Okay thanks. What I was trying to do was setting the fetch size like in java.sql.ResultSet so rows aren't read one row at a time but many rows at a time instead. We experienced a higher performance executing a query with JDBC and using the fetch size feature. Without fetch size the JDBC query was as fast as the JPA query. In other words setting the fetch size in JDBC can speed up queries so JDBC is faster than JPA. So I searched the OpenJPA documentation for how to set the fetch size and thought FetchPlan.setFetchBatchSize() is what I need. But maybe this is something different? Isn't it possible to set the fetch size in OpenJPA 1.2.3?
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