here you go, it was given to me Monday from this list....dave whiterod I think ;)
You may find the following link useful: ColdFusion Server (Versions 5 and Prior): ColdFusion Locking Best Practices TechNote 20370 http://www.macromedia.com/v1/handlers/index.cfm?ID=20370&Method=Full also, from dave watts.... The thought process is very simple. If you're running CF 5 or earlier, and you're using session variables, and you don't lock them, bad things will happen. Memory variables can be accessed by concurrent requests, and CF doesn't handle that well, by default. While you might not think session variables would be used by concurrent requests, there are many possible cases in which more than one request from the same user might be running concurrently. > any good books on that topic? A book would be overkill, just for this topic. If you're using CF 5 or earlier, just follow these simple rules: 1. Dvery time you put "Session", "Application" or "Server" in your code, use CFLOCK around it. 2. If you're using any version of CF which supports the SCOPE attribute (4.5+, I think), use that with your CFLOCK tags around memory variables. 3. If you're reading a memory variable, use TYPE="READONLY" in your CFLOCK; if you may change the variable's value, use TYPE="EXCLUSIVE". 4. There is no rule 4. 5. Reread rule 1. ..tony Tony Weeg Senior Web Developer Information System Design Navtrak, Inc. Fleet Management Solutions www.navtrak.net 410.548.2337 -----Original Message----- From: Pablo Nevares [mailto:[EMAIL PROTECTED]] Sent: Tuesday, September 24, 2002 2:56 PM To: CF-Talk Subject: variable locking and transactions I've been looking up information on cflock and cftransaction lately, I'm sad to say that I haven't had any experience using them in the past. Am I correct in saying that as a best practice cflock should always be used when you're accessing or modifying variables in Session, Application, or Server scopes? And you use the ReadOnly type when you're only going to access the variable, and exclusive when there's any chance it'll be modified? I'm a little more confused about cftransaction. I understand that you can either commit or rollback queries with it, but is this also how you lock databases? If I don't want two people inserting new records into the database at once, would I just do a normal cftransaction with a commit at the end? Thanks in advance for any help. Pablo Nevares [EMAIL PROTECTED] ______________________________________________________________________ This list and all House of Fusion resources hosted by CFHosting.com. The place for dependable ColdFusion Hosting. FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
