alter system checkpoint & alter system switch logfile & alter system archive log current

alter system checkpoint

当前实例
alter system switch logfile;

RAC所有实例
alter system archive log all; --所有未归档且写满的重做日志文件进行归档
alter system archive log current; --当前的联机重做日志文件进行归档，并进行日志切换

实验