Impact of running DBMS_STATS.GATHER_DATABASE_STATS online

Hi,
We're fairly new to DBA with an Oracle 9i database and have been having problems with performance. A lot of the querys were using full table scans instead of indexed scans.
We copied the database to our test database and ran the DBMS_STATS.GATHER_DATABASE_STATS() procedure and lo and behold the queries started using the indices again!!!
We now want to run this procedure via the Oracle Enterprise Manager but are unsure as to the effect that running this procedure will have with our users being logged in at the same time. Is it safe to run this procedure with the users logged on? We are not overly fussed if the users suffer reduced performance in the short term as in the long term they will have much improved performance.
Thanks
Tony

Hi all,
Tony has now gone on holiday for a week. We tried running the DBMS_STATS.GATHER_DATABASE_STATS() via Oracle enterprise manager on the live database last night with no users logged on. it failed with the following errors
ORA-04045 - errors during recompliation/revalidation of sys.dbmd_stats
ORA-06508 - Program being called not found
ORA-06512 - error on line 2
The database and application is supported by a software vendor who claim this is an Oracle bug which is being investigated, the package does however function perfectly on the test database on the same cluster. This test database was rebuilt two days ago using export and import from the live db. I could be wrong but based on some of the claims they have made in the past it seems unlikely. Could this be more of a permissions problem or that the target stats tables are not in place?
What would be the impact of running
ANALYZE TABLE schema.table COMPUTE STATISTICS;
against all tables with users logged on and would this be as effective as the dbms_stats package.
Thanks in advance
Dave.

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