I played Oracle 11g. It was a bit problematic. I wanted to check the log and found it for half a day. The original 11g Alert Log was changed, starting from Oracle 11g, oracle Database provides alert logs in two formats: XML and traditional text.
The new log location is determined by the automatic diagnostic repository (ADR. You can use the new initialization parameter diagnostic_dest to control the location of the ADR base.
SQL> show parameter diagnostic_dest
Name type value
----------------------------------------------------------------------------
Diagnostic_dest string D:/APP/Administrator
If the location of the initialization parameter is not set and the oracle_base environment variable is set, ORACLE_HOME/log is diagnostic_dest if oracle_base is not set.
Some log lists in this directory:
D:/APP/Administrator/diag> dir
2010/05/21 21:00 <dir> ASM
2010/05/27 16: 55 <dir> clients
2010/05/21 21:00 <dir> CRS
2010/05/21 21:00 <dir> diagtool
2010/05/21 21:00 <dir> LSNRCTL
2010/05/21 21:00 <dir> netcman
2010/05/21 21:00 <dir> ofm
2010/06/07 13:56 <dir> RDBMS
2010/05/21 21:00 <dir> tnslsnr
0 files, 0 bytes
21,367,534,592 available bytes in 11 Directories
The location of the Alert Log File parent directory is:
Adr_base/diag/product_type/product_id/instance_id
This directory contains subdirectories such as alert, trace, and bdump.
Alert Log XML file location:
SQL> select value from V $ diag_info where name = 'diag alert ';
Value
---------------------------------------------------------------
D:/APP/Administrator/diag/rdbms/mynewccs/Alert
Alert Log text file location:
SQL> select value from V $ diag_info where name = 'diag trace ';
Value
---------------------------------------------------------------
D:/APP/Administrator/diag/rdbms/mynewccs/Trace
------------------------------------------------------------------------------
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