Re: RDMS Database's and/or Record Managers What good is Euphoria?
On 23 Jan 2004, at 2:20, Isaac Raway wrote:
>
>
> Kat wrote:
>
> >>Well, I've never used strtok, but I will give it a try now that you
> >>mention it. It looks to be most useful for parsing source code (which is
> >>great), but not for creating a database. Databases should not be doing any
> >>string tokenization of any kind. That wouldn't be a database, it'd be a flat
> >>text file.
> >>
> >>
> >Strtok was written to do data handling as far away from strict Pascal and C
> >records as possible. Been there, done that, not again.
> >
> >
> I didn't say anything about Pascal or C records. I'm talking about
> records in a relational database table, or a more flexible system in a
> object persistence system.
I didn't write the disk access methods, or the memory storage methods,
used by euphoria programs. And i didn't say the strtok lib made up a whole
and complete database "system".
> >> Databases use virtual file systems with paged
> >>storage methods and separate indexes, and most importantly, always
> >>access their data files in a binary fashion.
> >>
> >>
> >Not always. I found most of my accesses are wildmatches. Can't do a btree
> >with
> >wildcards. And as for "relational", Tiggr's has pointers to other data items,
> >executeable code, etc. And the db is not stored in memory. And the
> >
> >
> I didn't mean memory by paged storage methods. I mean that the
> database's actual disk file uses it's own pages, or sectors, to store
> the data. So, it allocated pages when needed, and markers them as
> deleted to be reused just like a physical hard drive. For seriously
> large databases with variable sized records, this is the only practical
> way to handle the data.
I didn't write the disk access methods, or the memory storage methods,
used by euphoria programs. And i didn't say the strtok lib made up a whole
and complete database "system".
Besides, for R&D purposes, my purposes, for this moment, right now, not
necessarily appropriate for you, i prefer they stay in a human-readable form.
Making them fixed-anything, or coded, or anysuch munging would just make
things more difficult for me right now.
> >contents are not fixed in any way or form.
> >
> For a business application, that could be a bad thing, though personally
> I do like flexibility to add fields to records, etc.
To each their own solution.
> >If i turn her lose, there is no way
> >the 5 gigs of data can be put in a Eu sequence in memory,, i'd need 20gig to
> >load it, and another 40gig to manipulate it, and i don't have the money to
> >waste like that. How you store and access the data on the drive is not
> >strtok's
> >business.
> >
> >
> It should be, because serious databases have most of their data on the
> HDD most of the time.
I didn't write the disk access methods, or the memory storage methods,
used by euphoria programs. And i didn't say the strtok lib made up a whole
and complete database "system".
> >But recently, someone asked about the access speed for a 1meg file, i gave
> >code
> >to read it in one sec, and parse the lines out in 1-2 sec (233mhz cpu), as if
> >each line was a data item. Each line could have held separate fields, free
> >form
> >lengths, and each of those could have held more fields, etc etc.
> >
> >
> Most SQLs read from multimegabyte files much faster than that. If you
> can count access time in seconds, you're in trouble.
I didn't write the disk access methods, or the memory storage methods,
used by euphoria programs. And i didn't say the strtok lib made up a whole
and complete database "system".
Besides, not much happens quickly on a multitasking OS like win95 on a
233mhz cpu. I am sure it would have done faster on dos32. And the time i
quoted was one file, of one megabyte, not a small file on a database of 1
million records. The small file in one million records would have been read
much much faster. Heck, using an direct windoze api call would have been
much faster.
> Through all of this discussion, please keep in mind that I am talking
> about truly massive databases. At least thousands of records.
Really, "at least thousands"? Let me look at harddrive T:/ here....
3.4 Gigabytes, 353,815 "records" in 1,185 "folders".
The Eu plugin for mirc could open 15 "folders", read in one record from each,
parse out a field from each record, parse out the fields in that field, and
display the data almost before i could get my finger off the <enter> key. I
was doing natural language parsing with 150,000+ "records", each with
multiply nested "sub-records". I used getxml() heavily, which isn't in the
current release of strtok, no one was interested in it. To get carried away, my
translator files have outgrown the 2 gigabyte partition they started out on. Is
2Gigs a big enough database for you to consider "massive"? That's E:/. One
of it's "records" has 355,742 "sub-records". How about if you add the
aforementioned T:/ to E:/? What if you toss in F:/ with it's 4.6 Gigs of data
(in
105,052 "records" )?
<kat> apa khabar?
<[Tiggr]> all's kool here 
> >YMMV
> >
> >
> Forgive me, I don't understand this... ?
<kat> Tiggr, can you tell me what YMMV means?
<[Tiggr]> Your Mileage May Vary
Kat,
just luvs it when people feel the need to explain such simple concepts as
"massive" to her. 
( say something Lomax.... )
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