ADR(Automatic Diagnostic Repository)--> A a file-based hierarchical data store for managing diagnostic information, including network tracing and logging.
sys@ora11g>select * from v$diag_info; INST_ID NAME VALUE ------- ---------------------- ---------------------------------------------- 1 Diag Enabled TRUE 1 ADR Base /oracle/u01/app/oracle 1 ADR Home /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g 1 Diag Trace /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/trace 1 Diag Alert /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/alert 1 Diag Incident /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/incident 1 Diag Cdump /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/cdump 1 Health Monitor /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/hm 1 Default Trace File /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/trace/ora11g_ora_3968.trc 1 Active Problem Count 0 1 Active Incident Count 0 11 rows selected.
ora11g@RHEL53 /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/trace$ls -l alert_ora11g.log -rw-r----- 1 oracle oinstall 72513 Feb 27 14:29 alert_ora11g.log
ora11g@RHEL53 /oracle/u01/app/oracle/diag/rdbms/ora11g/ora11g/alert$ls -l log.xml -rw-r----- 1 oracle oinstall 327254 Feb 27 14:29 log.xml
ora11g@RHEL53 /home/oracle$alias alert alias alert='tail -200f $ORACLE_BASE/diag/rdbms/$ORACLE_SID/$ORACLE_SID/trace/alert_$ORACLE_SID.log'
ora11g@RHEL53 /home/oracle$alert