect to the primary server then it tries the secondary server. I'm wondering how this work with respect to Connection Pooling in ASP.NET applications - does the client connection failovering mean that there's a potential 2-second (assuming 2000ms TCP timeout policy) pause when the connection pool tries the primary server on every connection attempt? I read somewhere that Mirroring can be used on top of MSCS which means that the client does not need to be aware of mirroring (so there wouldn't be any potential delays during connection, and also that no changes would need to be made to the client, not even the connection string) - however I'm finding it hard to get documentation or white papers on this approach. But if true, then it means the best method is then Mirroring (for HA) with MSCS (for client ignorance and connection performance). ...but how does this scale to a server instance that might contain hundreds of mirrored databases?

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• ruby on rails named scope implementation

  - by Engwan

  From the book Agile Web Development With Rails class Order < ActiveRecord::Base named_scope :last_n_days, lambda { |days| {:conditions => ['updated < ?' , days] } } named_scope :checks, :conditions => {:pay_type => :check} end The statement orders = Orders.checks.last_n_days(7) will result to only one query to the database. How does rails implement this? I'm new to Ruby and I'm wondering if there's a special construct that allows this to happen. To be able to chain methods like that, the functions generated by named_scope must be returning themselves or an object than can be scoped further. But how does Ruby know that it is the last function call and that it should query the database now? I ask this because the statement above actually queries the database and not just returns an SQL statement that results from chaining.

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