First vertical bar
| A buffer cache size of 5,000 results in a hit ratio of 0.60. |
| Second vertical bar | Increasing the cache size to 6,000 buffers yields a large increase in the hit ratio, which is now 0.80. |
| Third vertical bar | Going up to 7,000 buffers yields a smaller increase, and the hit ratio is now 0.90. |
| Fourth vertical bar | Further increasing the cache to 8,000 buffers yields an even smaller increase, taking the hit ratio to 0.95. |
| Fifth vertical bar | Increasing the cache from 8,000 to 9,000 buffers results in no increase to the hit ratio. You should undo this change and run with an 8,000 buffer cache. |
