Once you issue a LOCK TABLES command, you may not access any tables not in the LOCK statement. You must lock *ALL* tables you will use, perform your updates, and then UNLOCK TABLES.
I didn't know that. I reviewed the documentation. Thanks. OK, then my only remaining question is how many tables I can lock in a single SQL statement. I'm guessing no practical limit (i.e. thousands). What is the maximum length of a MySQL statement, anyway? Thanks.
