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(_at_)saxonica(_dot_)com
+44 (0) 118 946 5893
On 18 Aug 2014, at 19:58, L2L 2L emanuelallen(_at_)hotmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> 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.
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