[CentOS] mysql question

Hi All

Can I know what is the meaning of the position?
Why there is nothing in the "Binlog_Ignore_DB"


mysql> show master status;
+-------------------+----------+---------------+------------------+
| File              | Position | Binlog_Do_DB  | Binlog_Ignore_DB |
+-------------------+----------+---------------+------------------+
| mysqld-bin.000006 |   183219 | dbname,dbname |                  | 
+-------------------+----------+---------------+------------------+

Thank you


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