I don't know whether db2 has stored procedures.

It does, as do Informix and SQL Server.

I believe, but am not certain, that the concept of stored procedures (and triggers) began with DB2 in order to support CICS and IMS respectively.

I agree that MySQL has a long way to go before it can be consider a substitute for any one of the commercial RDMBSs. I've heard that PostGRE is moving up quite rapidly, but also still has a ways to go. That said, given the contrast in the funding for the commercial -v- "free" RDBMSs, they aren't doing at all badly given their relatively short histories.