Velocis Beta-3.0 Database Server
As was stated earlier, we desired a database engine that had a C API interface (for precise, record-level access to the database) and supported the SQL and ODBC industry standards. The Itres database is running under Linux, which is the intranet database server. The server listens to ODBC communication requests from Windows 95/98 and NT and lets certain individuals run admin.exe under Windows. Yes, I'm guilty of doing that, but the Windows administration API is much nicer than the command-line-driven Linux version. The ODBC interface is provided primarily to enable Microsoft Access users to access the database, without yielding to Linux.
In order to interface with the Velocis SQL engine, we developed a Microsoft Access database conversion application based on VBA (Visual Basic for Application). This tool can read the table structures and data contents of any Microsoft Access 97 database and generate an ANSI SQL text file for the transfer purpose.
Any SQL-compatible database engine, such as Velocis, can read the SQL text files and import their contents from the Microsoft Access database. The Itres Microsoft-Access-based inventory database was successfully transferred to the Velocis.
It was also considered desirable for intranet users to have access (or views) into databases. The obvious viewing tool of choice is a web browser. To that end, we wrote CGI (Common Gateway Interface) scripts using Tcl (Tool Command Language from Scriptics Corporation). Tcl was extended as a dynamically loadable library, using Velocis' extensive native C API, to provide access to the database using SQL. These functions essentially utilized the sample source code for rsql found in Velocis' examples directory. From this point on, the effort shifted away from API integration with Velocis to a database-design project using SQL, which was our original goal.
In a nutshell, Velocis delivers all we expect of it: reliable operation, interoperability among computing platforms, a strong C API that supports complex operations and multithreading, standards-based ANSI SQL interpreter and reliable archive and recovery tools. Most importantly, Centura Software provides customer support (for a fee) necessary for operating in commercial settings.
We could use (and actually are using) PostgreSQL for prototyping SQL code on many computers, but when it comes to critical code, we prefer to use a supported tool. This preference also drove our selection of Red Hat Linux as a server platform.
Velocis is not perfect, and it does seem to have some potential rough spots (in the installation area and startup), but once configured and running, it works smoothly without complaints.
[Editor's Note: The company has changed name to Birdstep Technology, and Velocsis has become Birdstep RDM server 3.5.]
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide