Using dbms_workload_repository.create_snapshot() one can create AWR snapshot.
Example: Creates the snapshot and returns the snap id. If ‘ALL’ is not passed it defaults to typical (statistics_level).
SQL> select dbms_workload_repository.create_snapshot('ALL') from dual;
DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT()
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856
1 row selected.
To view snapshot
SQL> select end_interval_time, error_count from DBA_HIST_SNAPSHOT where snap_id = 856;
END_INTERVAL_TIME ERROR_COUNT
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25-AUG-10 11.03.17.486 PM 0
An Oracle Spin by Alex Lima 
Hi,
Do you know if one can create a snapshot from a unix shell
script ? I have sqlplus running nicely from a shell script and can issue SQL commands with no problem, but when I exec dbms_workload_repository.create_snapshot();
it will not work. I have Goggled for days, and have found no exapmples of this
Thank you for your time and expertise!
Hi Chris,
What is the error you see, which user does the script login as and can you send the script that you are using?