SQL_TRACE

Property	Description
Parameter type	Boolean
Default value	`false`
Modifiable	`ALTER SESSION`, `ALTER SYSTEM`
Range of values	`true \| false`

SQL_TRACE enables or disables the SQL trace facility. Setting this parameter to true provides information on tuning that you can use to improve performance. You can change the value using the DBMS_SYSTEM package.

Caution:

Using this initialization parameter to enable the SQL trace facility for the entire instance can have a severe performance impact. Enable the facility for specific sessions using the ALTER SESSION statement. If you must enable the facility on an entire production environment, then you can minimize performance impact by:

Maintaining at least 25% idle CPU capacity
Maintaining adequate disk space for the USER_DUMP_DEST location
Striping disk space over sufficient disks

See Also:

Oracle Database Performance Tuning Guidefor more information about performance diagnostic tools