Does gather_stats job hold a lock on the tabs and indxes it analyzes

Hi,
recently we have seen locking issues when gather stats job is run. The wait is 'library cache lock' wait event.
Wanted to know what kind of locks does gather_stats job hold on tables and indexes.
thanks,
Ven.

I have had locking issues with gather_stats as well.
I have an ETL job that runs every 5 minutes using dbms_job. This job updates materialized views (fast refresh on commit). It normally completes in one or two minutes.
When the maintenance window starts, gather stats starts running. The ETL process starts up, but it hangs until the maintenance window ends. At this time, the gather stats errors, seemingly releasing the ETL job to complete.
The odd thing is that when I look at the blocking locks during the maintenance window, it seems that it is the ETL process that has the lock, not the gather stats!
My only recourse is to turn off the ETL job to give gather stats a chance to run. Unless there are other ideas?

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Does gather_stats job hold a lock on the tabs and indxes it analyzes

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