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In a database there is a username called u1, someone tried to access u1 but due to wrong password it got locked. How to find who did this suspicious activity.

  • Do you have auditing enabled? – Philᵀᴹ May 21 '14 at 8:28
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You can find information about connection in listener.log Location is under $ORACLE_HOME/diag/ or $ORACLE_HOME/network/log

  • +1 but how canI find the sessions that do the wrong login? – miracle173 Jul 28 '14 at 22:02
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IF you really want to know who locked the account you should turn on auditing for failed connections. The listener.log file will show connections, it won't show which connections failed.

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