This chart tracks the cache hit ratio. This is the percentage of time the server finds an available plan in cache. Keeping a high cache hit ratio for procedures in cache reduces I/O and improves performance.
It is important to minimize the number of procedure reads from disk, particularly in any production environment. When a user needs to execute a stored procedure (or trigger), Adaptive Server should be able to find an unused tree or plan in the procedure cache for the most common procedures.
The Cache Hit Rate metric should be used to help decide the most effective size for the procedure cache. Increasing the size of the procedure cache will typically improve the Cache Hit rate.
