The Alert log file contains the following information which can be used in tuning the database:
Checkpoint start and end times.
Incomplete checkpoints
Time to perform archiving
Crash recovery start and complete times.
egg:
conn sys/oracle as sysdba
show parameter log_checkpoint_interal
show parameter log_chenkpoint_timeout
show parameter fast_start_io_terget
show parameter fast_start_mttr_target
alter system checkpoint
show parameter alert
alter system set log_checkpoints_to_alert=true
V$views:listed in v$fixed_table 动态性能视图
select event,total_waits,total_timeouts,time_waited,average_wait from v$system_event;
select name,parameter1,parameter2,parameter3 from v$event_name;
select sid,seq#,event ,wait_time,state from v$session_wait