Performance Monitor keeps track of the Hypertext Transfer Protocol (HTTP) as used by the WWW service and File Transfer Protocol (FTP) service. Counters in Performance Monitor produce statistical information on the processor, memory, cache, network, and other object types. Phone Book Service relies on the counters for WWW services. For more information about performance counters, see the Windows NT Resource Kit.
The following table lists Phone Book Service Performance Monitor counters.
| Name | Description |
| Delta Upgrade Hits | The total number of delta phone book files that have been successfully downloaded. |
| Delta Upgrade Hits/Sec | The number of delta phone book files that are successfully downloaded per second. |
| Error Hits | The total number of requests that could not be satisfied by the Phone Book Service. |
| Error Hits/Sec | The number of requests per second that could not be satisfied by the Phone Book Service. |
| Full Upgrade Hits | The total number of full phone book files that have been successfully downloaded. |
| Full Upgrade Hits/Sec | The number of full phone book files that are successfully downloaded per second. |
| No Upgrade Hits | The total number of requests for phone book files that did not require an update to the phone book file on the user’s computer. |
| No Upgrade Hits/Sec | The number of requests for phone book files per second that do not require an update to the phone book file on the user’s computer. |
| Total Hits | The total number of requests for phone book files. |
| Total Hits/Sec | The number of requests per second for phone book files. |