Search notes:

oradebug doc event name emx_control

SQL> oradebug doc event name sql_trace
 
emx_control: event to control em express

Usage
-------
emx_control
   web_caching     < false | true >,
   compress_xml    < none | deflate | gzip | zlib2base64 >

See also

As per a comment in $ORACLE_HOME/perfhubrpt.sql, emx_control is used to turn off compression (?).

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