Updating selfpopulatingcache example
The other thing to keep an eye on is how much the cache has no size limit – in theory, it could fill up your entire file system, particularly if you have your objects marked as eternal (which means they will never expire). Let’s go for a simple example: I have an Order object, which contains 3 Order Items.
Order Item, in turn, has a reference back to Order.
Simply put: you should have the Memory Store large enough that it covers the bulk of the items you want cached.
The bottom line is Eh Cahe is using the same amount of memory as a Hash Map!Ehcache provides a number of ways to size the different data tiers using simple cache-configuration sizing attributes.These sizing attributes affect local memory and disk resources, allowing them to be set differently on each node.（翻译：调谐Ehcache常常涉及sizing cached 数据的合适性。Ehcache提供了大量的方式配置不同的数据层的大小,使用简单的cache-configuration sizing 属性。这些 sizing 属性会影响本地内存和磁盘资源,对于每个节点允许它们设置不同。） 使用ehcache向cache取值与设值示例1：public class My Data Access Class 示例3：EHCache Utils.javapackage com.ttpod.cache; /*** @class Description:ehcache工具类*/ public class EHCache Util EHCache Config.javapackage com.ttpod.cache;/*** @class Name: EHCache Config.java* @class Description:*/public class EHCache Config hibernate中的二级缓存命名缓存查询In addition, a Query Cache can be given a specific name in Hibernate using Cache Region(String name).A low hit-to-miss ratio, for example, means that the cache is not that good.
Either it is too small, or there are no truly popular entries (caches work best if popularity is clustered), or the entries are expiring too fast.
We tested by using a simple hash Map and since the size could overshoot the heap size we wanted to ensure that we could control that.. If I use EHCache and limit the number of entries in the heap to 10 and local disk to 500000 it consumes 98MB. I was thinking that I should be able to see only a small amount of heap used since only 10 entries are in the heap.