日志切换通常是系统自动执行,不需要人为干涉。但是在某些情况下,需要强制日志切换,以下就几种方法。
1、修改系统参数
The following initialization parameter setting sets the log switch interval to 30 minutes (a typical value).
ARCHIVE_LAG_TARGET = 1800 ##ADG环境用的比较多。
2、手动切换
sql> conn / as sysdba
sql> ALTER SYstem SWITCH LOGFILE;
3、创建JOB,定时执行
alter session nls_date_format='DD/MM/YYYY HH:MM:SS AM';
BEGIN
DBMS_SCHEDULER.CREATE_JOB (
job_name => 'manual_log_switch',
job_type => 'PLsql_BLOCK',
job_action => 'BEGIN alter system switch logfile; END;',
start_date => sysdate,
repeat_interval => 'FREQ=HOURLY; BYMINUTE=00,30;', -- every 30 minutes
enabled => TRUE,
comments => 'force a log switch');
END;
/