How to find a specific activity done by a particular user in the database

Question

How to find who (a specific user) does what (activities) on a specific date/time to certain Objects in a database instance. If similar posting and/or resources are available, please advise.
Thanks.

Answer 1

I have got the same problem. My operation steps is below:
1. create one dictory
mkdir /usr/local/dbs
chown oracle:oinstall /usr/local/dbs
2. modify the paramter
alter system set utl_file_dir='/usr/local/dbs' scope=spfile;
3. restart database
4. create the logmnr file:
BEGIN
dbms_logmnr_d.build(
dictionary_filename => 'logminer_dict.dat',
dictionary_location => '/usr/local/dbs');
END;
5. add the online redo log file:
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.new,logfilename =>'/u01/app/oracle/oradata/orcl/redo01.log');
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.addfile,logfilename =>'/u01/app/oracle/oradata/orcl/redo02.log');
execute dbms_logmnr.add_logfile(options =>dbms_logmnr.addfile,logfilename =>'/u01/app/oracle/oradata/orcl/redo03.log');
6. start logmnr
BEGIN
dbms_logmnr.start_logmnr(
dictfilename => '/usr/local/dbs/logminer_dict.dat');
END;
7. check the result
select sql_redo FROM v$logmnr_contents;
I got error message at the step:
ORA-01306:dbms_logmnr.start_logmnr() must be invoked before selecting from v$logmnr_contents
Could anyone help about this?