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

ItemDefault valueChangeable
Collection Interval360Y
Collection Offset0Y
LogNoY
LOGIF(Blank)Y

ODBC key fields

PI_DNS_MSR_COND_ID

Lifetime

None

Record size

Fields

View name
(Manager name)
DescriptionSummary ruleFormatDeltaData 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)AVGdoubleNoProbe Daemon
Total Response Time
(TOTAL_RESP_TIME)
Total response time (seconds) ((1) in Figure 9-2)AVGdoubleNoProbe Daemon

The following figure shows the DNS sequence.

Figure 9-2 DNS sequence

[Figure]

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