I didn't say disk caching, usually I cache to ram, either on the server, or the load balancer.
> -----Original Message----- > From: Adam Churvis [mailto:[EMAIL PROTECTED] > Sent: Monday, February 19, 2007 2:57 PM > To: CF-Community > Subject: Re: Storing images in DB. > > Nick, > > You wouldn't employ disk caching if it weren't coming from the DB > because the files would already be written to disk in their native > format, so we must be talking about two different things. > > And yes, your CMS might store static page elements as binaries in the > database, and it does make sense. SharePoint 2007 does, which is > precisely why it also employs both disk caching and page output > caching. In fact, each image, JavaScript file, cascading style sheet, > or other page element is stored as a binary in the database with > SharePoint 2007. That's what makes solid centralized management of > complex content possible. > > So if I was forced to use replication to transport content changes, I > would still immediately disk cache (just convert and write out to disk) > those images and serve directly from IIS, rather than expend all those > resources going through all those extra layers. Update timestamps > could be employed to track only those images and other assets that had > changed since the previous update, and the system could just write > those to disk and ignore the rest. > > In fact, we have a commercial product we created over a year ago that > hasn't been launched yet that can handle this sort of thing > transparently in the background in realtime as images are added, > updated, or deleted. It's called FileRobot, and it can be extended > using the .NET Framework to do just about anything you want with any > kind of file, from running complicated RegEx on text contents to > performing XSLT transformations, image manipulations, file copies, FTP, > etc. Just haven't had the time to put it out there yet. We've been > using it in production on very heavy load systems with literally > millions of images, and it works great. > > Respectfully, > > Adam Phillip Churvis > Certified Advanced ColdFusion MX 7 Developer > BlueDragon Alliance Founding Committee > > > > Get advanced intensive Master-level training in > C# & ASP.NET 2.0 for ColdFusion Developers at > ProductivityEnhancement.com > > ----- Original Message ----- > From: Nick McClure > To: CF-Community > Sent: Monday, February 19, 2007 2:02 PM > Subject: RE: Storing images in DB. > > > Yes, never with CF, but I've done it before, and I've employed > caching > techniques both on the server and on the load balancer to assist, but > I'd do > that even it they weren't coming from the DB. > > You don't put static page images in the DB, that doesn't make sense, > but if > you are wanting to replicate the data to multiple locations, it seems > silly > to have to replicate file content when SQL Server has this stuff > built in. > > How would you replicate data and images across multiple locations? > > > -----Original Message----- > > From: Adam Churvis [mailto:[EMAIL PROTECTED] > > Sent: Monday, February 19, 2007 1:30 PM > > To: CF-Community > > Subject: Re: Storing images in DB. > > > > Nick, > > > > Have you ever tried this *under load* with either a large number of > > images on a single web page, a single large image, or a combination > of > > these? It all seems about the same on the work bench, but it's a > whole > > different story under load, which is all that really matters. This > is > > why Microsoft itself employs sophisticated caching schemes to > eliminate > > the need to touch the database for binaries any more than it > absolutely > > has to. > > > > Also, look at every single step of what *actually* happens when you > > retrieve binary data from the database, serve it, and convert it. > > You're being a bit too simplistic when you mention the pointer > stored > > in the table, as if that somehow makes it like a direct file > retrieval > > from disk. There's a lot of work that's done to make this happen, > and > > it does make a difference that you'll notice under a realistic > load. > > > > Respectfully, > > > > Adam Phillip Churvis > > Certified Advanced ColdFusion MX 7 Developer > > BlueDragon Alliance Founding Committee > > > > > > > > Get advanced intensive Master-level training in > > C# & ASP.NET 2.0 for ColdFusion Developers at > > ProductivityEnhancement.com > > > > ----- Original Message ----- > > From: Nick McClure > > To: CF-Community > > Sent: Monday, February 19, 2007 10:44 AM > > Subject: RE: Storing images in DB. > > > > > > We aren't talking about static page images, those types of images > > should be > > on the web server. He is looking for a way to ensure that the > data > > and the > > images aren't kept separate from each other. > > > > In an environment such as this, keeping the images in the > database is > > a > > great idea. The data is stored in a fairly similar way, binary > data > > such as > > this isn't stored in the tables, the table only holds a pointer > to > > the > > actual data. The performance change from accessing the images via > a > > networked file server vs a database isn't going to be major for a > > small > > percentage of images. > > > > > > > > > -----Original Message----- > > > From: Adam Churvis [mailto:[EMAIL PROTECTED] > > > Sent: Monday, February 19, 2007 10:25 AM > > > To: CF-Community > > > Subject: Re: Storing images in DB. > > > > > > Listen to Rick. And picture in your minds the two very > different > > pipes > > > needed to retrieve, process (or not) and serve, and the > mechanisms > > > through which each must pass, and how the system's resources > react > > to > > > each. Think about how database-persisted binary data is > physically > > > stored, retrieved, delivered, and converted. > > > > > > Even systems like SharePoint rely on a combination of disk > caching > > and > > > page output caching after the first retrieval of a page's > > constituent > > > parts from the database. Database storage is for management > > > convenience only; a sophisticated scheme is employed to get > those > > > assets out on disk as regular files and then serve them from > there. > > > > > > Respectfully, > > > > > > Adam Phillip Churvis > > > Certified Advanced ColdFusion MX 7 Developer > > > BlueDragon Alliance Founding Committee > > > > > > > > > > > > Get advanced intensive Master-level training in > > > C# & ASP.NET 2.0 for ColdFusion Developers at > > > ProductivityEnhancement.com > > > > > > > > > > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Upgrade to Adobe ColdFusion MX7 The most significant release in over 10 years. Upgrade & see new features. http://www.adobe.com/products/coldfusion Archive: http://www.houseoffusion.com/groups/CF-Community/message.cfm/messageid:228360 Subscription: http://www.houseoffusion.com/groups/CF-Community/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.5
