• unknown's avatar
    Optimization: in the replication slave, we can avoid doing one strlen() per event's execution, · 9aca45b3
    unknown authored
    as we already have db_len in Log_event. Only if rewrite_db() changed the db we need a strlen
    (so we now do the strlen() in rewrite_db). Plus a test (we had none for --replicate-rewrite-db :( ).
    
    
    sql/log_event.cc:
      The goal is to get of rid of one strlen() per replication event in slave:
      we don't need to compute strlen(thd->db) as we already have db_len in the event;
      only case where we need to do a strlen() is if rewrite_db() changed the db.
      Note that db_len is always a meaningful value. It's 0 if event's db is 0.
    sql/slave.cc:
      rewrite_db now returns the len of the returned db.
      print_slave_db_safe() needn't call rewrite_db() as rewrite_db() is already called by caller.
    sql/slave.h:
      declaration updates for slave.cc
    9aca45b3
slave.h 19.9 KB