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  • optimizing any OS for maximum informix client/server performance

    - by Frank Developer
    Is there any Informix documentation for optimizing any operating system where an ifx engine is running? For example, in Linux, strip-down to a bare minimum all unnecessary binaries, daemons, utilities, tune kernel parameters, optimize raw and cooked devices (hdparm), place swap space on beginning tracks of a disk, etc. Someday, maybe, Informix can create its own proprietary and dedicated PICK-like O/S to provide the most optimized environment for a standalone ifx server? The general idea is for the OS where ifx sits on have the smallest footprint and lowest overhead impact.

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  • Database indexes and their Big-O notation

    - by miket2e
    I'm trying to understand the performance of database indexes in terms of Big-O notation. Without knowing much about it, I would guess that: Querying on a primary key or unique index will give you a O(1) lookup time. Querying on a non-unique index will also give a O(1) time, albeit maybe the '1' is slower than for the unique index (?) Querying on a column without an index will give a O(N) lookup time (full table scan). Is this generally correct ? Will querying on a primary key ever give worse performance than O(1) ? My specific concern is for SQLite, but I'd be interested in knowing to what extent this varies between different databases too.

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  • How to skip extra lines before the header of a tab delimited delimited file in R

    - by Michael Dunn
    The software I am using produces log files with a variable number of lines of summary information followed by lots of tab delimited data. I am trying to write a function that will read the data from these log files into a data frame ignoring the summary information. The summary information never contains a tab, so the following function works: read.parameters <- function(file.name, ...){ lines <- scan("tmp.log", what="character", sep="\n") first.line <- min(grep("\\t", lines)) return(read.delim(file.name, skip=first.line-1, ...)) } However, these logfiles are quite big, and so reading the file twice is very slow. Surely there is a better way?

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  • Storing and managing video files

    - by Ajay
    What approach is considered to be the best to store and manage video files? As databases are used for small textual data, are databases good enough to handle huge amounts of video/audio data? Are databases, the formidable solution? Apart from size of hard disk space required for centrally managing video/audio/image content, what are the requirements of hosting such a server?

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  • Insufficient memory to continue the execution of the program

    - by Suman
    My Application (Vb.net, Access 2003/2007) is to scan Access Database files for activex controls and to generate report accordingly. Problem: Getting an error like: "Insufficient memory to continue the execution of the program." The above error occurs while scanning for older version of Access files like prior to office 2000. And the line of code where I get this is as follows: Dim oForm As Access.Form Dim oAccess as Access.Application oForm = oAccess.Forms(objForms.Name) But it opens the file and form as well. Need Help: Whether it is possible to read the file (Access Forms and Reports) or not? Please provide me reference or any solution.

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  • Visual Studio: Where are global settings stored?

    - by Philipp
    Hi, sometimes after logging out and in again, my settings in Tools/Options/Projects and Solutions/VC++ Directories are lost. To investigate the problem I tried to find the file where Visual Studio (2008 Team) stores those settings on disk. (Or is it in the registry?) Can anybody point me to where it is? Thanks a lot!

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  • Hibernate configuration - session factory scanning?

    - by Marcus
    We have this hibernate.cfg.xml file. Is there a way to tell Hibernate to just scan a directory instead of having to add an entry here for each class? <hibernate-configuration> <session-factory> <mapping class="com.abc.domain.model.A" /> <mapping class="com.abc.domain.model.B" /> <mapping class="com.abc.domain.model.C" /> <mapping class="com.abc.domain.model.D" /> <mapping class="com.abc.domain.model.E" /> </session-factory> </hibernate-configuration>

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  • numerical computation locks up ruby

    - by kolosy
    i'm trying to implement an id obfuscation scheme, with a simple hash borrowed elsewhere. i've added a method on the application helper: @@M_ID = 2**31-1 @@PRIME = 1580030173 @@PRIME_INVERSE = 59260789 # (calculated from MAXID and PRIME offline) def obfuscate_id(x) if x return ((x * @@PRIME) & @@M_ID) else x end end for some reason, whenever this is called, ruby locks up, and starts eating up disk space on my mac... like - gigs of it. any ideas?

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  • How can I Monitor the Performance of Individual Apps on Windows?

    My XP machine has become terribly slow and I want to identify the application at fault. It seems to be related to disk access rather than processor hogging. I can look at the task manager to get a good idea but it's not ideal. I was wondering if there was some application that can monitor all aspects of processes effectively. Is Process Explorer my only hope?

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  • Set both Text and Value property of ComboBox in design time

    - by The King
    I need to add the following items to a combo box. Value DisplayText Mpost Posted Call Calling RScan Re-Scan These items are fairly static, and is not retrieved from any database... Hence thought of assigning these in design time itself. I'm Unable to use Items property as it asks only one value per item... Could you please help. Ps : In case you are suggesting BindingSource, could you please give me an example. I was not able to find one.

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  • Where are global settings stored?

    - by Philipp
    Hi, sometimes after logging out and in again, my settings in Tools/Options/Projects and Solutions/VC++ Directories are lost. To investigate the problem I tried to find the file where Visual Studio (2008 Team) stores those settings on disk. (Or is it in the registry?) Can anybody point me to where it is? Thanks a lot!

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  • How can the AssemblyName class be used for existing Assembly's?

    - by IbrarMumtaz
    This is another exam related question. I want to know how can I use the AssemblyName class to represent an existing assembly that already exists on disk??? I am talking about from the perspective of using the AppDomain's instance method .Load(), that takes an AssemblyName object as a parameter. I know what MSDN has to say about what the .Load() method was designed for but that aside, I still want to know how to use it !!!

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  • Cocoa equivalent of diskEvt/kEventClassVolume?

    - by tewha
    We have a drop-down menu of volumes in our UI, and I'd like to update it when a new disk is mounted. In the Classic days, this would involve watching for a diskEvt event. In Carbon, I think this was kEventClassVolume. What's the Cocoa equivalent? (A pointer into Apple's documentation on this would satisfy the question. I've been unable to find anything!)

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  • Can a repeated piece of regular expression create multiple groups? Such as this example...

    - by Yousui
    Hi guys, I'm using RUBY 's regular expression to deal with text such as ${1:aaa|bbbb} ${233:aaa | bbbb | ccc ccccc } ${34: aaa | bbbb | cccccccc |d} ${343: aaa | bbbb | cccccccc |dddddd ddddddddd} ${3443:a aa|bbbb|cccccccc|d} ${353:aa a| b b b b | c c c c c c c c | dddddd} I want to get the trimed text between each pipe line. For example, for the first line of my upper example, I want to get the result aaa and bbbb, for the second line, I want aaa, bbbb and ccc ccccc. Now I have wrote a piece of regular expression and a piece of ruby code to test it: array = "${33:aaa|bbbb|cccccccc}".scan(/\$\{\s*(\d+)\s*:(\s*[^\|]+\s*)(?:\|(\s*[^\|]+\s*))+\}/) puts array Now my problem is the (?:\|(\s*[^\|]+\s*))+ part can't create multiple groups. I don't know how to solve this problem, because the number of text I need in each line is variable. Anyone can help? Great thanks.

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  • Why is doing a top(1) on an indexed column in SQL Server slow?

    - by reinier
    I'm puzzled by the following. I have a DB with around 10 million rows, and (among other indices) on 1 column (campaignid_int) is an index. Now I have 700k rows where the campaignid is indeed 3835 For all these rows, the connectionid is the same. I just want to find out this connectionid. use messaging_db; SELECT TOP (1) connectionid FROM outgoing_messages WITH (NOLOCK) WHERE (campaignid_int = 3835) Now this query takes approx 30 seconds to perform! I (with my small db knowledge) would expect that it would take any of the rows, and return me that connectionid If I test this same query for a campaign which only has 1 entry, it goes really fast. So the index works. How would I tackle this and why does this not work? edit: estimated execution plan: select (0%) - top (0%) - clustered index scan (100%)

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  • How to make NetBeans IDE 6.8 show svn commit status (especially for "dirty" files)

    - by Andrew M. Andrews III
    I just switched from Eclipse to NetBeans IDE 6.8 for my PHP/Ajax development. Eclipse always showed a little hard disk symbol over the file icon for files that were in sync with the svn repository, and an asterisk for files with changes that have not been committed. Is there a way to see the commit status in NetBeans? If not, what is your preferred way of recognizing which files to commit?

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  • JBoss 4.2.3 Servlet API 2.5 JSF 2.0 Hibernate 3.0 Support Added [Solved]

    - by AZ_
    While deploying my project on Redhat 6 with Jboss 4.2.3 I was having following difficulties so I decided to put it on stackoverflow so that it can help other people. If anyone could suggest a good title so that it can easily be searched, please Q: How to make Jboss 4.2.x to ignore old JSF libraries and use one within your project libs? Q: How to make Jboss scan specific path for WAR file scanning? Q: How to bind Jboss with IP address rather then localhost? Q: Where Jboss put exploded WAR file? Q: Hibernate-annotations conflict with Jboss 4.2.3 annotations and throwing following Exception. java.lang.ClassCastException: org.hibernate.validator.event.ValidateEventListener cannot be cast to org.hibernate.event.PreInsertEventListener Q: How to run JSF 2.0.x on JBoss 4.0.x ? As JSF 2.0 supports at least Servlet 2.5 API and JBoss has Tomcat 5.x that can support Servlet 2.4 at max. Q: How to change Servlet version of a Dynamic Web Project?

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  • How to increase query speed without using full-text search?

    - by andre matos
    This is my simple query; By searching selectnothing I'm sure I'll have no hits. SELECT nome_t FROM myTable WHERE nome_t ILIKE '%selectnothing%'; This is the EXPLAIN ANALYZE VERBOSE Seq Scan on myTable (cost=0.00..15259.04 rows=37 width=29) (actual time=2153.061..2153.061 rows=0 loops=1) Output: nome_t Filter: (nome_t ~~* '%selectnothing%'::text) Total runtime: 2153.116 ms myTable has around 350k rows and the table definition is something like: CREATE TABLE myTable ( nome_t text NOT NULL, ) I have an index on nome_t as stated below: CREATE INDEX idx_m_nome_t ON myTable USING btree (nome_t); Although this is clearly a good candidate for Fulltext search I would like to rule that option out for now. This query is meant to be run from a web application and currently it's taking around 2 seconds which is obviously too much; Is there anything I can do, like using other index methods, to improve the speed of this query?

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  • PHP scandir strange behaviour

    - by kmunky
    ok, so what i'm trying to do is to scan the "previous" folder. $scanned = scandir(".."); foreach($scanned as $file){ if(is_file($file)){ print $file."<br />"; } } even though in my ".." directory i have 20+ files i get just three rows index.jpg index.php template.dtd i noticed that if i don;t use that is_file if clause it returns all file names; but i really need that if clause.

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  • Bash: easy way to put a configurable load on a system?

    - by WizardOfOdds
    In order to test how a program reacts when system resources become scarce (mainly the CPU but I'm interested in disk I/O too), I'd like to put an arbitrary load on the system. Currently I'm doing something like this: #!/bin/bash while true do echo "a" >> a.txt md5 a.txt done I could also start mp3-encoding audio files, or whatever. What would be an easy and small Bash script that could be used to simulate an arbitrary load, ideally configurable using parameter(s)?

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