Comments
yourfanat wrote: I am using another tool for Oracle developers - dbForge Studio for Oracle. This IDE has lots of usefull features, among them: oracle designer, code competion and formatter, query builder, debugger, profiler, erxport/import, reports and many others. The latest version supports Oracle 12C. More information here.
Cloud Expo on Google News
SYS-CON.TV

2008 West
DIAMOND SPONSOR:
Data Direct
SOA, WOA and Cloud Computing: The New Frontier for Data Services
PLATINUM SPONSORS:
Red Hat
The Opening of Virtualization
GOLD SPONSORS:
Appsense
User Environment Management – The Third Layer of the Desktop
Cordys
Cloud Computing for Business Agility
EMC
CMIS: A Multi-Vendor Proposal for a Service-Based Content Management Interoperability Standard
Freedom OSS
Practical SOA” Max Yankelevich
Intel
Architecting an Enterprise Service Router (ESR) – A Cost-Effective Way to Scale SOA Across the Enterprise
Sensedia
Return on Assests: Bringing Visibility to your SOA Strategy
Symantec
Managing Hybrid Endpoint Environments
VMWare
Game-Changing Technology for Enterprise Clouds and Applications
Click For 2008 West
Event Webcasts

2008 West
PLATINUM SPONSORS:
Appcelerator
Get ‘Rich’ Quick: Rapid Prototyping for RIA with ZERO Server Code
Keynote Systems
Designing for and Managing Performance in the New Frontier of Rich Internet Applications
GOLD SPONSORS:
ICEsoft
How Can AJAX Improve Homeland Security?
Isomorphic
Beyond Widgets: What a RIA Platform Should Offer
Oracle
REAs: Rich Enterprise Applications
Click For 2008 Event Webcasts
Programmable Cache-Control: One Size Does Not Fit All
For addressing challenges related to performance of mobile devices and networks, caching is making a comeback

It's interesting - and almost amusing - to watch the circle of technology run around best practices with respect to performance over time. Back in the day caching was the ultimate means by which web application performance was improved and there was no lack of solutions and techniques that manipulated caching capabilities to achieve optimal performance.

Then it was suddenly in vogue to address the performance issues associated with Javascript on the client. As Web 2.0 ascended and AJAX-based architectures ruled the day, JavaScript was Enemy #1 of performance (and security, for that matter). Solutions and best practices began to arise to address when JavaScript loaded, from where, and whether or not it was even active.

And now, once again, we're back at the beginning with caching. In the interim years, it turns out developers have not become better about how they mark content for caching and with the proliferation of access from mobile devices over sometimes constrained networks, it's once again come to the attention of operations (who are ultimately responsible for some reason for performance of web applications) that caching can dramatically improve the performance of web applications.

[ Excuse me while I take a breather - that was one long thought to type. ]

Steve Souders, web performance engineer extraordinaire, gave a great presentation at HTML5DevCon that was picked up by High Scalability: Cache is King!.

The aforementioned articles notes:

Use HTTP cache control mechanisms: max-age, etag, last-modified, if-modified-since, if-none-match, no-cache, must-revalidate, no-store. Want to prevent HTTP sending conditional GET requests, especially over high latency mobile networks. Use a long max-age and change resource names any time the content changes so that it won't be cached improperly.

-- Better Browser Caching Is More Important Than No Javascript Or Fast Networks For HTTP Performance

The problem is, of course, that developers aren't putting all these nifty-neato-keen tags and meta-data in their content and the cost to modify existing applications to do so may result in a prioritization somewhere right below having an optional, unnecessary root canal. In other cases the way in which web applications are built today - we're still using AJAX-based, real-time updates of chunks of content rather than whole pages - means simply adding tags and meta-data to the HTML isn't necessarily going to help because it refers to the page and not the data/content being retrieved and updated for that "I'm a live, real-time application" feel that everyone has to have today.

Too, caching tags and meta-data in HTML doesn't address every type of data. JSON, for example, commonly returned as the response to an API call (used as the building blocks for web applications more and more frequently these days) aren't going to be impacted by the HTML caching directives. That has to be addressed in a different way, either on the server side (think Apache mod_expire) or on the client (HTML5 contains new capabilities specifically for this purpose and there are usually cache directives hidden in AJAX frameworks like jQuery).

The Programmable Network to the Rescue

What you need is the ability to insert the appropriate tags, on the appropriate content, in such a way as to make sure whatever you're about to do (a) doesn't break the application and (b) is actually going to improve the performance of the end-user experience for that specific request.

Note that (b) is pretty important, actually, because there are things you do to content being delivered to end users on mobile devices over mobile networks that might make things worse if you do it to the same content being delivered to the same end user on the same device over the wireless LAN. Network capabilities matter, so it's important to remember that.

To avoid rewriting applications (and perhaps changing the entire server-side architecture by adding on modules) you could just take advantage of programmability in the network. When enabled as part of a full-proxy, network intermediary the ability to programmatically modify content in-flight becomes invaluable as a mechanism for improving performance, particularly with respect to adding (or modifying) cache headers, tags, and meta-data.

By allowing the intermediary to cache the cacheable content while simultaneously inserting the appropriate cache control headers to manage the client-side cache, performance is improved. By leveraging programmability, you can start to apply device or network or application (or any combination thereof) logic to manipulate the cache as necessary while also using additional performance-enhancing techniques like compression (when appropriate) or image optimization (for mobile devices).

The thing is that a generic "all on" or "all off" for caching isn't going to always result in the best performance. There's logic to it that says you need the capability to say "if X and Y then ON else if Z then OFF". That's the power of a programmable network, of the ability to write the kind of logic that takes into consideration the context of a request and takes the appropriate actions in real-time.

Because one size (setting) simply does not fit all.

Read the original blog entry...

About Lori MacVittie
Lori MacVittie is responsible for education and evangelism of application services available across F5’s entire product suite. Her role includes authorship of technical materials and participation in a number of community-based forums and industry standards organizations, among other efforts. MacVittie has extensive programming experience as an application architect, as well as network and systems development and administration expertise. Prior to joining F5, MacVittie was an award-winning Senior Technology Editor at Network Computing Magazine, where she conducted product research and evaluation focused on integration with application and network architectures, and authored articles on a variety of topics aimed at IT professionals. Her most recent area of focus included SOA-related products and architectures. She holds a B.S. in Information and Computing Science from the University of Wisconsin at Green Bay, and an M.S. in Computer Science from Nova Southeastern University.

Latest AJAXWorld RIA Stories
To Really Work for Enterprises, MultiCloud Adoption Requires Far Better and Inclusive Cloud Monitoring and Cost Management … But How? Overwhelmingly, even as enterprises have adopted cloud computing and are expanding to multi-cloud computing, IT leaders remain concerned about how...
Containers and Kubernetes allow for code portability across on-premise VMs, bare metal, or multiple cloud provider environments. Yet, despite this portability promise, developers may include configuration and application definitions that constrain or even eliminate application po...
SYS-CON Events announced today that Silicon India has been named “Media Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Published in Silicon Valley, Silicon India magazin...
Founded in 2000, Chetu Inc. is a global provider of customized software development solutions and IT staff augmentation services for software technology providers. By providing clients with unparalleled niche technology expertise and industry experience, Chetu has become the prem...
DXWorldEXPO LLC announced today that "IoT Now" was named media sponsor of CloudEXPO | DXWorldEXPO 2018 New York, which will take place on November 11-13, 2018 in New York City, NY. IoT Now explores the evolving opportunities and challenges facing CSPs, and it passes on some lesso...
Subscribe to the World's Most Powerful Newsletters
Subscribe to Our Rss Feeds & Get Your SYS-CON News Live!
Click to Add our RSS Feeds to the Service of Your Choice:
Google Reader or Homepage Add to My Yahoo! Subscribe with Bloglines Subscribe in NewsGator Online
myFeedster Add to My AOL Subscribe in Rojo Add 'Hugg' to Newsburst from CNET News.com Kinja Digest View Additional SYS-CON Feeds
Publish Your Article! Please send it to editorial(at)sys-con.com!

Advertise on this site! Contact advertising(at)sys-con.com! 201 802-3021


SYS-CON Featured Whitepapers
ADS BY GOOGLE