[INTERFACES] JDBC - speed with big 'select's
От | Simon Hardingham |
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Тема | [INTERFACES] JDBC - speed with big 'select's |
Дата | |
Msg-id | 2DB2D9CD27AED211894500A0C92A02ED148FEE@sauron.netxtra.net обсуждение исходный текст |
Список | pgsql-interfaces |
Hi, Having just read the results of the post concerning INSERT times, I thought I should ask a related question that has been causing me some problems. I have a servlet which performs a SELECT which returns up to 6000 rows. These contain just 6 ints and need to be read to perform a specialised search. The query run's pretty quick, less than a second (although the time to display is much longer), using the psql interface. Therefore I assume the majority of the time the servlet requires is repeated calls to rs.next() and then the requests for each of the fields across the socket connection. JDBC 2.0 has a setFetchSize() function which looks as though it may allow me to transfer the results in larger chunks, but I am shooting in the dark really. Any suggestions as how I might speed this whole thing up, the INSERT trick by using COPY FROM STDIN got me thinking there may be other alternatives. Unfortunately I can not perform the selection using a more selective SELECT statement. Many thanks in advance Simon _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ _/ Simon Hardingham - netXtra Ltd - UK _/ _/ Tel: +44 (0) 1787 319393 Fax: +44 (0) 1787 319394 _/ _/ http://www.netxtra.co.uk simon@netxtra.co.uk _/ _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ ************
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