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  • Trying to create a database with UNICODE does not always work. I ran in a problem with a RedHat installation...

    There can be two problems:

    1. The default database setup is ASCII (more or less considered ISO-8859-1)
    2. The database cluster was compiled without UNICODE support

    Now a day, the second case is quite unlikely and it means that you won't  be able to use a UNICODE encoding unless you recompile the database system. Make sure you use the ./configure --multi-byte encoding for that purpose.

    In the first case, however, it could be that your cluster was initialized ...

  • When you use a PostgreSQL database, it gets vacuumed every night (by default on most systems, verify on yours, it may not be the case...) This is a quite simple process to make sure that the database remains fast. And it works great, also. You can have millions of entries and it remains very fast (they have real good algorithms to auto-generate index files as required by your repetitive queries.)

    The problem is that tables are being grown for 24h and then they get cleaned up. They can then grow again for 24h. If you don't clean up, the tables continue to grow, fast. Up to the point where ...

  • How to install your system to be able to boot from any Operating System

    Problems

    Problems with booting... numerous emails & posts about this one, that's for sure!!! Real solutions? Not really... In many cases people end up reinstalling their system from Scratch and once in a while even that doesn't work! But smart people have a way to fix their boot sectors without too much hurdle (instead of the hours it takes to install an OS.)

    Yes! There ought to be a reason for things not to work so well once in while. In most cases, if you only have proper ...

  • To read files out of your repository via SSH, set your CVSROOT variable to something like this:

    export CVSROOT=":ext:login-name@host//cvs/path/root"

    What tells CVSROOT that it will get the data from an external host is the <em>:ext:</em> at the start of the URL.

    The <em>login-name</em> is your name or whoever's login name you can use to connect to the computer.

    It is assumed that you can already connect with SSH.

  • I use the Cassandra database cluster system to manage a new set of websites and once in a while I start getting many errors and the website stops working altogether.

    When that happens, it is likely that Cassandra broke something in the temporary tables that it holds. The only way to go past that problem is to clear those tables. Until then, it will fail over and over again (they really would need some euristic to auto-clean up even if it means that you're losing some data.)

    The command to repair the database, really quick, is as follow:

    nodetool scrub snap_websites files
    

    Note that ...

  • Description

    I wrote a small shell script (bash) to make a backup of one of my hard drive to another. Really, a very very simple script. It has one rsync command per partition. So I have one variable to define all the options and one rsync call per partition:

  • I have different scripts that synchronize different hard drives for either backup or just synch-ing my development system with one of the production systems.

    I got an error for a little while after I created a folder on a destination as I wanted to make sure that the source folder was being copied...

    That generated an error as follow:

      rsync: delete_file: rmdir "<destination>" failed: Directory not empty (39)
      rsync error: some files could not be transferred (code 23) at main.c(977) [sender=2.6.9]
    

    The fact is that the source file was a softlink and not a folder. So ...

  • I guess I liked Netscape just way too much... I used Mozilla after Netscape went down and bust, then I continued with SeaMonkey 1.x and now I just finished installing SeaMonkey 2.0.

    There are features in this system that are just better than in FireFox. However, SeaMonkey 2.0 is a re-sync. with FireFox 3.x. In other words, this is very similar to FireFox, with the correct display features of the HTML code. But it keeps the menu, preferences and look in general of SeaMonkey. (although the fonts have changed... I'll have to get used to those!?)

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  • If you are using a folder much, then you can create a substitute using the subst command in a shell. This command will assign a path to the given letter and the result is something which looks like you had an additional hard drive.

  • System tables and how to edit them is just not defined in the SQL language, unfortunately. So different database systems have different solutions to handle their table declarations. PostgreSQL is no different.

    In most cases, MySQL uses some special instruction to update system information. In PostgreSQL, you have internal tables that the administrator can access and tweak as required.

    [toc hidden:1]
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    In Information Technology a device is generally a physical item that can be controlled by the computer. The hard drive, a USB camera, a memory chip, etc. are all devices.

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