training bayes database

[Matthew Broadhead]

system setup centos-release-7-4.1708.el7.centos.x86_64, 
spamassassin-3.4.0-2.el7.x86_64, amavisd-new-2.11.0-3.el7.noarch

/etc/mail/spamassassin/local.cf:
required_hits 5
report_safe 0
rewrite_header Subject [SPAM]
use_bayes          1
bayes_auto_learn   1
bayes_auto_expire  1

# Store bayesian data in MySQL
bayes_store_module Mail::SpamAssassin::BayesStore::MySQL
bayes_sql_dsn       DBI:mysql:sa_bayes:localhost:3306

it is storing the info to the database ok.  but it doesn't seem to be 
filtering any mail.