On Thu, 5 Dec 2002 10:16:16 -0700, Sarah Killcoyne wrote:
>I've found that using the "local infile import" query on files that are
>several mb in size takes up to a min per mb
I've posted a couple times recently on a Delphi project I wrote
to upload data from a client's Access database (3 tables) to the web on
demand. It is about 4 MB in size and though it does take time it takes
way less than 4 minutes. I did find out that using a query made a huge
difference over using a table (i.e. editing the MySQL table directly),
and using the REPLACE...VALUES syntax with multiple value entries made
a huge difference too. I ended up iterating through the table like
this (pseudocode):
while (still data left)
i = 1
querystr = 'replace delayed into....(cols) values '
while (still data left and i < 20)
querystr = querystr + (data)
i = i + 1
end
execute query
end
DELAYED made very little difference in the upload speed, but
seemed to allow use of the web database while the upload was happening.
Be careful about the size of the data though...one of the three tables
had many columns including a text field and I found that using "i < 20"
would result in a string that was too long.
- Steve Yates
- Between two evils, always pick the one you haven't tried.
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