Search Results

Search found 26798 results on 1072 pages for 'difference between detach attach and restore backup a db'.

Page 308/1072 | < Previous Page | 304 305 306 307 308 309 310 311 312 313 314 315  | Next Page >

• On-the-fly lossless image compression

  - by geschema

  I have an embedded application where an image scanner sends out a stream of 16-bit pixels that are later assembled to a grayscale image. As I need to both save this data locally and forward it to a network interface, I'd like to compress the data stream to reduce the required storage space and network bandwidth. Is there a simple algorithm that I can use to losslessly compress the pixel data? I first thought of computing the difference between two consecutive pixels and then encoding this difference with a Huffman code. Unfortunately, the pixels are unsigned 16-bit quantities so the difference can be anywhere in the range -65535 .. +65535 which leads to potentially huge codeword lengths. If a few really long codewords occur in a row, I'll run into buffer overflow problems.

  Read the article

• geographical deployment Vs geo load balancing SharePoint 2010

  - by vrajaraman

  we have a company wide SharePoint portals planned for few thousand users. since the users are distributed among different countries and their applications (hosted in sharepoint) We would like to consider geo deployment Vs geo load balancing. Please share your inputs. We are aware of this, Geo SharePoint Cluster facilitates - Farms at Central and other sites , db into regional. 2 db cluster - syncing using logshipping or SAN sync or SQL 2008 features like database mirroing Vs Loading balancing using URL and some 3rd party. all farm,sites,db centralised. benefits expecting. 1 High availability. 2.diaster recovering management. 3.maintenance hope i miss some of the points to be covered

  Read the article

• Problem with SqlServer 2005 when openning connections

  - by Jose Obregon

  I have a Winforms application and I use EntLib to connect to a SQL Server 2005 DB. The application is working ok, but somethings, and lately more often, we have started receiving this error from the db when openning the connection: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) The problem is intermittent. The user works nice for a couple of hours and then suddenly the exception is thrown. Sometimes it happens when we run a small process that loads a file and then inserts the data to the db. Please if anybody has any thought on this help me

  Read the article

• How do I configure the binary log file for auditing in MySQL?

  - by Parth

  How to use Binary Log file for Auditing in MySQL? I want to track the change in a DB using Binary Log so that I can replicate these changes to other DB please do not give me hyperlinks for MySQL website. please direct me to find the solution EDIT I have looked for auditing options and created a script using Triggers for that, but due toi the Joomla DB structure it did'nt worked for me, hence I have to move on to Binary Log file concept now i am stucked in initiating the concept as I am not getting the concept of making the server master/slave, so can any body guide me how to actually initiate it via PHP?

  Read the article

• Using key().id() on GAE Datastore and reverse geocoding

  - by Ivan Slaughter

  I have 6000 data of district, subdistrict. I need to represent this on dependent dropdown. The datamodel is for example; class Location(db.Model): location_name = db.StringProperty() location_parent = db.IntegerProperty() location_parent is reference to key() or id()? Still cannot decide which one is good. When i use key() as reference then using JSON to create jquery dependent drop down. My page loading/query and rendering time the dropdown is quite slow? Can i use key().id() as drop down option value to lighten up the page load? Any better solution for this parent/child reference for the drop down? For example: for the district record/entities the location-parent is null, for sub district record location_name will contain reference to parent district record. Other issue is to reverse geocoding the location to store or display geoPoint (lat,long)? Is google MAP API always find the exact lat,long of specific region boundaries or any error checking for the result?

  Read the article

• Problem with SqlServer 2005 when opening connections

  - by Jose Obregon

  I have a Winforms application and I use EntLib to connect to a SQL Server 2005 DB. The application is working ok, but sometimes, and lately more often, we have started receiving this error from the db when opening the connection: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) The problem is intermittent. The user works well for a couple of hours and then suddenly the exception is thrown. Sometimes it happens when we run a small process that loads a file and then inserts the data to the db.

  Read the article

• How to avoid SQLiteException locking errors

  - by TheArchedOne

  I'm developing an android app. It has multiple threads reading from and writing to the android SQLite db. I am receiving the following error: SQLiteException: error code 5: database is locked I understand the SQLite locks the entire db on inserting/updating, but these errors only seems to happen when inserting/updating while I'm running a select query. The select query returns a cursor which is being left open quite a wile (a few seconds some times) while I iterate over it. If the select query is not running, I never get the locks. I'm surprised that the select could be locking the db.... is this possible, or is something else going on? What's the best way to avoid such locks? Thanks TAO

  Read the article

• Tutorials for C# database app

  - by ChrisC

  My question and comments here http://stackoverflow.com/questions/2471198/what-is-ado-net shows my level of knowledge about c# database apps. Can someone point me to tutorials and/or primers that can help me proceed from where I am (also stated in other question)? I've looked and all I've found are tutorials that talk about general db basics (ie, not helping with VS/C#), or talk about connecting to existing SQL db's. I need help setting one up and configuring it, as well as help on how to create and use queries to test the db schema.

  Read the article

• Problem getting started with GeoDjango

  - by akv

  As soon as I add "from django.contrib.gis.db import models" instead of "from django.db import models", Django stops recognizing the app and gives this error: Error: App with label location could not be found. Are you sure your INSTALLED_APPS setting is correct? The error goes away as soon as I comment out "from django.contrib.gis.db import models"... I have added "django.contrib.gis" and the "location" app to the INSTALLED_APPS setting correctly. Any clues why this is happening? I am running using Django v1.1.1 final, on my windows laptop.

  Read the article

• Read nested Lua table who key is a System.Double

  - by Robert Kerr

  Using C# and LuaInterface, I am trying to read a nested table, but am getting a null LuaTable when I try to open the key containing the table. The .lua file: DB = { ["inventory"] = { [10001] = { ["row"] = 140, ["count"] = 20, }, [10021] = { ["row"] = 83, ["count"] = 3, }, [10075] = { ["row"] = 927, ["count"] = 15, }, } } I can successfully foreach the entries under inventory, by opening that table with: LuaTable tbl = lua.GetTable("DB.inventory"); foreach (DictionaryEntry de in tbl) ... What I cannot do is open an inventory item and enumerate its entries the same way. Is this because the key is a System.Double type? This fails: LuaTable tbl = lua.GetTable("DB.inventory.10001"); foreach (DictionaryEntry de in tbl) with an exception, because tbl is null. Effectively, once I enumerate the keys (inventory items), I then want to drill down into the nested table and work with those contents. As you can see, I am not able to get a reference to the nested table the way I am doing it.

  Read the article

• Idiom vs. pattern

  - by Roger Pate

  In the context of programming, how do idioms differ from patterns? I use the terms interchangeably and normally follow the most popular way I've heard something called, or the way it was called most recently in the current conversation, e.g. "the copy-swap idiom" and "singleton pattern". The best difference I can come up with is code which is meant to be copied almost literally is more often called pattern while code meant to be taken less literally is more often called idiom, but such isn't even always true. This doesn't seem to be more than a stylistic or buzzword difference. Does that match your perception of how the terms are used? Is there a semantic difference?

  Read the article

• Header already sent error in PHP joomla

  - by Leo

  hi all, $dbhost = 'localhost'; $dbuser = 'EhpEngineUser'; $dbpass = 'password'; $conn = mysql_pconnect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql'); $dbname = 'joomladb'; mysql_select_db($dbname); // include 'config.php'; // include 'opendb.php'; above code works fine, if i comment DB connection part and inculde config.db and Opendb, then i get the error as Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\Joomla\Config.php:8) in C:\xampp\htdocs\Joomla\ConfXml.php on line 103 Both file are used for opening DB only. regards, Leo

  Read the article

• how to precompile a jquery ui autocomplete widget?

  - by Alex

  Hello, I have a jquery ui autocomplete widget in a form and I'd like to preselect its value from a database. My autocomplete works in the following way: the id is a number, tha label and the value are the same and are a concatenation of id + " - " + description. When a value from the autocomplete is selected, a hidden field's value is set to the value of id. Then, the hidden field value is saved to the db when the form is submitted. When the user comes back on the page for editing, I need to reload the value from the db: I set the idden field value again and then I would like to precompile the value of the autocomplete widget with the concatenation of id + " - " + description taken form the db. I think I should trigger the event of selecting a row in the autocomplete, but I don't know how to do. Do you have any ideas? Thank you Here is the code of the autocomplete: $('#codice_contratto').autocomplete({ source: 'do_contratto.php', select: function(event, ui) { $('#id_contratto').val(ui.item.id); } });

  Read the article

• ADO.NET Entity Model and LINQ

  - by Richard

  Hi all I'm using an ADO.NET Entity Model which I'm trying to query using LINQ. The problem I'm having is that I can't specify the where clause as I'd like. For instance, consider the following query: AccountsDM db = new AccountsDM(ConfigurationManager.ConnectionStrings["PrimaryEF"].ConnectionString); var accounts = from a in db.Accounts select a; foreach (var account in accounts) { foreach (var ident in account.Identifiers) { if (ident.Identifier == identifier) { // ident.Identifier is what I'd like to be filtering in the WHERE clause below } } } Ideally, I'd like that to become: var accounts = from a in db.Accounts where a.Identifiers.Identifier == identifier select a; I'm guessing I've probably not set up my Entity Model correctly in VS2010. Any advice you can offer would be gratefully received. Thanks, Richard.

  Read the article

• ASP.net MVC - OneToOne relationship with pluralized nomenclature

  - by ludicco

  Hi, I have an OneToOne relationship between my models Account and Company the table names are Accounts and Companies respectively. Here is a brief screenshot of the structure: http://cl.ly/1AEU Everything works well, but mysteriously when I use the OneToOne associations I have accessors like: var db = new DB(); var account = db.Accounts.First(); var company = account.Companies; // note the plural not the singular accessor So, what's happing is that even if using OneToOne association, I still get the plural accessor with "companies" and not "company", if it this is a pure object representation and not an EntitySet generated in case when it s an oneToMany relationship. Is there a way to get this nomenclature to be applied properly? Thanks a lot

  Read the article

• How the return type is determined in a method that uses Linq2Sql?

  - by Richard77

  Hello, I've usually have difficulties with return types when it comes to linq. I'll explain by the following examples. Let's say I have a Table Products with ProductID, Name, Category, and Price as columns : 1) IQueryable<Product public IQueryable<Product> GetChildrenProducts() { return (from pd in db.Products where pd.Category == "Children" select pd); } 2) Product public Product GetProduct(int id) { return (from pd in db.Products where pd.ProductID == id select pd).FirstOrDefault(); } Now, if I decide to select, for instance, only one column (Price or Name) or even 2 or 3 columns (Name and Price), but in any case, less than the 4 columns, what's going to be the return type? I mean this: public returnType GetSomeInformation() { return (from pd in db.Products select new { pd.Name, pd.Price } } What SHOULD BE the returnType for the GetSomeInformation()? Thanks for helping

  Read the article

• Stream (.NET) handling best-practices

  - by Jader Dias

  The question is entitled with the word "Stream" because the question below is a concrete example of a more generic doubt I have about Streams: I have a problem that accepts two solutions and I want to know the best one: I download a file, save it to disk (2 min), read it and write the contents to the DB (+ 2 min). I download a file and write the contents directly to the DB (3 min). If the write to DB fails I'll have to download again in the second case, but not in the first case. Which is best? Which would you use?

  Read the article

• a better way to initialize database ONCE when rail server starts

  - by Hadi

  i would like to initialize database the first time the server is started, that involve calling a class method. Given the class name is: Product At first i put an .rb file config\initializers\init.rb as it gets automatically called. Everything works ok, until the database is deleted, and i am trying to do rake db:migrate. rake db:migrate fails saying that cannot find 'product' table. inside init.rb = Product.populate_db The solution i came up is: I took out init.rb do rake db:migrate put back init.rb run the server. My rails application is mainly for reporting and the data is seeded from other application, so i have to do the above step everyday Is there a better way to do the initialization?

  Read the article

• md5 hash for file without File Attributes

  - by Glennular

  Using the following code to compute MD5 hashs of files: Private _MD5Hash As String Dim md5 As New System.Security.Cryptography.MD5CryptoServiceProvider Dim md5hash() As Byte md5hash = md5.ComputeHash(Me._BinaryData) Me._MD5Hash = ByteArrayToString(md5hash) Private Function ByteArrayToString(ByVal arrInput() As Byte) As String Dim sb As New System.Text.StringBuilder(arrInput.Length * 2) For i As Integer = 0 To arrInput.Length - 1 sb.Append(arrInput(i).ToString("X2")) Next Return sb.ToString().ToLower End Function We are getting different hashes depending on the create-date and modify-date of the file. We are storing the hash and the binary file in a SQL DB. This works fine when we upload the same instance of a file. But when we save a new instance of the file from the DB (with today's date as the create/modify) on the file-system and then check the new hash versus the MD5 stored in the DB they do not match, and therefor fail a duplicate check. How can we check for a file hash excluding the file attributes? or is there a different issue here?

  Read the article

• In Google App Engine, what is the simplest way to keep a record of items that you have put into memc

  - by Chris Boesch

  I am starting to use memcache more frequently to avoid having to recalculate things between page requests. When the memcache periodically clears, as it is designed to do, I have to start all over rebuilding various items that I have placed in memcache. What I would like to do is create a very simple model that enables me to periodically save the items that I put into memcache based on the memcache keys that I'm using along with a datetime that is related to the data being memcached. What is the best way to do this? I'm looking for something like this: class MemcacheRecord(db.Model): key = db.StringProperty(required=True) value = #Something that can store whatever memcache can validThru = db.DateTimeProperty(required=True) def set(self, key, value, validThru): #Save a new memcache record newMemcacheRecord = MemcacheRecord(key=key, value=value, validThru=validThru) .. return True # or False def get_latest(self, key): #Get the memcache record with the most recent validThru datetime latestMemcacheRecord = MemcacheRecord.all().order('-validThru').get() return {'validThru':latestMemcacheRecord.validThru, 'value':latestMemcachRecord.value}

  Read the article

• Matrix Comparison algorithm

  - by SysAdmin

  If you have 2 Matrices of dimensions N*M. what is the best way to get the difference Rect? Example: 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 4 5 4 3 2 3 <---> 2 3 2 3 2 3 2 3 2 3 4 5 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 2 3 | | \ / Rect([2,2] , [3,4]) 4 5 4 4 5 2-> A (2 x 3 Matrix) The best I could think of is to scan from Top-Left hit the point where there is difference. Then scan from Bottom Right and hit the point where there is a difference. But In worst case, this is O(N*M). is there a better efficient algorithm?

  Read the article

• perl debugger freezes

  - by vbNewbie

  First time perl user and I am trying to debug some script to follow project logic and of course syntax. Using cygwin after entering $perl -d sample.pl Loading DB routines from perl5db.pl version 1.3 Editor support available. Enter h or h h' for help, orperldoc perldebug' for more help. main::(sample2.pl:7): looper(); DB<1 It hangs at the DB<1 line. I cannot enter anything at the prompt. Is there a reason why this post is inappropriate? or how is this not clear?

  Read the article

• Liqn to sql null-able value in query

  - by msony

  I need get all items what have no categories int? categoryId = null; var items=db.Items.Where(x=>x.CategoryId==categoryId); this code generate in where: where CategoryId=null instead of where CategoryId is null ok, when i write var items=db.Items.Where(x=>x.CategoryId==null); in my sql profiler it works: where CategoryId is null BUT when i do this HACK it doesn't: var items=db.Items.Where(x=>x.CategoryId==(categoryId.HasValue ? categoryId : null)); so what's the problem? is there by in L2S?

  Read the article

• Having difficulty in mapreduce to understand

  - by mahesh

  Hi all, I have seen the below link which is of getting started mapreduce with python http://code.google.com/p/appengine-mapreduce/wiki/GettingStartedInPython But still I am not able to understand how its working. I am executing below code but not able to understand what exactly is happening? mapreduce.yaml mapreduce: - name: Testmapper mapper: input_reader: mapreduce.input_readers.DatastoreInputReader handler: main.process params: - name: entity_kind default: main.userDetail mapreduce/main.py #some code class userDetail(db.Model): name = db.StringProperty() #some code def process(u): u.name="mahesh" yield op.db.Put(u) I am executing this and it gives me status = success in status page. But not able to understand what happend The main thing I want do with mapreduce is to search or count records from entity So anyone can please help me?? Thanks in advance

  Read the article

• Connecting to multiple firebird Databases via Delphi

  - by Branden

  I am integrating a system with 2 other applications, 1 using a Firebird database whilst the other BIS (using ADO). My delphi application uses Firebird. I need to read data from my database, insert it into both the BIS database and the other application firebird database. I have created seperate data modules for each. Sending data to the ADO works fine, but when writing to the other Firebird DB (my db still open) I get strange errors. I have managed to isolate the problem to the second firebird DB. Small data writes seems fine. The data structures are completly different, so un able to use a synch tool. is there a way to overcome this by using multi threading or seperate memory space each Firebird instance uses?

  Read the article

< Previous Page | 304 305 306 307 308 309 310 311 312 313 314 315  | Next Page >