[jboss-user] [JBoss Cache] - Index on JDBCCacheLoader

[Maurizio Mauri]

Maurizio Mauri [http://community.jboss.org/people/maurizio.mercatis] created the discussion

"Index on JDBCCacheLoader"

To view the discussion, visit: http://community.jboss.org/message/587257#587257

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Hi everybody!!


I have developed a cache component to support a web application with JBossCache and it works fine.


I have chosen a JDBCCacheLoader to deal with persistence activities. Now for a particular reason I have to schedule a task (during the night) that perform some activities on my contents tree.


To visit all my nodes I have set up a recursive function that perform this instruction "node.getChildren()" but it seems quite slow with lots of entries. I have placed an index on "FQN_parent" column to improve the performance and I have observed a great improvement (about 100 time).


Considering that JDBC retrieve metadata about index could it be a good idea to support this kind of activities?

<loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="true" ignoreModifications="false" purgeOnStartup="false">
          <properties>
                    cache.jdbc.table.name=jbosscache
                    cache.jdbc.table.create=true
                    cache.jdbc.table.drop=true
                    cache.jdbc.table.primarykey=jbosscache_pk
   <!-- cache.jdbc.table.index=ix_jbosscache -->
                    cache.jdbc.fqn.column=fqn
                    cache.jdbc.fqn.type=VARCHAR(255)
                    cache.jdbc.node.column=node
                    cache.jdbc.node.type=BLOB
                    cache.jdbc.parent.column=parent
                    cache.jdbc.driver=oracle.jdbc.OracleDriver
                    cache.jdbc.url=jdbc:oracle:thin:@localhost:1521:JBOSSDB
                    cache.jdbc.user=SCOTT
                    cache.jdbc.password=TIGER
          </properties>
</loader>
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