By v$rman_ backup_ job_ Oracle "bug" caused by details

    Recently checked backup , Find the problem ： Incremental backup of a production library requires 12 Hours , Normal backup only needs 5 second . Look at the screenshot

Get into rman Console , Check the relevant backup , The display duration is 5 second .

Describe the above problem again ： call v$rman_backup_job_details , Query display 196 The backup lasted 12 Hours , and rman Is displayed 196 Backup times are 5 second . Check the file for Linux The last visit time is 7-30 11:01

That's what I said ： from v$rman_backup_job_details Caused by the Oracle“bug” problem . My first thought is , Is it right? oracle One of the bug,2 Side time statistics are inconsistent .

       Okay , The problem is clear ？ Now start to solve the problem .

         The problem is found , The problem bothered me for a long time , But it has never been solved . The chance finally came , once , Check the scheduled task log in the system , Abnormal record found ： Check the system /var/log/cron journal , The discovery time is later than the system time 12 Hours . There is a problem with the system time zone . Ecstasy in heart , It's wired .

Check the time date, normal . see /etc/sysconfig/clock, Erroneous , Write ：

zone="America/New_York", Just the difference 12 Time zone .

      The problem is finally solved ： adjustment /etc/sysconfig/clock by shanghai The time zone , restart .