[syslog-ng] Reading Log file

Can someone tell me what the numbers mean for processed and dropped? Am I logging everything to SQL or am I dropping some? Mar 9 17:12:03 syslog01 syslog-ng[1738]: Log statistics; processed='source(s_gms)=2279331', dropped='dst.sql(d_mssql#0,freetds, rawsql.adbcefg.net,1785,Syslog)=2213605', stored='dst.sql(d_mssql#0,freetds, rawsql.abcdefg.net,1785,Syslog)=0',