Find ALert log Location

 The alert log is an XML file that is a the log of messages and errors.
Each alert log is specific to its component type, such as database, Oracle ASM, listener, and Oracle Clusterware.
For the database, the alert log includes messages about the following:

    Critical errors (incidents)
    Administrative operations, such as starting up or shutting down the database,
        recovering the database, creating or dropping a tablespace, and others.
    Errors during automatic refresh of a materialized view
    Other database events
    

Trace files are updated periodically over the life of the process and can contain information on the process environment,
 status, activities, and errors. In addition, when a process detects a critical error,
 it writes information about the error to its trace file.
 
 
 Using Find Command
 
 find $ORACLE_BASE -type f -name alert_$ORACLE_SID.log
 
 select value from GV$DIAG_INFO WHERE name='Diag Trace';
 
 find /opt/oracle -name alert*log

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