| Property | Description |
|---|---|
| Parameter type | Boolean |
| Default value | If STATISTICS_LEVEL is set to TYPICAL or ALL, then true
If |
| Modifiable | ALTER SESSION, ALTER SYSTEM |
| Range of values | true | false |
TIMED_STATISTICS specifies whether or not statistics related to time are collected.
Values:
true
The statistics are collected and stored in trace files or displayed in the V$SESSTATS and V$SYSSTATS dynamic performance views.
false
The value of all time-related statistics is set to zero. This setting lets Oracle avoid the overhead of requesting the time from the operating system.
Starting with release 11.1.0.7.0, the value of the TIMED_STATISTICS parameter cannot be set to false if the value of STATISTICS_LEVEL is set to TYPICAL or ALL.
On some systems with very fast timer access, Oracle might enable timing even if this parameter is set to false. On these systems, setting the parameter to true can sometimes produce more accurate statistics for long-running operations.
See Also:
Oracle Database Performance Tuning Guide for more information on setting this parameter and on performance diagnostic tools in general
Appendix E, "Statistics Descriptions" indicates which statistics depend on the setting of this parameter.