How I load all the data in a database table into a cache?

Question

Hi
Lets assume I have a lookup table I want to load it upfront into the cache so that the application can use this data from cache. One way is to write code to create a map from the database and call putALL. Is there any better approach to this?
Another thing is if the data is more than 1 GB and if I construct a map of one GB before putting it into the cache the JVM might crash. The question is how do I distribute upront loading of the cache to multiple JVMs. Do I have to use invocation service or is there any thing out of box.

Answer 1

I only use one JVMs and I use a distributed cache, the configuration XML file like this:
<p> <distributed-scheme>
<scheme-name>default-distributed</scheme-name>
<service-name>DistributedCachestore</service-name>
<backing-map-scheme>
<read-write-backing-map-scheme>
<scheme-ref>example-read-write</scheme-ref>
</read-write-backing-map-scheme>
</backing-map-scheme>
     <listener-scheme> </listener-scheme> 
     <autostart>true</autostart>
</distributed-scheme>
<read-write-backing-map-scheme>
<scheme-name>example-read-write</scheme-name>
<internal-cache-scheme>
<local-scheme>
<scheme-ref>default-eviction</scheme-ref>
<high-units>50050</high-units>
<low-units>40000</low-units>
<expiry-delay>3600</expiry-delay> 
</local-scheme>
</internal-cache-scheme>
<cachestore-scheme>
<class-scheme>
<scheme-ref>example-cachestore</scheme-ref>
</class-scheme>
</cachestore-scheme>
<read-only>false</read-only>
<write-delay-seconds>0</write-delay-seconds>
</read-write-backing-map-scheme>
<!-- 
CacheStore test definition 
-->
<class-scheme>
<scheme-name>example-cachestore</scheme-name>
<class-name>com.tangosol.examples.coherence.DBCrudStore</class-name>
<init-params>
<init-param>
<param-type>java.lang.String</param-type>
<param-value>cachec</param-value>
</init-param>
</init-params>
</class-scheme></p>
The data in my table will reach about 1000000+ and I want to load about 50000 into cache.
Thanks.