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Thursday, 6 December 2012

TRACEFILE_IDENTIFIER

This parameter is used specifies custom identifier with the oracle trace file format to identify a trace file simply from its name and without having to open it or view its contents. Generally when you enable tracing at a session level, you have to make a little bit of effort in digging out your session's trace file because in the user_dump_dest directory there would be so many other trace files, and all of them would have similar naming convention "SID_ora_nnnn.trc". Through the use of this parameter, you can easily distinguish your trace file. It is useful specifically when you want to use trace analyzer etc.
Enable Tracing:
Alter session set tracefile_identifier='sadhan_sql_trace';
Alter session set sql_trace=true;
Alter session set events ‘10046 trace name context forever, level 12’;
Now try to execute your queries and statements and check the user_dump_dest folder there you will find the file name "SID_ora_nnnn_sadhan_sql_trace.trc”.
Note: This parameter can only be used to change the name of the foreground process' trace file; the background processes continue to have their trace files named in the regular format. 
Disable Tracing:
Alter session set events ‘10046 trace name context off’;
Alter session set sql_trace=false;
You can directly find out the trace file name without using TRACEFILE_IDENTIFIER parameter though the SQL query.
select c.value || '/' || d.instance_name ||'_ora_' || a.spid || '.trc' trace
from v$process a, v$session b, v$parameter c, v$instance d
where a.addr = b.paddr
and b.audsid = userenv('sessionid')
and c.name = 'user_dump_dest';

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