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In addition to the regular overtime graphs, the Statistics tab introduces capacity graphs. The capacity graph shows how a specific counter (CPU, Load, or Response Time) reacted when there was an increase in the number of active users or connected users, in the specified system.
Table 7- 1 Statistics tab
| View | Description |
|---|---|
| Viewing Scalability statistics | The Scalability view shows the CPU usage and the average response time parameters, over the specified time period. |
| Viewing Operating system statistics | The Operating System view displays statistics for the selected system or server, over the selected time period. |
| Viewing Usage statistics | The Usage view displays active users vs. connected users, over the selected time period. This shows how many users are connected (active and not active) and how many users are active in your SAP system. The Steps and Average Response Time provide additional information on the usage of your system. These graphs enable you to observe the connection between the active SAP users and the steps they created. |
| Viewing CPU capacity statistics | The CPU Capacity view displays the CPU vs. active users and CPU vs. connected users capacity graphs. This enables you to check how the server’s CPU performance was affected when additional users were added to the system. |
| Viewing response time capacity statistics | The Response Time Capacity view displays the Response Time vs. active users Response Time vs. connected users capacity graphs. This enables you to check how the server’s response time was affected when additional users were added to the system. |
| Viewing load capacity statistics | The Load Capacity view displays the Load vs. active users and Load vs. connected users capacity graphs. This enables you to check how the load on the server was affected when additional users were added to the system. |
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The following table describes the information contained in each of these tabs.
Table 7- 2 Association area tabs
| Tab | Description |
|---|---|
| General | Shows the basic counters for the activity. |
| HitRatio | Shows the most common HitRatio information for this server. |
| Application Server | Shows application server resources information. |
| CPU | Shows CPU consumption on this server. |
| Memory | Shows memory consumption on this server. |
| Paging | Shows paging activity information on this server. |
The following table describes the information displayed in the General tab.
Table 7- 3 General tab
| Column | Description |
|---|---|
| Active Users (Avg) | Displays the average active users (in 5-minute time slices). |
| Connected Users (Avg) | Displays the average active users (in 5-minute time slices). |
| CPU (Avg) | Displays the average CPU usage on the server (in 5-minute time slices). |
| CPU (Max) | Displays the maximum CPU usage on the server. |
| Load (Avg) | Displays the average load on the server, that is, processes waiting for the CPU (in 5-minute time slices). |
| Load (Max) | Displays the maximum load on the server. |
| Page Faults | Displays the number of page faults logged for the server when an attempt was made to access a page of memory that is not currently mapped to physical memory. |
| Response Time (Avg) | Displays the server’s average response time. |
| Transactions | Displays the number of transactions run by the server. |
The following table describes the information displayed in the HitRatio tab.
Table 7- 4 HitRatio tab
| Column | Description |
|---|---|
| Select Single Count (Avg) | Number of requests for a single sequential read from the database. |
| Select Single HitRatio | Percentage of single select requests data found in memory buffers. |
| Select Count (Avg) | Number of requests for sequential reads from the database. |
| Select HitRatio | Percentage of select requests data found in memory buffers. |
| Program HitRatio | Percentage of program code found in memory buffers. |
| Screen HitRatio | Percentage of screen code found in memory buffers. |
The following table describes the information displayed in the Application Server tab.
Table 7- 5 Application Server tab
| Column | Description |
|---|---|
| Session Count (Avg) | Total number of sap sessions on the host. |
| Roll Area Total (Avg) | Total size of roll area defined for this host. |
| Roll Area Used (Avg) | Total roll area used for this host. |
| Extended Memory Total (Avg) | Extended memory defined for this host. |
| Extended Memory Used (Avg) | Extended memory used for this host. |
The following table describes the information displayed in the CPU tab.
Table 7- 6 CPU tab
| Column | Description |
|---|---|
| Interrupts (Avg) | Number of operation system interrupts on this host. |
| System Calls (Avg) | Number of system calls made on this host. |
| Context Switches (Avg) | Number of operating system context switches made on this host. |
| User Mode CPU (%) | Percentage of user mode CPU usage on this host. |
| System Mode CPU (%) | Percentage of system mode CPU usage on this host. |
| Idle mode CPU (%) | Percentage of idle mode CPU usage on this host. |
The following table describes the information displayed in the Memory tab.
Table 7-7 Memory tab
| Column | Description |
|---|---|
| Free Memory KB (Avg) | Size of memory not used on the host. |
| Physical Memory KB (Avg) | Size of physical memory on the host. |
| Swap Config KB (Avg) | Swap area size configured for this host. |
| Swap Free KB (Avg) | Size of free swap area. |
| Swap Size KB (Avg) | Swap area size defined. |
| Swap MAX KB (Avg) | Maximum swap size area used. |
The following table describes the information displayed in the Paging tab.
Table 7- 8 Paging tab
| Column | Description |
|---|---|
| Page in/s (Avg) | Number of pages swapped in. |
| Page out/s (Avg) | Number of pages swapped out. |
| Page in/s KB (Avg) | Size of pages swapped in. |
| Page out/s KB (Avg) | Size of pages swapped out. |
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You can examine the capacity of your SAP system by viewing the capacity graphs in the Statistics tab. You can view CPU capacity, Load capacity or Response Time capacity. Unlike the overtime graph a capacity graph lets you determine how a specific counter (CPU, Load, Response time) reacted when there was an increase in the number of connected users or the number of active users. For example, if the number of active users reached 100 the CPU counter increased considerably to 90%, this may suggest that letting more users connect to this particular server may eventually bring the CPU to 100% and thereby slow down all the users working on this server.
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