DNS (PI_DNS)
- Organization of this page
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 |
|
Over 10 Sec Collection Time |
No |
N |
ODBC key fields
PI_DNS_MSR_COND_ID
Lifetime
None
Record size
-
Fixed part: 681 bytes
-
Variable part: 180 bytes
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 10-2) |
AVG |
double |
No |
Probe Daemon |
The following figure shows the DNS sequence.
|
|
![[Figure]](GRAPHICS/ZUV09060.GIF)
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
-
RFC1034: Domain Names - Concepts and Facilities
-
RFC1035: Domain Names - Implementation and Specification
-
For the functions that are not compliance with RFCs and the restrictions, see the above notes.