Search notes:

oradebug event

oradebug setospid 35020
oradebug event 942

Syntax of ORADEBUG EVENT

The syntax of the oradebug event command can be queried with 
SQL> oradebug doc event

Tracing wait events, showing call stack

SQL> oradebug setospid 19220
SQL> oradebug event wait_event["db file sequential read"] trace("stack is: %\n", shortstack())
SQL> oradebug tracefile_name

See also

Trace files
oradebug

Index