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  • System Requirements of a write-heavy applications serving hundreds of requests per second

    - by Rolando Cruz
    NOTE: I am a self-taught PHP developer who has little to none experience managing web and database servers. I am about to write a web-based attendance system for a very large userbase. I expect around 1000 to 1500 users logged-in at the same time making at least 1 request every 10 seconds or so for a span of 30 minutes a day, 3 times a week. So it's more or less 100 requests per second, or at the very worst 1000 requests in a second (average of 16 concurrent requests? But it could be higher given the short timeframe that users will make these requests. crosses fingers to avoid 100 concurrent requests). I expect two types of transactions, a local (not referring to a local network) and a foreign transaction. local transactions basically download userdata in their locality and cache it for 1 - 2 weeks. Attendance equests will probably be two numeric strings only: userid and eventid. foreign transactions are for attendance of those do not belong in the current locality. This will pass in the following data instead: (numeric) locality_id, (string) full_name. Both requests are done in Ajax so no HTML data included, only JSON. Both type of requests expect at the very least a single numeric response from the server. I think there will be a 50-50 split on the frequency of local and foreign transactions, but there's only a few bytes of difference anyways in the sizes of these transactions. As of this moment the userid may only reach 6 digits and eventid are 4 to 5-digit integers too. I expect my users table to have at least 400k rows, and the event table to have as many as 10k rows, a locality table with at least 1500 rows, and my main attendance table to increase by 400k rows (based on the number of users in the users table) a day for 3 days a week (1.2M rows a week). For me, this sounds big. But is this really that big? Or can this be handled by a single server (not sure about the server specs yet since I'll probably avail of a VPS from ServInt or others)? I tried to read on multiple server setups Heatbeat, DRBD, master-slave setups. But I wonder if they're really necessary. the users table will add around 500 1k rows a week. If this can't be handled by a single server, then if I am to choose a MySQL replication topology, what would be the best setup for this case? Sorry, if I sound vague or the question is too wide. I just don't know what to ask or what do you want to know at this point.

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  • How to diagnose causes of oom-killer killing processes

    - by dunxd
    I have a small virtual private server running CentOS and www/mail/db, which has recently had a couple of incidents where the web server and ssh became unresponsive. Looking at the logs, I saw that oom-killer had killed these processes, possibly due to running out of memory and swap. Can anyone give me some pointers at how to diagnose what may have caused the most recent incident? Is it likely the first process killed? Where else should I be looking?

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  • Resources for SQL Server programming?

    - by Undh
    I have tried to search from the web resources for SQL Server programming. Basically I'm trying to search good tutorial for programming SQL Server (creating procedures, triggers, cursors etc.). Can you give some helping hand and show some links for good tutorials?

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  • Can not access IIS7 website externally - but can locally

    - by mactruck
    I have 2 websites, site A running on port 80 and site B configured to run on port 8080. I can access site A no problem, but site B I can only access from the local web server machine. Externally it is not accessable, I have tried the url and ip and neither work. I have tried different configuring on port 8081 as a test and that didnt work either. What IIS settings should I look at?

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  • How can I connect to weblogic JMX via an SSH tunnel?

    - by Zubair
    I am trying to connect to weblogic via an SSH tunnel. When I connect to the web interface it works fine, but when I try to connect via JMX I get the message: javax.naming.CommunicationException [Root exception is java.net.ConnectException: t3://127.0.0.1:7001: Bootstrap to 127.0.0.1/127.0.0.1:7001 failed. It is likely that the remote side declared peer gone on this JVM] Does anyone know what this means?

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  • Apache 2.2.14: SSLCARevocation location

    - by Doc
    I am installing a .crl in my apache config. It looks like this: VirtualHost default DocumentRoot "web" ServerName example.com SSLEngine on SSLCertificateFile "cert.crt" SSLCertificateKeyFile "key.key" SSLCertificateChainFile "cert.ca-bundle" SSLProtocol -all +SSLv3 SSLCipherSuite SSLv3:+HIGH:+MEDIUM Directory Order deny,allow Allow from all SSLCACertificateFile "ClientRootCert.crt" SSLVerifyClient require SSLVerifyDepth 3 SSLCARevocationFile "CRLList.crl" Directory VirtualHost When Apache is started, I get the error: SSLCARevocationFile not allowed here When I place SSLCARevocationFile above the Directory tag, Apache starts, but all client certs are rejected with the message: ssl_error_expired_cert_alert (both revoked and active certs) How to solve this?

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  • Windows Server 2008 IIS

    - by Tone
    I'm trying to do a really simple task - setup a virtual directory in Windows Server 2008. This is what I am doing but it's not working for some reason: Open IIS 7 Create a new virtual directory in Default Web Site and point it to a folder on d:\ drive Browse to folder on d:\ drive and create an .htm file with some test text in it Open a browser and navigate to http://localhost/TestSite/index.htm But I get a 404 - what gives? Edit:I didn't mention at first that this is Server 2008 R2

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  • Two-way databinding of a custom templated asp.net control

    - by Jason
    I hate long code snippets and I'm sorry about this one, but it turns out that this asp.net stuff can't get much shorter and it's so specific that I haven't been able to generalize it without a full code listing. I just want simple two-way, declarative, edit-only databinding to a single instance of an object. Not a list of objects of a type with a bunch of NotImplementedExceptions for Add, Delete, and Select, but just a single view-state persisted object. This is certainly something that can be done but I've struggled with an implementation for years. This newest, closest implementation was inspired by this article from 4-Guys-From-Rolla. Unfortunately, after implementing, I'm getting the following error and I don't know what I'm missing: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. If I don't use Bind(), and only use Eval() functionality, it works. In that way, the error is especially confusing. Update: Actually, using Eval() does NOT work, but using <%# Container.SampleString %> works. However, Eval("SampleString") gives the same error. That leads me back to this article I found earlier but had discarded. Now I believe it might be related, though I haven't cracked it yet ... Here's the simplified codeset that still produces the error: using System.ComponentModel; namespace System.Web.UI.WebControls.Special { public class SampleFormData { public string SampleString = "Sample String Data"; public int SampleInt = -1; } [ToolboxItem(false)] public class SampleSpecificFormDataContainer : DataBoundControl, INamingContainer { SampleSpecificEntryForm entryForm; internal SampleSpecificEntryForm EntryForm { get { return entryForm; } } [Bindable(true), Category("Data")] public string SampleString { get { return entryForm.FormData.SampleString; } set { entryForm.FormData.SampleString = value; } } [Bindable(true), Category("Data")] public int SampleInt { get { return entryForm.FormData.SampleInt; } set { entryForm.FormData.SampleInt = value; } } internal SampleSpecificFormDataContainer(SampleSpecificEntryForm entryForm) { this.entryForm = entryForm; } } public class SampleSpecificEntryForm : WebControl, INamingContainer { #region Template private IBindableTemplate formTemplate = null; [Browsable(false), DefaultValue(null), TemplateContainer(typeof(SampleSpecificFormDataContainer), ComponentModel.BindingDirection.TwoWay), PersistenceMode(PersistenceMode.InnerProperty)] public virtual IBindableTemplate FormTemplate { get { return formTemplate; } set { formTemplate = value; } } #endregion #region Viewstate SampleFormData FormDataVS { get { return (ViewState["FormData"] as SampleFormData) ?? new SampleFormData(); } set { ViewState["FormData"] = value; SaveViewState(); } } #endregion public override ControlCollection Controls { get { EnsureChildControls(); return base.Controls; } } private SampleSpecificFormDataContainer formDataContainer = null; [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public SampleSpecificFormDataContainer FormDataContainer { get { EnsureChildControls(); return formDataContainer; } } [Bindable(true), Browsable(false)] public SampleFormData FormData { get { return FormDataVS; } set { FormDataVS = value; } } protected override void CreateChildControls() { if (!this.ChildControlsCreated) { Controls.Clear(); formDataContainer = new SampleSpecificFormDataContainer(this); Controls.Add(formDataContainer); FormTemplate.InstantiateIn(formDataContainer); this.ChildControlsCreated = true; } } public override void DataBind() { CreateChildControls(); base.DataBind(); } } } With an ASP.NET page the following: <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default2.aspx.cs" Inherits="EntryFormTest._Default2" EnableEventValidation="false" %> <%@ Register Assembly="EntryForm" Namespace="System.Web.UI.WebControls.Special" TagPrefix="cc1" %> <asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"> </asp:Content> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <h2> Welcome to ASP.NET! </h2> <cc1:SampleSpecificEntryForm ID="EntryForm1" runat="server"> <FormTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SampleString") %>'></asp:TextBox><br /> <h3>(<%# Container.SampleString %>)</h3><br /> <asp:Button ID="Button1" runat="server" Text="Button" /> </FormTemplate> </cc1:SampleSpecificEntryForm> </asp:Content> Default2.aspx.cs using System; namespace EntryFormTest { public partial class _Default2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { EntryForm1.DataBind(); } } } Thanks for any help!

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  • Telnet or SSH to Embedded Linux based NAS?

    - by ef2011
    Do you happen to know whether it is possible to telnet or SSH to LG N1A1DD1 NAS? It seems to have lots of features that I don't need (including FTP) but I couldn't find any mention of the ability to telnet or SSH to it. If telneting or SSH-ing to it isn't possible, do you know whether it is possible to configure via its web interface a script that can periodically back it up via its USB port? (while still functioning as NAS, of course)

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  • How to use AIM to communicate with a Google Talk user?

    - by altendky
    How do I allow someone that uses the AIM desktop client to chat with someone else using the Google Talk desktop client? Both systems are Windows XP. The trick is that I don't want to have them have to change clients. Long ago I used Trillian... then Pidgin and now Meebo. But these are not solutions to the question. Also note that the Google client is not the web gadget.

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  • Does Windows performance degrade past a certain level of CPU utilization?

    - by Mike Taylor
    Is there a recommended average CPU threshold in running Windows boxes based on experience in other shops? Background: We are running with Windows Server 2003 32-bit OS. Servers are handling a major enterprise-level web application suite with a high frequency of small transactions mixed in with much larger transactions - overall average is 13ms. Our average overall CPU utilization of the Windows servers are ~60% during prime-shift. And we question at what level does the Windows OS begin to shimmy on the CPU scheduling road? Thanks.

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  • How decode xfs lost+found directory

    - by Satpal
    I have managed to trash my homebrew Nas box (an old hp d530 + 2x 750gb sata soft raid1 + 17gb boot disk with ubuntu server 8.10) I have searched the web and tried to repair the file system but to no avail :( I was thinking that the dirs/files located under the root of the lost+found directory are 64 bit numbers. Is there any way that I could decant the number into binary form, from there reconstruct the directory/file structure. More to the point can anyone point to the information on how xfs inodes are broken down(does that make sense)?

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  • Wisdom of merging 100s of Oracle instances into one instance

    - by hoytster
    Our application runs on the web, is mostly an inquiry tool, does some transactions. We host the Oracle database. The app has always had a different instance of Oracle for each customer. A customer is a company which pays us to provide our service to the company's employees, typically 10,000-25,000 employees per customer. We do a major release every few years, and migrating to that new release is challenging: we might have a team at the customer site for a couple weeks, explaining new functionality and setting up the driving data to suit that customer. We're considering going multi-client, putting all our customers into a single shared Oracle 11g instance on a big honkin' Windows Server 2008 server -- in order to reduce costs. I'm wondering if that's advisable. There are some advantages to having separate instances for each customer. Tell me if these are bogus, please. In my rough guess about decreasing importance: Our customers MyCorp and YourCo can be migrated separately when breaking changes are made to the schema. (With multi-client, we'd be migrating 300+ customers overnight!?!) MyCorp's data can be easily backed up and (!!!) restored, without affecting other customers. MyCorp's data is securely separated from their competitor YourCo's data, without depending on developers to get the code right and/or DBAs getting the configuration right. Performance is better because the database is smaller (5,000 vs 2,000,000 rows in ~50 tables). If MyCorp's offices are (mostly) in just one region, then the MyCorp's instance can be geographically co-located there, so network lag doesn't hurt performance. We can provide better service to global clients, for the same reason. In MyCorp wants to take their database in-house, then we can easily export their instance, to get MyCorp their data. Load-balancing is easier because instances can be placed on different servers (this is with a web farm). When a DEV or QA instance is needed, it's easier to clone the real instance and anonymize the data, because there's much less data. Because they're small enough, developers can have their own instance running locally, so they can work on code while waiting at the airport and while in-flight, without fighting VPN hassles. Q1: What are other advantages of separate instances? We are contemplating changing the database schema and merging all of our customers into one Oracle instance, running on one hefty server. Here are advantages of the multi-client instance approach, most important first (my WAG). Please snipe if these are bogus: Less work for the DBAs, since they only need to maintain one instance instead of hundreds. Less DBA work translates to cheaper, our main motive for this change. With just one instance, the DBAs can do a better job of optimizing performance. They'll have time to add appropriate indexes and review our SQL. It will be easier for developers to debug & enhance the application, because there is only one schema and one app (there might be dozens of schema versions if there are hundreds of instances, with a different version of the app for each version of the schema). This reduces costs too. The alternative is having to start every debug session with (1) What version is this customer running and (2) Let's struggle to recreate the corresponding development environment, code and database. (We need a Virtual Machine that includes the code AND database instance for each patch and release!) Licensing Oracle is cheaper because it's priced per server irrespective of heft (or something -- I don't know anything about the subject). The database becomes a viable persistent store for web session data, because there is just one instance. Some database operations are easier with one multi-client instance, like finding a participant when they're hazy about which customer they (or their spouse, maybe) works for: all the names are in one table. Reporting across customers is straightforward. Q2: What are other advantages of having multiple clients in one instance? Q3: Which approach do you think is better (why)? Instance per customer, or all customers in one instance? I'm concerned that having one multi-client instance makes migration near-impossible, and that's a deal killer... ... unless there is a compromise solution like having two multi-client instances, the old and the new. In that case case, we would design cross-instance solutions for finding participants, reporting, etc. so customers could go from one multi-client instance to the next without anything breaking. THANKS SO MUCH for your collective advice! This issue is beyond me -- but not beyond the collective you. :) Hoytster

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  • Cool features of Macs / OS X?

    - by Click Upvote
    I found out yesterday that you can use a remote control with a Mac. And I've also heard that iSight web cams can be programmed to detect any kind of movements? What are some other cool/interesting features that a user new to Macs wouldn't likely know about?

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  • Graphite Integration breaks ganglia/gmetad?

    - by Falk Stern
    I'm trying to forward metrics from gmetad to graphite/carbon. After configuring carbon_server and ganglia_prefix in gmetad.conf gmetad starts losing metrics. gmetad Version is 3.3.5, carbon/whisper/graphite-web is 0.9.8. There is no I/O bottleneck on the system and no CPU bottleneck (HP DL385G7 with 2 SSDs in RAID0), I even configured another gmetad on a remote host to send metrics to graphite/carbon, which also broke down. Does anyone else experience this?

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  • Better graphics or better cpu on a budget laptop.

    - by jones
    Which would have better overall performance on a cheap (~$600) laptop; Intel Atom 330 with Nvidia ion or intel Pentium/Celeron with Intel graphics. I don't need 8 hour battery life and will hopefully be using this for programming/web browsing and occasionally light gaming.

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  • What is the syntax for combining Word field codes?

    - by MADCookie
    I want to create a hyperlink to the location of my Word document. The document is on an web server so its path is like http://myserver.com/folder/worddocument.docx. I can use the field code "FILENAME" and the field code "HYPERLINK", but I can't figure out how to use them together. File name: { FILENAME \* Lower \p \* MERGERFORMAT } Hyperlink: { HYPERLINK "http://myserver.com/folder/worddocument.docx" }

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