How to check oracle log ?

Hi..
How could i check any transaction or changes on oracle 10g ?. is there any log ?.
This is because i have found that the oracle timestamp suddenly change and become advance 1 hour. Due to that, i want to trace why the problem happen and what is the cause.
Might be somebody could advise me how to find out the cause, how to solved the problem.
Please help me..
Thank you,
Baharin

SQL> sho user
USER is "SYS"
SQL> desc dbms_logmnr
PROCEDURE ADD_LOGFILE
Argument Name               Type               In/Out Default?
LOGFILENAME               VARCHAR2          IN
OPTIONS               BINARY_INTEGER          IN     DEFAULT
FUNCTION COLUMN_PRESENT RETURNS BINARY_INTEGER
Argument Name               Type               In/Out Default?
SQL_REDO_UNDO               NUMBER               IN     DEFAULT
COLUMN_NAME               VARCHAR2          IN     DEFAULT
PROCEDURE END_LOGMNR
FUNCTION MINE_VALUE RETURNS VARCHAR2
Argument Name               Type               In/Out Default?
SQL_REDO_UNDO               NUMBER               IN     DEFAULT
COLUMN_NAME               VARCHAR2          IN     DEFAULT
PROCEDURE REMOVE_LOGFILE
Argument Name               Type               In/Out Default?
LOGFILENAME               VARCHAR2          IN
PROCEDURE START_LOGMNR
Argument Name               Type               In/Out Default?
STARTSCN               NUMBER               IN     DEFAULT
ENDSCN                NUMBER               IN     DEFAULT
STARTTIME               DATE               IN     DEFAULT
ENDTIME               DATE               IN     DEFAULT
DICTFILENAME               VARCHAR2          IN     DEFAULT
OPTIONS               BINARY_INTEGER          IN     DEFAULT

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