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HOWTO: setup in memory file system for temporary files

All temporary files created by Recital are stored in the directory specified by the environment variable DB_TMPDIR.

 
In order to have these files stored in memory first create a temporary directory
mkdir /opt/recital/tmp
 
Then mount the directory with the tmpfs command
mount -t tmpfs -o size=1g recitaltmpfs /usr/recital/tmp
 
Then change the DB_TMPDIR variable in the recital.conf to point to the newly created temporary directory.
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Recital Object-Oriented programming primer

Recital is a dynamic programming language particularly suited to the development of database applications. While Recital still supports standard procedural programming, new extensions to the language give you the power and flexibility of object-oriented programming. Object-oriented design and object-oriented programming represent a change in focus from standard procedural programming. This short primer will give you a good understanding of how to program object-oriented Recital.
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HOWTO: Using more than 4GB of memory on centos 5.3

If you have 4 GB or more RAM use the Linux kernel compiled for PAE capable machines. Your machine may not show up total 4GB ram. All you have to do is install PAE kernel package.

This package includes a version of the Linux kernel with support for up to 64GB of high memory. It requires a CPU with Physical Address Extensions (PAE).

The non-PAE kernel can only address up to 4GB of memory. Install the kernel-PAE package if your machine has more than 4GB of memory (>=4GB).

# yum install kernel-PAE

If you want to know how much memory centos is using type this in a terminal:

# cat /proc/meminfo
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HOWTO: Use a Gmail Account To Relay Email From a Shell Prompt on Redhat/Centos/Fedora

Usually, you do not need to setup an email server under Linux. Most GUI email clients support Gmail POP3 and IMAP configurations. But, how do you send mail via the standard /usr/bin/mail user agents in a shell script? Programs such as sendmail / postfix / exim can be configured as a gmail smarthost but they are largely overkill for this use. The ssmtp program is a neat utility that does just that for you via gmail.

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HOWTO: Installing 64bit Recital on Linux

For Recital to run correctly on 64bit Linux you require the ia32 shared libraries.

The 64bit port of Recital requires these libraries to allow access to 32bit Xbase and C-ISAM data files which are 32bit.

If you do not have these libraries installed you will either get a "can't find db.exe" or an "error loading shared libraries" when trying to run or license Recital.

Installing the ia32 shared libraries

Redhat EL 5 / Centos 5 / Fedora 10

  1. Insert the Red Hat Enterprise Linux 5 Supplementary CD, which contains the ia32el package.

  2. After the system has mounted the CD, change to the directory containing the Supplementary packages. For example:

    cd /media/cdrom/Supplementary/

  3. Install the ia32el package:

    rpm -Uvh ia32el-<version>.ia64.rpm

Alternatively: Note you must have the required repo's enabled. 
 yum install ia32el

Ubuntu / Debian

sudo apt-get install ia32-libs

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Increase memory allocation for Eclipse CDT on linux

If you use Eclipse Ganymede with large projects on linux you may run out of memory. To prevent this happening, you can specify the amount of memory to be allocated to Eclipse in the eclipse.ini file which is located in the eclipse directory.

Specifying this seems to reslove the problem:

-Xmx512m
-XX:MaxPermSize=512m

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Linux on a wall plug

I was fascinated to learn that marvel are shipping a complete linux device that runs on a wall plug for less than $100. The device has gigabit ethernet and USB connectivity making it ideal for building home security and surveillance devices that can be connected together. 

This would be an ideal device for Recital Embedded. Details can be found here. Additional information can be found here and this article in Scientific American 8 Big Things to Do with a Mini Server.

Seeing as this device runs linux, nomachine can be installed on it.  

Clearly this device has a lot of uses including acting as a loadbalancer and also as a bunch of loadbalanced application servers that access data on a network using glusterfs or samba. Another great use of this device would to configure it as a rsnapshot server to backup all the machines in your home! Interestingly in quantity the device is only US$50.

Marvell have a development wiki here.
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Menu Key

TIP
To access the menu bar in Recital, press the / key.

Full details on Recital Function Keys can be found in the Key Assist section of the Help menu, or in our documentation wiki here.
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Recital tuning guide - Part 1

Recital is a rich and versatile product with many ways to do the same thing. Developers usually write code in the way that they are accustomed to without paying much attention to how this will perform in a multi-user environment with large amounts of users and transactions. The best way to optimize Recital applications is to use the built-in tuning capabilities introduced in Recital 10.

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