Administrating and Developing with Informix
Antonio Cangiano writes in his Zen and the Art of Programming blog that version 0.7.0 of the Python driver/wrapper for DB2 and Informix is now out of beta.
This release includes improved Unicode support, plus some bug fixes.
Antonio's blog also mentions in the comments that we can expect to see a Django adapter soon.[Read More]
RSS feeds provide a convenient way to display up to date information directly in your Firefox browser toolbar. I for one spend more time perusing the BBC News and Slashdot feeds than I should.
Implementing an RSS feed that displays database information is very simple, hence the 5 minute Informix RSS feeds..
These two examples, for JSP and PHP, display a summary of the last 20 orders from the IDS stores_demo database. They both use the following IDS 10.0 SQL query:
Five Minute JSP Informix RSS Feed
If you have a working Tomcat installation setting it up to work with Informix JDBC drivers is as simple as copying the JDBC jar files into $CATALINA_HOME/common/lib and restarting.
Customize the machine, Informix Server and links in this code and create a new Tomcat webapp. The resulting URL can be added to the Firefox toolbar as a Live Bookmark.
Five Minute PHP Informix RSS Feed
Here's the equivalent code in PHP. This example uses the Informix PDO Driver.
This should result in the same output as the JSP example.
The look of the XML output when viewed from a browser can be improved by using an XSL stylesheet, and various parameters such as refresh interval (TTL) can be tweaked. There are some good RSS tutorials and books available, or it can be fun to reverse engineer the stylesheet of your favourite news feed to see what they do.[Read More]
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Look out for the upcoming Ziff Davis seminar on Wednesday September 26th, when Kevin Brown and Madison Pruet will talk about 99.999% - How Available is Your Business?
"Attendees will hear from IBM IDS technical leaders Kevin Brown and Madison Pruet who will discuss the importance of reaching 99.999% uptime, and why this level of business continuity can rarely be achieved with a "one-size-fits-all" solution. The availability capabilities of IDS 11 will be prominently featured."
Inside Informix V11
Eric Herber has written an article about IDS 11 in Database Trends magazine, which includes a nice Open Admin Tool screenshot of a MACH11 topology. For the impatient, go to http://es1.tecnavia.com/ee/databasetrends/# and skip to page 18.
September Chat with Labs - RFID and Web Services
This month's Chat with the Labs covers the new Web Feature Service - which can provide a useful service layer for any kind of data, including GeoSpatial. Here's the blurb.
Location Based Services and RFID using Web Feature Services
This feature implements an Open GeoSpatial Consortium(R) Web Feature Service (OGC WFS) in IDSto act as a presentation layer for the Spatial and Geodetic DataBlade modules. The OGC WFS interface allows requests for geographical features across the web using platform-independentcalls. The XML-based GML (Geography Markup Language) is used as the encoding for transportingthe geographic features. Our speakers for this Chat will be Jerry Keesee, Director of the Informix Lab and Alan Caldera, Senior IDS Development Engineer.
RSVP for this Chat at: ttps://ww4.premconf.com/webrsvp/register?conf_id=7267470
Comments, questions: lspina AT us.ibm.com
There are 3 IIUG Cheetah tech days on the US West coast in the next week:
Since the directions to the San Jose IBM facility on the website are allegedly unreliable, here are the directions in full:
Morgan Hill/GilroyTake highway 101 and head North. Take the 880 highway exit, right and head towards Oakland. Go 4.1 miles to 237 and go West onto 237. Go 2.4 miles to the North First Street exit, turn right. We are on the right side - 4400 North First St.
From San Jose Airport:Get onto North/West 87 (Guadalupe Parkway) and take ramp onto highway 101, towards San Francisco. Take the Great America Parkway/Bowers exit and head right. Keep straight onto Great America Parkway for 1.9 miles. Take 237, right, towards Milpitas for 1.0 miles and take the North First Street exit and head North.You.ll now be going over 237. We are on the right side . 4400 North First St.
From San Francisco Airport:Get onto highway 101 and head South towards San Jose. Go 26.7 miles to 237, towards Milpitas. Go 4.7 miles to the North First Streetexit and head North. You.ll now be going over 237. We are on the right side - 4400 North First St.
From Oakland Airport/ East BayExit airport onto highway 880 South, go 26.3 miles to 237 West. Go 2.4 miles to the North First Street exit, turn right. We are on the right side, 4400 North First St.
Firstly, if you follow The Informix Zone you will already know there's a new Informix RedBook, 162 pages of high availability goodness entitled: Informix Dynamic Server V10: Superior Data Replication for Availability and Distribution. This compliments the RedBook published last December: Informix Dynamic Server V10 . . . Extended Functionality for Modern Business.
Secondly, IBM RedBooks are pioneering a new authoring process known as RedWiki. The old style RedBook authoring process took the form of a residency. Authors, typically IBM employees, would travel to a specific site and work there until the job was done. With the new process, anyone can apply to be an author, and the team collaborate on the book via a Wiki page from their regular locations working part-time. I like this concept, it can mean larger teams, and can draw on a greater pool of authoring talent. We use wiki pages extensively within Informix support and development both informally in small teams and in a larger more structured environment.
I turned down the last opportunity for a RedBook residency.. the flesh was willing but the time was lacking. With the Wiki-based authoring process I'd have probably applied. To see an example of the new style of RedWiki take a look at PHP Zend for i5/OS.
I hope this concept catches on and look forward to seeing some Informix RedBooks written this way. Judging by the expertise on display in the IIUG and comp.databases.informix newsgroups there would be no shortage of enthusiasm and talent for a distributed Informix RedBook.
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I just read an interesting post from ZDNet blogger Paul Murphy entitled Sun’s training problem..
I know of a Sun V880 installed in January of 2002 with eight 750Mhz processors, 16GB, and four A1000 disk packs that ran Informix 10 with Sybase/IQ with exactly zero downtime for almost three years despite a half dozen or so disk replacements and a Sybase upgrade....Paul's main point is about Sun not evangelizing their SMP and in-memory data integration solutions, though the implication is also there that IBM has work to do to evangelize the modernity, relevance and reliability of Informix Dynamic Server.
Reading this led me to reminisce about my first Sun machine at Informix, an Ultra 2, running several IDS instances, it never stopped working.[Read More]
The Informix Application Development blog marks its first anniversary today. When I started this blog a year ago I wondered how long it would be before I ran out of things to write and the blog went the way of most blogs, slowly running out of steam. Fortunately it has been a good year to be writing about Informix. With rapidly growing sales, an open beta for a major new release and many people generating content to review in the form of technical articles on developerWorks and other sites, there is always something to write about. There are more detailed articles lined up waiting for me to have time to write them.
A great sign of the rejuvenation of Informix is the proliferation of new blogs and websites devoted to the product in the past year. Highlights include The Informix Zone, independent of IBM and the definitive website for Informix advocacy and content. The Informix Technology blog, an excellent source of well-researched in-depth articles. Informix Magazine an IDS driven portal and aggregator for all things Informix. The IDS Experts blog - a new platform for Informix Tech Support and Development engineers. Meanwhile, the International Informix User Group has negotiated a free download of IDS with no time-limit, in addition to the growing repository of user contributed Informix utilities. Open source Informix initiatives have also been on the increase, for example the Informix Driver for Ruby and the continued development of DBD::Informix.
Lessons I have learned after a year of blogging include:
It has been fun writing the blog this past year and I have got to know some good people along the way. Informix has a loyal and growing following both inside and outside of IBM, having earned its status as a cult database through a combination of performance, reliability, small footprint and ease of administration that place it in a category of its own. Yes I am biased.[Read More]
This is part 1 of what will ultimately be a 3 part article describing an AJAX-based front end to an image database written in ZK - an event-driven component-based development framework. ZK can work well for GUI web applications as it provides a simple markup language to define the user interface and takes care of the AJAX synchronization behind the scenes.
Part 1 - Uploading and downloading images to a database
A ZK database application has the following dependencies (if you have ZK installed and you know how to get a database connection you can skip this part):
2. Create a Database
For part 1 a simple table consisting of an image number, image name and a byte data type to store an image is sufficient:
create database imgdb1;create table album(id serial, name varchar(100), img byte);create unique index nameIdx on album(name);
3. Create a new ZK Application
Create a new application directory, say "imgdb1", (under $TOMCAT_HOME/webapps if using Tomcat), and edit the WEB-INF/web.xml file to add ZK support. The ZK Quick Start Guide (PDF) section 5 describes how to do this.
4. Write the Presentation Layer
One of ZK's strengths is the ease of writing a user interface with the ZUML markup language. Note: the <ZK> tag shown here is closed in step 5. In my example, the code in steps 4 and 5 is written to a file called index.zul (which the server will recognize as a default file like index.html). A window containing the image and Display/Add/Delete buttons can be succinctly defined in ZUML as follows:
5. Write the Database Service Methods
The displayImage() method selects the named image from the database, retrieves it from the ResultSet as an InputStream object which can then be set to the image defined in the window via an AImage object.
The uploadImage() method calls FileUpload.get()to upload an image from the local filesystem to the database. If the file is confirmed to be an image it is retrieved as a byte array and bound to a prepared INSERT statement.
The deleteImage() method sends a DELETE statement to the database.
<zscript> import org.zkoss.image.AImage; import java.sql.*;import javax.sql.*;import javax.naming.*;In this example the Connection conn = ds.getConnection(); statement gets a JDBC connection from a connection pool. Replace this (and the Context and DataSource declarations) with a direct DriverManager.getConnection(url) call and associated initialization code if you prefer to make a direct connection.
Now, assuming the data server is online, pointing the browser to the application URL (in my case http://localhost:8080/imgdb1/) should display the application.
Part 2 will add basic browsing, update, delete, and a incorporate a few informational fields to the database application. Comments are welcome, particularly suggestions on improving the code.[Read More]
In part 1 of this article I looked at how to use the ZK AJAX web framework to:
The application created in part 1 was a demo of implementing these two methods, but did not do anything usable. In Part 2 I will use these methods to create to create a working BREAD (browse, read, edit, add, delete) application for a database table containing an image file and informational columns.
Note: This example was tested using the Firefox browser.
Part 2 - a photo database application
To convert the simple demo of part 1 into a working application the following major features will be added:
This article builds on part 1, and assumes a working ZK environment with database connectivity via JDBC, and a new or existing ZK application.
2. The species database
For this example I am choosing to store the photo column in a separate blobspace. This is a design choice at the Informix data server level and makes no difference to how the application works (it just reduces I/O to the physical log). On my Windows laptop the commands I used to create a 100Mb blobspace called blobspace were:
copy NUL c:\ifmxdata\%INFORMIXSERVER%\blobspaceonspaces -c -b blobspace -g 4 -p c:\ifmxdata\%INFORMIXSERVER%\blobspace -o 0 -s 102400ontape -s -L 0onmode -l
The new database will store some basic information about animal species in table spc_list: name, genus, species, photo:
create database imgdb2;
3. Define the presentation layer
In previous ZK examples I have inter-mingled ZUML markup tags which define the presentation with the ZSCRIPT Java code which defines the service methods. This is ok for small examples but starts to look messy for larger applications. This time the ZSCRIPT code is stored in a separate file: part2.jul for clarity. Note the file can have any name and extension, I just made up ".jul" to remind me that this is Java code sourced from a ".zul" file.
The GUI part of this application consists of a listbox on the left side of the screen. On the right side of the screen is an image and detail grid, with a panel of buttons separated by a splitter. This is my index.zul file:
<zk> <window title="Pacific Northwest Fauna" border="normal" width="1000px">Note one deviation from the default display characteristics.. I redefined the listbox element slightly using a STYLE tag to make the border between rows stand out more.
Note also there is one line of embedded zscript code at the end, to call the method to retrieve the records at startup, and pass on the name parameter if it has been optionally included in the URL (e.g. http://localhost:8080/imgdb2/?name=Hairy%20Woodpecker).
4. Define the service methods
This is the Java code to populate the listbox and implement functionality behind the buttons. The listbox is dynamically generated by implementing the ListitemRenderer class. Note that the listbox is populated using the retrieveRecords() method and is set to use the SimpleListModel.
The displayRec() method is called when a row in the listbox is clicked on and uses the same approach as in part 1 to select the image object from the database and display. In part 1 if the image was too large it would overflow the window it was defined in. Here the image is set to a fixed width of 500 pixels and the height is dynamically set to maintain the aspect ratio; this way the application maintains its overall proportions and the images are displayed correctly.
The file upload is implemented in a separate method called doFileGet() called when the New photo button is pressed. A boolean variable newImage is set when an image has been uploaded.
This allows the addRec() method to support adding a record with or without an image, and query the user to make sure they wanted to add a record if no new image is present.
Similarly the modifyRec() method can modify fields in the table without changing the image if the user did not upload a new image before pressing the Modify button.
The part2.jul file contains the following:
// image database application zscript codeimport org.zkoss.image.AImage; import java.sql.*;import javax.naming.*;import javax.sql.*;Now the application is starting to become useful, particularly for a small database; but suppose there were thousands of records - dumping them into a simple listbox is not going to work so well, the application would need to display records pages at a time. The following features would also be nice to have:
In part 3, when I get around to writing it, I'll look at adding some of these features. If you have any suggestions for part 3, or ways to improve the existing code please let me know.[Read More]
A new developerWorks article was published last week by Abhishek Mathur called Using the new Deployment Wizard in IDS Cheetah - New control for the IDS install process.
The article highlights an important new feature in IDS 11.10 install - the ability to customize which components are installed.
Now instead of copying all the files during installation, just those for the chosen components are copied. For IDS 10.0 and below most of the files in the media were language files of which only a small subset were likely to be relevant to your locale. I am not sure I go along with this sentence though..
Have you seen how large some other Enterprise RDBMS installations are? However the point of this sentence is well-intentioned. Perhaps 270Mb should be viewed as considerable if we can reduce the footprint by only copying the required files.
This goes a step towards Componentization - where you can pick and choose which Software components you wish to install rather than legacy all-or-nothing software installations.[Read More]
IBM announced a security vulnerability involving insecure use of the /tmp directory by the IDS and CSDK UNIX install scripts recently. The text of the announcement is here: Possible security vulnerabilities with Informix Dynamic Server, CSDK, and I-Connect product installers.
Reports of this vulnerability have been around since the beginning of October when someone called Larry Cashdollar sent an announcement directly to Bugtraq. As far as I can tell, in contrast to other security advisories we receive, IBM were not given any advance notice of this so had to start working on a response from that point. Since the announcement the usual security sites have picked it up, generally giving it a rating of less critical:
FrSIRT Security Advisories: IBM Informix Insecure Permissions and Temporary File Creation Vulnerabilities
Secunia Advisory #1: IBM Informix Dynamic Server Insecure Temporary File Creation
Secunia Advisory #2: IBM Informix Products Insecure Permissions and Temporary File Creation
Security Tracker: Informix Dynamic Server Uses Unsafe Installation Scripts and Directory Permissions That May Let Local Users Gain Elevated Privileges
I've been waiting for the dust to settle before writing about this given the less than critical impact, the straightforward workaround, the difficulty of exploiting and the IIUG coverage, but now the official IBM announcement is out it's worth at least highlighting the workaround:
Use the -log option when performing your product installation to redirect the temporary files created to a secure directory.
The following example from Jonathan Leffler illustrates using the -log workaround:
umask 077mkdir /tmp/informix./installserver -log /tmp/informixThis creates a directory with no public (or group) access, and then directs the install logs to that directory.
It is also worth mentioning that Informix products running on Windows do not have this vulnerability.[Read More]
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Adria Informix User Group Meeting 11/17/09
The Adria IUG president Hrvoje Zokovic sent me a note reporting on the 1st Adria Informix User Group Meeting..
Stockholm Informix User Group Meeting 11/16/09
After a busy week of meetings in the UK and Ireland I went to Stockholm to talk at the Stockholm Informix User Group meeting. I was a bit disappointed that it wasn't snowing but you can't have everything. The meeting started with an introduction from IBM Sweden's Information Management sales manager Fredrik Prien, followed by me presenting the IDS roadmap, then discussing embeddability, virtualization and cloud computing. Next up was Rickard Linck with a very detailed and informative talk on recent IDS features, followed by Ulf Åkerberg with an interesting talk on High availability demands at the Swedish Migration Board.
Speaking at this event turned out to be a lucrative endeavour, with all presenters receiving some bottles of Schnapps, Schnapps glasses and a scarf. Forgetting that the Schnapps was in my hand luggage and going through 3 sets of airport security to get home was challenging, but somehow I managed to bring them home without needing to drink them on the spot.
After the user group meeting most attendees decamped to a very pleasant Swedish restaurant for nourishment and bibulation..
Too bad this has already started, but it looks like a useful resource nonetheless: Ajax Code Camp - a free online class that describes itself as an 18 week training course, but in fact appears to be a 22 week course.
The class is written by San Shing, a technology architect at Sun, who puts the class material online in various formats as he writes. I read through Ajax Basics slides from week 1, a 65 slide PDF file with speaker notes which does a thorough job at explaining the fundamentals of AJAX.
It's good to see this much information presented in a class format made available for free. Note he is also asking for volunteers:
If you do Websphere now might be a good time to get involved in the Ajax for IBM WebSphere Platform Early Program..
The early program release includes:
The package is available to download for the usual platforms, along with a getting started guide and information center.
If anyone tries integrating this with Informix I'll be interested to hear how it went.[Read More]
So I ran into an interesting issue last week. A customer couldn't alter a table. Non-Exclusive access. Sounds pretty normal right? I mean after all it's not like a DBA doesn't see this fairly often.
The Normal routine is for a DBA to run the following:
However what happens when you still get non-exclusive access after doing the above?
You need to have two considerations then. #1, check for referential integrity issues, and #2 look for open cursors?
RI can be checked using dbaccess, or dbschema, but how do you check open cursors?
The easiest way is with
onstat -g opn
In the situation I wan into, we had several open cursors with transactions running against the child table holding RI.
This allowed us to identify where applications were forgetting to close the cursors. As soon as those cursors were closed, the alter table was successful.
From a development standpoint, this brings up a salient point to always remember, close your cursors.
For more info on onstat -g opn
Amazon Web Services announced an addition to their pricing model today called Reserved instances. Instead of just an hourly and usage fee, you pay an annual or triannual fee together with a lower hourly usage fee. The details can be found here: Amazon Elastic Compute Cloud Pricing.
If I take the simplest example of running a small standard demand Linux instance continuously for a year (8760 hours) in the US and ignore data transfer, storage and leap years, the prices work out as:
Reserved Instance: $325 + (8760 * 0.03) = $587.80
x = 4643 hours (rounded up)
To make a real world cost-effectiveness calculation for pay-by-the-hour computing resources implies you have a comprehensive understanding of your physical hardware costs (electricity, rack space, IT staffing/hardware support, equipment costs, replacement costs, etc.) as well as average and peak data storage and usage requirements factoring in growth, and implementation costs of any new software solution. The calculation is further complicated when data service providers start offering license fees by the hour instead of fixed one time or annual fees - another calculation around the number of usage hours required to break even becomes necessary.
Also to be factored in is whether security, performance, availability and reliability concerns outweigh the many cloud benefits including rapid scalability and SAAS friendly model. Not everyone is convinced commercial cloud offerings currently meet all the requirements: Cloud computing not fully enterprise-ready, IT execs say - though enough people are convinced to make for some nice looking graphs; and AWS customer numbers are now approaching half a million.[Read More]
Resources and publications relating to Data Studio are on the increase. Here is a quick round up of places to read about, download, post questions and follow tutorials pertaining to IBM Data Studio - the new Eclipse based data management and development environment..
There are two forums where you can post Data Studio questions and look for announcements, take your pick..
IBM Data Studio: Get started with Data Web Services
pureQuery: IBM's new paradigm for writing Java database applications.
Increase productivity in Java database development with new IBM pureQuery tools, Part 1: Overview of pureQuery tools
Common Development Tool
email for now. (Update: I since relented and switched comments back on.)[Read More]
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Today is turning into a good day for announcements...
Brought to you from Hagenau, France a new Web magazine has arrived: Informix Magazine. A Joomla! based creation, powered by IDS Cheetah, Hibernate and Java, Informix Mag describes itself as
..focusing on Informix Technology on products like IDS (Informix Dynamic Server), Informix 4GL (I-4GL)..
Looking at today's page it has some news items, as well as a conglomeration of other Informix news feeds, a DBA Zone and a Developer Corner for job postings.
JGP, looks good, when you read this please comment and tell us more about the site...
Here are Jean Georges Perrin's comments, which I'll add directly to this post, thanks JGP...
InformixMag aims to be the central place for Informix information, offering news, etc. It is purely a news site, it won’t have much unique and exclusive content, but I wish it to become the “Google for Informix information”. We have a real web-based forum, where we hope to see people discuss the news in a more efficient manner, etc. You have plenty of different partners already providing banners, Alfatec from Croatia, MoreData from Portugal, famous Kazer. We don’t want to “own” or steal content, just provide a convenient aggregation. We keep all copyright notices, and we are (soon) shortening long feeds, like yours :-). The project has been quite secret for a few months, released in a very early stage a few weeks ago, finding some partners has started last week. On the purely technical side, we have developed some technologies to aggregate the data from various places (including but not only RSS) and we are polishing the product and applying it in InformixMag. I’ll talk about the product later. It’s still alpha. We use a derived (or very extended) of Joomla, as you said, but the core of the data, is using Cheetah, Hibernate and Java…[Read More]
Hi all, another PSA today.
Still this one is pretty cool, because the lab will be talking about application development with Data Studio and Informix. Even if you don't use Data Studio, and even if you don't plan to, I highly recommend attending. The more interest a call like this generates, the more calls like this (i.e. Application Development) will occur.
The Washington Area Informix Users Group has announced free registration for Forum 2006 to anyone providing proof of a round-trip ticket from outside the United States. The regular registration price is $120. See the Forum Website for more details, including discount hotel rates.
Kudos to the conference organizers for encouraging international participation.[Read More]
So I got back from this years IIUG. It was a blast, as usual. The IIUG is making efforts to increase the number of presentations that are applicable to developers. This year it included presentations on Database programming with PHP, a section on open source coding with informix, programming with drupal, and then I did a best practices presentation for application developers.
I don't know when the IIUG will make the presentations available, but you do need to be a member to get them, and the process is simple, and free. Just go over to
And sign up.
Back in May I mentioned there may be a tech fair in Menlo Park later this year. I was a few miles out but if you're based in the California Bay Area mark your calenders for September 14th - the Bay Area Informix Tech Fair is going ahead in San Jose. This is an opportunity to spend a day learning about Informix topics from Advanced Support and Development engineers and meet other Informix users in the area. If you'd like to attend or have questions please RSVP..
FREE Informix Tech Fair
IBM Informix Advanced Support & Development Speakers:
Ajay Gupta, Guy Bowerman, Joaquim Zuzarte, Santosh Sajip, Suma Vinod,Vijay Lolabattu
Come and see demos integrating several application technologies.
Having a problem or question about Informix? Talk to an engineer and get free advice about your specific issue. Time is limited.
WHEN: September 14, 2006 9:15am - 4:30pm
4400 N 1st St, Suite 100
San Jose, CA 95134
The free Bay Area Informix tech fair is Thursday September 14th in San Jose. Send your RSVPs (or questions) to firstname.lastname@example.org if you can attend.
Here is a final list of planned talks and demos:
Bring your problems - engineers from Advanced Support and Development will be on-hand to discuss problems and answer questions. Hope to see you there.[Read More]
Here are the provisional agendas for the upcoming Beaverton and San Jose Informix tech fairs. Agendas are subject to whimsical and subliminal change.
Beaverton, OR - Wednesday May 20
San Jose, CA - May 28
The time after 2pm is currently set aside for more demo's and in depth chats with developers, advanced support and product management - bring your problems.
We're planning another Beaverton Tech Fair for May 20th. Not many details yet but here's what we have so far...
There will be a full day of talks, meet the developers lunch and new demos you have to see to believe.
There will be more details about this information packed day to follow. Please put this day on your
WHEN: May 20, 2009 between 9:00 – 4:30
WHERE: IBM Beaverton
15400 SW Koll Parkway
Beaverton, OR 97006
The Beaverton tech fairs are always good for a few giveaways, pizza, and lots of technical information. Hope to see you there.[Read More]
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Here are more details for the Beaverton Tech fair on May 20th...
Free Informix Tech Fair
Talks include the following topics:
IIUG President Stuart Litel
IBM Informix Engineers
Free ConsultingHaving a problem or question about Informix? Talk to an engineer and get free advice about your specific issue.
WHEN: May 20, 2009, 9:00 AM – 4:30 PM
WHERE: IBM Beaverton
15400 SW Koll Parkway
Beaverton, OR 97006
Hope to see you there.[Read More]