What is the difference between setMaxRows(int) and SetFetchSize(int)? Can either reduce processing time?

Alessandro A. Garbagnati

setFetchSize(int) defines the number of rows that will be read from the database when the ResultSet needs more rows. The method in the java.sql.Statement interface will set the 'default' value for all the ResultSet derived from that Statement; the method in the java.sql.ResultSet interface will override that value for a specific ResultSet. Since database fetches can be expensive in a networked environment, fetch size has an impact on performance.

setMaxRows(int) sets the limit of the maximum nuber of rows in a ResultSet object. If this limit is exceeded, the excess rows are "silently dropped". That's all the API says, so the setMaxRows method may not help performance at all other than to decrease memory usage. A value of 0 (default) means no limit.

Since we're talking about interfaces, be careful because the implementation of drivers is often different from database to database and, in some cases, may not be implemented or have a null implementation. Always refer to the driver documentation.

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