Is there any issue in scheduling GATHER_STATS_JOB during peak load times?

Hi All,
The default DBMS_STATS job(GATHER_STATS_JOB) is running during our peak load time.
Will it have any performance impact on normal database transactions?
Is it better to reschedule that window?
What all problems can we expect during the job's run(Object locks, High I/O due to table/index reads, High CPU usage etc)?
Please help me in getting the answer. I could not find relevant information from net.
Thanks and regards
Satish

Satish V C wrote:
I am struggling to find an appropriate period to run the job as this database is active 24*7 globally.
I want to know how the activity should be measured. Should it be based on no of sessions or number of transactions or number of cursors or net I/O or a combination of all above?Satish,
if you have the AWR license you could check the AWR reports to find out when your database is most idle. In the 10g time model the most significant aspect is the DB time spent, so the period where the DB time is least might be a good candidate.
You can also check the number of logical/physical I/Os performed per second, the number of sessions, and other ratios that are shown in the top part of the AWR report (e.g. section "Load Profile").
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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