IBM mainframes process two thirds of the world’s business information every day, and havebeen doing so for decades, because of the many strengths provided by the mainframe, suchas high availability, good redundancy, high performance I/O capabilities, and much more.But have you ever been challenged by an anti-mainframer by a statement like "Oh, aren't mainframes dead?" - or - "Why would anyone still use a mainframe?" Have you wanted a ready response that is easily digestible and not overly techie? Well, IBM has a new Redguide book titled The IBM...
Monday, 30 March 2009
Thursday, 26 March 2009
Cost vs. Advantage of Moving From IMS DB to DB2
Posted on 11:22 by Unknown
As my regular readers know, every now and then I like to share Q+A exchanges I've had with folks. Today, the question I was asked is as follows:My customer is wondering about the possible advantages of converting his IMS DB/DC system to IMS DC/DB2. The application currently performs well with an internal response time of less than .5 seconds on average. Even with an arrival rate of 425 full-function transactions per second, the queue count rarely goes above 10. This system typically peaks at 12.5 million transactions per twelve-hour day against...
Wednesday, 18 March 2009
A Short Introduction to Lock Avoidance
Posted on 08:29 by Unknown
Lock avoidance is a mechanism employed by DB2 for z/OS to access data without locking while still maintaining data integrity. It prohibits access to uncommitted data and serializes access to pages. Lock avoidance improves performance by reducing the overall volume of lock requests. After all, let’s face it, the most efficient lock is the one never taken.Of course, even if it is not taking a lock, DB2 must still maintain the integrity of its data. Instead of taking a lock, DB2 uses a latch. To take advantage of Lock Avoidance, the SQL statement...
Friday, 6 March 2009
Attend the 2009 IDUG North American Conference (at a Discount)
Posted on 11:42 by Unknown
Today's blog post is just a friendly reminder to the DB2 community that the North American IDUG conference is fast approaching. This year's event will be held in Denver, CO from Tuesday May 12, 2009 through Friday, May 15th. And if you act quickly you can attend at a discounted rate using the early bird registration discount coupon valid through March 27th).And don't forget those day long seminars that IDUG holds before the regular conference. Instead of being on a Sunday, the seminars will be on the Monday before the conference this year! TheMonday-Friday...
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