Thanks Jonathan. But I thought you were referring to a way to make Catalog writes transparently write to MySQL. The article you're pointing to teaches how to use use ZSQLMethods, which we're already doing. But the product we're using to do workflows (OpenFlow) uses the Zcatalog. So we either rewrite it to use MySQL, or we find a way to make Catalogs write to MySQL. Regards, Danny -----Original Message----- From: Jonathan [mailto:dev101@magma.ca] Sent: Thursday, May 08, 2008 10:08 PM To: Sinang, Danny Cc: zope@zope.org Subject: Re: [Zope] Making Zope stop storing old object versions <snip> ----- Original Message ----- From: "Sinang, Danny" <D.Sinang@spi-bpo.com> To: "Jonathan" <dev101@magma.ca> Cc: <zope@zope.org> Sent: Thursday, May 08, 2008 10:03 AM Subject: RE: [Zope] Making Zope stop storing old object versions How do I go about replacing a Catalog using MySQL ? This is the first time I've heard this. </snip> Here's the relevant chapter in the Zope Book: http://plope.com/Books/2_7Edition/RelationalDatabases.stx Jonathan