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DSS Sizing and Tuning of Oracle8 for Windows NT on CompaqServers Page 3
1024. The Windows NT Performance Monitor displays the process (ORACLE80) and threads
(Threads 0,1 represent the Oracle service threads). If ARCHIVELOG mode is enabled, threads
2,3,4,5,6,7,8
represent the background threads [PMON, DBWR, ARCH, LGWR, CKPT, SMON and RECO
respectively]. If ARCHIVELOG mode is not enabled, threads 2,3,4,5,6,7 represent the
background threads [PMON, DBWR, LGWR, CKPT, SMON and RECO respectively] as shown
in Figure 1. The process ID for each thread is listed in the "Last", "Average", "Min" and "Max"
boxes in Performance Monitor. Descriptions of each background thread can be found in Figure
3.
Figure 1: Performance Monitor – Oracle8 Server process and threads
The Oracle8 Server process is represented under Windows NT as a service (OracleServiceSSSS
[SSSS= System ID]) associated with the executable ORACLE80.EXE. The Oracle Service
consists of two threads, 0 and 1. Thread 0 is the Oracle process main thread acting as a service
dispatcher and creating thread 1 to handle the service.
Each Oracle instance is associated with a specific Windows NT service and consists of a single
process and multiple threads. Use the Windows NT Control Panel/Services to display the Oracle
Services. OracleServiceTPCD represents the Oracle Instance TPCD as shown in Figure 2.
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