[Solr Wiki] Update of "DataImportHandlerFaq" by ShalinMangar

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The following page has been changed by ShalinMangar:
http://wiki.apache.org/solr/DataImportHandlerFaq

The comment on the change is:
Adding note on 1.4 specific feature

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  If you are using multiple Solr indexes (or multiple cores) in the same Solr webapp, each core will run a separate instance of DataImportHandler and each core should have its own data-config.xml file in the conf directory. See MultipleIndexes for more details on using multiple indexes.
  
  === Running Out of Memory with Postgresql ===
+ <!> ["Solr1.4"]
  No more memory issues with this data source configuration:
  {{{
  <dataSource type="JdbcDataSource" driver="org.postgresql.Driver" url="jdbc:postgresql://host/db" user="user" password="password" readOnly="true" autoCommit="false" transactionIsolation="TRANSACTION_READ_COMMITTED" holdability="CLOSE_CURSORS_AT_COMMIT"/>