Catalog Cache Hitrate has fallen below 70 percent

Dear All,

In my SCM development system Catalog Cache Hitrate has fallen below 70 percent.

Kindly guide me to make it reach beyond 90 %.

Current parameters relevant are

Cat_cache_supply= 10000

Maxusertasks = 74

Cachememorysize=1024000

let me know if you need any further info.

Regards,

kiran