Hi Sanjay,
The preferred method for gathering statistics in Oracle is to use the
supplied automatic statistics gathering job. You could tune the automated
job so it completes succesfully. You could use parallelisim, change stale
percentage, use concurrent stats by setting Gather Optimizer Statistics
Default Options. You can also increase the maintenance window time, so the
job completes.
Following white papaer on "Best Practices for Gathering Optimizer
Statistics" may help. Please see section 'Improving the efficiency of
gathering statistics'
https://www.oracle.com/technetwork/database/bi-datawarehousing/twp-bp-optimizer-stats-04042012-1577139.pdf
Thank,
--Qaiser
On Wed, Aug 8, 2018 at 4:15 PM, Sanjay Mishra <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
Hi Experts
I had question on Auto Stats job in 12c which is running for 4hr now from
10pm to 2am. I had multiple heavy used environment where lost of objects
shows up for stale stats and the job failed to finish in 4 hr and so
multiple critical table stats were not collected. If I am running the job
as manually then can have more degree and can finish the job in less than 4
hr. So how Oracle allocated Degree when Degree defined for all database
objects is 1 and what can be done to update like preference or so to
complete the auto job in time. Don;t want to add layer by using cron
Rgds
Sanjay
