Re: How to speed-up inserts with jdbc

couple of things

1) That is a fairly old version of postgres, there are considerable
performance improvements in the last 2 releases since, and even more in
the pending release.
2) If you are going to insert more rows than that, consider dropping the
index before, and recreating after the insert.

Dave

Michael Kleiser wrote:

> Im PostgreSQL 7.2.2 / Linux 2.4.27 dual-processor Pentium III 900MHz,
>
> we have this table:
>
> create table testtable (id SERIAL PRIMARY KEY, coni VARCHAR(255), date
> TIMESTAMP, direction VARCHAR(255), partner VARCHAR(255), type
> VARCHAR(255), block VARCHAR(255) );
>
>
> We using Java with JDBC-driver pg72jdbc2.jar
>
>
> our Java-testgrogram is :
>
>
> public class Stresser implements Runnable {
> public void run() {
> System.out.println("-> start");
> try {
>
> Class.forName("org.postgresql.Driver");
> Connection con =
> DriverManager.getConnection("jdbc:postgresql://"+prop.getProperty("host")+":"+prop.getProperty("port")+"/"+prop.getProperty("dbname"),
> prop.getProperty("user"), prop.getProperty("pwd"));
> con.setAutoCommit(true);
> Statement st = con.createStatement();
> java.sql.Timestamp datum = new java.sql.Timestamp(new
> Date().getTime());
> Date start = new Date();
> System.out.println(start);
> for (int i=0; i<100; ++i) {
> st.executeUpdate("insert into
> history(uuid,coni,date,direction,partner,type)
> values('uuid','content','"+datum+"','dir','partner','type')");
> }
> Date end = new Date();
> System.out.println(end);
> con.close();
> } catch (Exception e) {
> System.out.println("Exception!");
> e.printStackTrace();
> }
> System.out.println("-> ende");
> }
>
> public static void main(String[] args) {
>
> for (int i=0; i<10; ++i) {
> Stresser s = new Stresser();
> Thread t = new Thread(s);
> t.start();
> }
> }
> }
>
>
> It is trunning in in 10 Threads. Each thread makes 100 Inserts:
>
> For the 1000 Inserts (10 threads a 100 inserts)
> we need 8 seconds.
> That's 125 Insets / Seconds.
>
> How could we make it faster ?
>
> Inserting 1000 rows via INSERT AS SELECT is much faster.
>
> regards
> Michael
>
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>

--
Dave Cramer
http://www.postgresintl.com
519 939 0336
ICQ#14675561