Why using int for date? Better suited would be DATE or DATETIME (or even TIMESTAMP,
depending how you want to use it).
For studentid, SMALLINT or MEDIUMINT would maybe suffice, esp when you make them UNSIGNED.
For status I would choose CHAR(1), you can put a lot of information into that, which also
stays (a bit) human readable. Also enums would be ok but are a mess to change later (in
the application). Do yourself a favor and use a master detail relation for this, eg:
CREATE TABLE student_status (
Status CHAR(1) NOT NULL, /* short status flag, eg. A */
Verbose VARCHAR(20) NOT NULL, /* verbose description, e.g. ABSENT */
Maybe keep 'verbose' on char to force fixed line size and thus faster access.
From: nospam@stripped [mailto:nospam@stripped]
Sent: woensdag 9 juli 2003 16:42
To: mysql@stripped; Adam Gerson
Subject: Re: Can mysql handle this load?
i think this should be no problem...
i'd think of some table layout like this:
date int PRIMARY
student_id int PRIMARY
then you should get about 360,000 records per year.
i saw people on this list reporting about millions of records etc... and i guess they had
a little greater tables than you should get here.
but why would you want to move any previous records to another table all the time? just
keep it in one table and back up anything older than 5 years or so. that keeps your table
at, say 50 MB, and you can run real-time queries anytime :)
Von: "Adam Gerson" <agersonl@stripped>
Gesendet: Mittwoch, 9. Juli 2003 15:46
Betreff: Can mysql handle this load?
> I am writing an attendance system in php for my school. We have a
> little less then 1000 students. For every day of the school year one
> record will be entered into a table for each student representing their
> attendance status (present, absent, late, etc...). I also have several
> other supporting tables for relationships. When it comes to reporting
> and querying this DB I am worried that it will very quickly become very
> large and slow. Can mysql handle this? Are there any techniques to
> speed it up? I will trying indexing major columns.
> I have also considered keeping all previous days attendance in a
> separate table from the current days attendance and moving things over
> in the middle of the night. This way any operations on the current days
> data will go quickly, but reports on long term things will still be
> slow. Good idea?
> Adam Gerson
> Systems Administrator / Computer Teacher
> Columbia Grammar and Prep School
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