Oracle Alert日志出现Incremental checkpoint up to RBA [0x5d02.5e5b.0], current log tail at RBA [0x5d02.7b8b.0]

可能新巡检某台Oracle数据库服务器alert日志会忽然发现有如下输出：

Wed Nov 21 05:46:04 2018
Incremental checkpoint up to RBA [0x5d02.5e5b.0], current log tail at RBA [0x5d02.7b8b.0]
Wed Nov 21 06:06:05 2018
Incremental checkpoint up to RBA [0x5d02.dfe7.0], current log tail at RBA [0x5d02.10ffa.0]
Wed Nov 21 06:26:06 2018
Incremental checkpoint up to RBA [0x5d02.16053.0], current log tail at RBA [0x5d02.1859d.0]

不过、这并不是数据库错误，只是因为log_checkpoints_to_alert参数的值设置的是true了，表示允许把checkpoint的信息写到alert日志中。

验证：

SQL> select name,value from v$parameter where name ='log_checkpoints_to_alert';