Store/retrieve Millions Of Files When Their Meta-data Is In A SQL Database?
Aug 10, 2009
I have a process that's going to initially generate 3-4 million PDF files, and continue at the rate of 80K/day. They'll be pretty small (50K) each, but what I'm worried about is how to manage the total mass of files I'm generating for easy lookup. Some details:
I'll have some other steps to run once a file have been generated, and there will be a few servers participating, so I'll need to watch for files as they're generated.Once generated, the files will be available though a lookup process I've written. Essentially, I'll need to pull them based on an order number, which is unique per file.At any time, an existing order number may be resubmitted, and the generated file will need to overwrite the original copy.
Originally, I had planned to write these files all to a single directory on a NAS, but I realize this might not be a good idea, since there are millions of them and Windows might not handle a million-file-lookup very gracefully. I'm looking for some advice:
Is a single folder okay? The files will never be listed - they'll only be retrieved using a System.IO.File with a filename I've already determined.If I do a folder, can I watch for new files with a System.IO.DirectoryWatcher, even with that many files, or will it start to become sluggish with that many files?Should they be stored as BLOBs in a SQL Server database instead? Since I'll need to retrieve them by a reference value, maybe this makes more sense.
If you have to store and retrieve data from a database is a string not the most effcient way? What is best?
How does this work in a real world scenario.
For example: I have a customer ie first name and last name and the CustomerID is autoincremented when initially added to the database. Now, the user could lookup and find the customer by their ID but we all know that's not practical. They don't know 231223 is John Adams, they know John Adams or Adams John.
So how do you handle this? Access is the database I am using but I think this would apply to any database.
I'm trying to store and retrieve PDF files using SQL server 2008 and Visual Basic 2010.The Issue:i need to lookup a PDF file and store it to the DB using filestream and display it in Adobe Acrobat COM Control on VB Form?
My application needs to collect a list of all telephone numbers from a table in the company database. Running a COUNT on the amount of records that my SQL Query to get this information returns a total of 9,430,138 records. I've tried selecting DISTINCT values,but that doesn't even cut the count by 200 rows.The application needs to store this information in a .dat file that it will create after populating a DataSet. Unfortunately the CPU and Memory impact for this operation make this import literally painful. CPU shoots up to 100% and memory usage which, on this system, normally holds steady at 413mb during normal operation exceeded 1gb usage yesterday when I tested for the first time..Obviously, this is far too much for a single application to use during operation. I have no problem with the import taking a reasonably long time because this import is basically just a "snapshot" of the data. The data in the database shouldn't change very regularly, so I figure an import like this once every 2 months should suffice.
My problem is the amount of system resources this operation uses. How can I streamline it to minimize the impact it has? I'm OK with running multiple smaller queries to collect the information from the database, but don't know how to go about it.I executed the query live on the database, and it gets to around 6.5m rows before an OutOfMemoryException is thrown
SQL Server supports the ability for clients to store objects within tables.Create Field that data type Image and Initialize byte array with a null value initially.Use FileInfo object to get file size.Open FileStream to read file.Use
store and retrieve image in a SQL Server database with vb.net.:Well, the application in vb.net seems to have a database which can accessed by the LAN computers so the SQL Server 2005 database allows remote computers to share its database once the other computer application requests database from the server.So, every other computer has to store and retrieve images in SQL Server 2005. For example, comp1 has to store images taken into the server and retrieve it like tableadapter.
I am using bindings and tableadapters to store the details in database and retrieving information from db. Please if you have code or anything which is working for me, please post it here... how to store image and retrieve it SQL Server through vb.net provided there's LAN computers who are also sharing the SQL Server database.
code on storing path image and retrieve path into image using mysql database and vb.net/vs 2008. I only know how to make a browse button and get the image into hard disk and display it in picturebox. I'm done with the the problem is how to store the path and retrieve the path into image.
I like the PHP way of doing things but, it seems I am stuck with using a Collection of Object's to store/retrieve the data I need. I have my Collection loaded with my Objects's and the code to iterate through the collection, my problem is I am unable to retrieve the "key" as it would be called in PHP (I believe in this case it is actually the name of the object).
Consider the following example:
Dim xDoc As XPathDocument = New XPathDocument(fName) Dim xNav As XPathNavigator = xDoc.CreateNavigator()
Dim sender As XPathNodeIterator
[CODE]...
As you can see, I am navigating an XML document, and creating an Object with some Key/Value pairs. The Object would look something like this if it were in JSON:
When I iterate though the Collection I can only get the value of the object, but I need the Key, in this instance I want "name","address1","city","state" to be stored in a variable for each iteration.
I need to store/retrieve a bit from a data table of 3.268.760 bits long.
Using w As New BinaryWriter(File.Open("test.bin", FileMode.Create)) for x = 1 to 3268760 For i = 1 To 3268760[code]....
the w.write(?) stores a boolean value meaning 0/1 for false/true values, but Vb.net seems to use an whole byte to store this data which is too expensive for my table (3.268.760^2).Is there a pratical way to store/retrive single bits from a file using vb.net? (meaning as little as possible conversion to other types).
I'm trying to build something called a structure which will store data it retrieves from a text file. I have the structure set up like this: Structure Employee Dim FirstName As String Dim LastName As String Dim ID As String Dim Hours As Integer Dim Wage As Decimal Dim EarnedPay As Decimal End Structure [Code] ..... How to set these operations up?
We're making a project named personal digital library. It works like an automatic file organizer, which organizes files accdg to different topics, which falls under document categorization. The problem is we don't know what algorithm will be used in our project, we're using VB.NET 2008. Another is do we need to create a database to store the files to be organized?
We are trying to retrieve PDF files stored in a SQL Database. We want to display them on a web page. We are using VB and ASP Code within Visual Studio 2008. We have found snippets of code, but because we are new it does not make sense to us. We are looking for infomation on how to retrieve the PDF from the database and either display directly to a web page, or write the information to a Temporary PDF file we can delete later.
I have determined thanks to the last q & a that there is something wrong with my "save to db" code as well as my "retrieve to picture" code. Even If I manually save the pic in the db it stil wont retreive. This is code i patched together from 3 or 4 examples around the net.
Dim filename As String = txtName.Text + ".jpg" Dim FileSize As UInt32 Dim ImageStream As System.IO.MemoryStream[code]......
how i need to store data to the program files directory, but i couldnt becuase it required adminstrator privileges. After searching around i found an appdata folder with the path "C:UsersCristian RiveraAppDataLocalVirtualStoreProgram
[Code]....
how to download folders and i know how to search for folders but how can i download a folder into the above directories without knowing the name of the user account.
Does anyone know how to get the width and depth out of a swf file? Sounded easy when I started looking but I caould only find samples for VB6 and not .net
I want to decorate a VB.NET class with meta data to describe additional information associated with the properties of the class. Also I need this information to be visible through reflelction.Is this even possible for me to accomplish?
I have a report made in Crystal Reports XI. The report is generated and exported to PDF in visual basic script using COM interface. Generally everything is running smoothly, but in one case generation breaks with error: Failed to retrieve data from the database. Details: [Database Vendor Code 9421]
Database used is MSSQL 2005 connected over ODBC to CR XI. When I am opening report with exactly the same parameters in Designer, everything works fine.It looks like it is data related, but it is hard to trace since the whole report is pretty sophisticated. Anyway I spent half a day on crawling over Dr. Google and it seems that he has no clue what might be an issue.
Ive come up with an issue in a program im making, hoping someone might have a clue. Basically I want to enable meta gaming into a ORPG I play. Obtaining all the meta gaming was easy enougth to do, now I have to add it into the game (Microsoft Freelancer) But ive run into a problem.I don't have a clue how. Basically, Microsoft Freelancer has a "chatbox" and I want to pass skype to and from the chatbox using VB.So if I want to type "Hi everyone" into skype, I would type "/s Hi everyone" and theoretically my VB app catches the message and passes it to skype.I can do that part using windows hooks. But when skype chats back, How to post into the game?Ive run a sniffer, But I get data that I have no Idea what it is.0000 80 06 01 00 CD DE 00 00 93 F5 06 00 I do know the ip im sending to and the port, If that helps, And the rest of the program functions, just sending and receiving the chat data is beyond me atm.
For including images in my database, what i would like to do during the import process is capture some of the meta data to store against fields in my database as well.
In this case we will be using iPhone 4s which i believe capture data in EXIF format.
I did a bit of looking around on my own and apart from: [url]
I have three tables in SQL server which I would like to show and access on a form. Table 1 contains account data, address, contact details etc. Table two contains data attached to a Person, tel no , Mobile no, Email etc. Table three contains details on what awards the person holds, i.e. one person can hold several awards.
Therefore I have a one many relationship between the first two tables and a one many relationship between the second two tables. This is set up in SQL
The first two tables are shown on a form, table 1 via a set of text boxes, table 2 via a datagrid control.
I would like the functionality whereby I could select a row in the datagrid showing the persons name and find the Persons_ID number then use that as a filter to a second datagrid view so that only the selected persons awards show in the datagrid.
I wish to create a visual basic asp.net web application which can store data, entered by the user via a textbox to a database, once the STORE button has been clicked. I also want to be able to view the stored data by clicking VIEW STORED DATA.I am using visual studio and I am a complete beginner. I need to know how to create an appropriate database and how to link it to my web application.
best way to store the data for a .net database and the reasons why. Please note I would like to have access to the database from a blackberry and the option for multiple applications to read & write to the database at the same time.
I am using an Access database and vb.net 2010. I have created a table in the database with columns for title, datein, dateout and roomnymber. In vb.net 2010 I made a distinguished title = combobox, datein and dateout = DateTimePicker. When I click on F5, an error occurs: INSERT INTO Syntax Error in statement. Here's my code:
Dim sql As String sql = "INSERT INTO tcekin(title,firstname,lastname,address,country,company,roomnumber,datein,dateout,rommtype,note)" & "VALUES('" & ComboBox1.Text & _
I Need to Store bunch of Jpeg files from local file system to a column with image datatype in databse.Can any one please provide me some code to do it?
we want to retrieve all data in our database but we dont know how to do it.. hmm.. we just use to retrieve data one by one.. its just by the search button.
