Is it better to set multiple primary keys or to set one key and index the other columns? If I have a primary key as a field in another table should it also be set as a key?



Adam

On Wednesday, July 9, 2003, at 10:41 AM, <[EMAIL PROTECTED]> wrote:

i think this should be no problem...

i'd think of some table layout like this:
date         int      PRIMARY
student_id   int      PRIMARY
status       int
extra_data   what-you-want

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 :)

-yves


-----Ursprüngliche Nachricht----- Von: "Adam Gerson" <[EMAIL PROTECTED]> An: <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> 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?


Thanks,
Adam





-------------------------------
Adam Gerson
Systems Administrator / Computer Teacher
Columbia Grammar and Prep School
212-749-6200
[EMAIL PROTECTED]
www.cgps.org


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