Oracle : Difference between .trc and .trm

Oracle *.trm *.trc

A new type of files with .trm extension are created in ADR_HOME/trace directory in Oracle 11g databases. The following are some facts:

• From 11g onwards, all the trace files are found in ADR_HOME/trace directory.
• There is usually one “.trm” file for each “.trc” file.
• The files located in the TRACE directory, with the “.trm” extensions, are called Trace
• Metadata files. The metadata in .trm files describe the trace records stored inside of .trc trace files.
• The Trace metadata allows tools, such as ADRCI, to post process the trace information.
• By deleting the .trm file, you make the .trc file unusable for post processing from ADR using ADRCI tool.