Why Do Some of the Oracle Default Scheduler Jobs Start at 6 AM in the Morning on Weekends (Doc ID 856426.1)

Last updated on DECEMBER 06, 2016

Applies to:

Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 10.2.0.5
This problem can occur on any platform.

Symptoms

Some of the Oracle default scheduler jobs, e.g. GATHER_STATS_JOB, start at 6 AM in the morning on weekends when the the WEEKEND_WINDOW starts at 12 AM.

SQL>SELECT owner, job_name, actual_start_date
    FROM dba_scheduler_job_run_details
    WHERE job_name LIKE 'GATHER_STATS%'
    order by actual_start_date desc;


OWNER     JOB_NAME                      ACTUAL_START_DATE

SYS             GATHER_STATS_JOB  28-AVR. -09 10.00.02.937690 PM +02:00
SYS             GATHER_STATS_JOB  27-AVR. -09 10.00.02.011118 PM +02:00
SYS             GATHER_STATS_JOB  29-AVR. -09 10.00.01.210822 PM +02:00
SYS             GATHER_STATS_JOB 25-AVR. -09 06.00.02.716352 AM +02:00  <----
SYS             GATHER_STATS_JOB 22-AVR. -09 10.00.00.565211 PM +02:00
SYS             GATHER_STATS_JOB  21-AVR. -09 10.00.01.906073 PM +02:00
SYS             GATHER_STATS_JOB   24-AVR. -09 10.00.02.742952 PM +02:00
SYS             GATHER_STATS_JOB  23-AVR. -09 10.00.02.846692 PM +02:00
SYS             GATHER_STATS_JOB  20-AVR. -09 10.00.02.354648 PM +02:00
SYS             GATHER_STATS_JOB  18-AVR. -09 06.00.02.203939 AM +02:00 <----

Cause

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