DNS (PI_DNS)
Function
The DNS (PI_DNS) record stores information about DNS service response time. This is a multi-instance record.
Default and changeable values
Item | Default value | Changeable |
---|---|---|
Collection Interval | 360 | Y |
Collection Offset | 0 | Y |
Log | No | Y |
LOGIF | (Blank) | Y |
ODBC key fields
PI_DNS_MSR_COND_ID
Lifetime
None
Record size
Fields
View name (Manager name) | Description | Summary rule | Format | Delta | Data source |
---|---|---|---|---|---|
Total Amount of Data (TOTAL_DATA_SIZE) | Total amount of data transferred between the DNS probe and the measurement-target server on UDP (bytes) | AVG | double | No | Probe Daemon |
Total Response Time (TOTAL_RESP_TIME) | Total response time (seconds) ((1) in Figure 9-2) | AVG | double | No | Probe Daemon |
The following figure shows the DNS sequence.
Figure 9-2 DNS sequence
DNS operating environment and notes
A DNS probe queries the DNS server for the IP address of the specified search-target host name, and measures the time required for receiving the response.
The following describes and provides notes on a DNS operating environment.
Retry timeout value
The retry timeout value is determined automatically by the following formula:
Retry timeout value = timeout value/(retries count + 1)
Resolution of search-target host name
Measurement fails if the IP address cannot be obtained due to an error in resolving the search-target host name.
RFC compliance