Using Memory Advisor through OEM

2. Automatic Shared Memory Management has to be disabled to run the advisor. Choose shared pool or buffer cache and click Advice next to it.

Figure 6.3 - Memory Advice

The corresponding graphs appear as shown below.

For Shared Pool size, the graph shows that a shared pool size larger than 60 MB will not improve performance a lot. So the recommended optimal shared pool size is 60 MB.

Figure 6.4 - Memory Advice

Figure 6.5 - Memory Advice

For Buffer Cache, the graph shows that a buffer cache size larger than 52MB will not improve the performance much either. A bigger cache prompts less disk reads and improves the performance. See Guru Conversation for more details.

3. To run the PGA Advisor, click on the PGA property page. This is similar to running the SGA advisors. Cache hit percentage is plotted against memory size. Higher hit ratios in the range of 75% to 100% indicate better cache performance.

Figure 6.6 - PGA Memory

Figure 6.7 - PGA Memory