Subject: Re: [xsl] Argument on XML From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Mon, 18 Aug 2014 22:30:22 -0000 |
This is off topic for the XSL List. And the answer is that the person who wrote this has obviously never heard of XML databases. In fact he knows very little about databases at all if he thinks the only real database is a SQL database. Michael Kay Saxonica mike@xxxxxxxxxxxx +44 (0) 118 946 5893 On 18 Aug 2014, at 19:58, L2L 2L emanuelallen@xxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > So I'm on a forum being school by some wizard. I don't know how to respond to this: > > XQuery to my knowledge exceed SQL very! > That statement is meaningless considering the fact that you don't understand what SQL is, let alone what it can do. > > Here's a question to ask yourself: if you think XQuery and XML are so much better than relational databases and SQL, then can you point to a single major website which uses XQuery/XML instead of a real database and SQL? I'll save you some research time - you can't. Consider a site that has 1 million users in its database. Assume that this site sees only 10 requests per second, so the traffic is not very high. Assume that each user record in the database averages 1KB of data. Since the entire XML structure needs to be read into memory in order to be used (unlike a real database), for that small traffic load of people just logging in, the server would need to use (1,000,000 * 1024 * 10) = 10,240,000,000 bytes ~ 10GB of memory just to handle 10 people trying to log in at the same time. Our dedicated servers each have 24GB of RAM, and it is not all dedicated to the database. That means that, with XML, our servers would only be able to handle 24 people using the system at the same time, assuming that every last byte of RAM was going to the database. Think about how many people use Facebook at the same time. Does it make any sense to use a data store technology that requires the entire database in memory every time any person accesses the system? When someone logs in to Facebook to get their list of messages, it would need to load the entire list of messages that every person has ever sent just to get that one person's messages? Does that really sound like a good plan to you? You have no idea about all of the optimizations that relational databases employ to make data storage and access as fast as possible, technologies that have been used for over 40 years, so what exactly qualifies you to make the judgement that XQuery and XML are so much better? > > By the way, the XML standard was introduced in 1996. PHP, let alone SQL, is older than XML. > > ---end of post------ > > > Can someone info me and give me a post that I can shape up and use to reply to this. > XSL-List info and archive > EasyUnsubscribe (by email)
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