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When a user comes to the main page on my site 100+ values are loaded from a MySQL db and are stored in the SESSION object. These values are used to customize everything from text to images on the site. So, there are tons of reads and writes to the SESSION object going on all the time.

The only problem I've seen is when I am sending email (multiple emails), processing credit cards (double,triple billing), and inserts into the db (duplicate inserts, key violations).

What MySQL table type are you using? If you are using MyISAM (the standard type) -- and it sounds like you are -- you are basically doomed. However, if you convert your database to use InnoDB tables, which support transactions, you should be fine. What versions of MySQLdb and ZMySQLDA are you using, and did you explicitly disable transaction support in ZMySQLDA?

I guess I'm doomed. ;-) I use MyISAM tables mainly because that was all that was available way back when the database was created. That was when MySQL was not concerned with and was even proud that they were not SQL compliant. Now years and 100Gig+ later nobody is brave enough to change the table types. Looks like I should at least change the table type on tables that Zope write to.

-- Computer interfaces should never be made of meat.

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