RE: Bulk load on AS/400 DB2

Hi Xu.

Performance depends on your iSeries server
characteristics and workload as well as db2.

IF the % rows in the table for update or insert are
HIGH (eg 75% or more), my experience says creating a
separate table which might not have concurrent access
via views etc and then doing a batch insert to the
first table MIGHT improve performance.  

Even without that, performance isn't too bad in my
examples IF I use JDBC with prepared statements
correctly with a declared cursor for a positioned
update (vs searched).  Inserts are adding records to
the end of the table anyway.  

A big issue is the level of concurrent access,
isolation level and commitment control you want
enforced during the updates.  If this process can
occur at a predetermined time when other activity on
the table doesn't exist, performance should be
reasonable.

Of course you can always write a host program to do
the update directly using the DB2400 file access which
is usually faster.

Jim Mason

--- "Xu, Weining" <Weining.Xu@AIG.com> wrote:
> David,
> 
> I have very large amount of rows (~400,000) need be
> either updated or
> inserted into DB2 tables after the data are
> processed by a Java program.
> JDBC rs.updateRow() method performs update row by
> row. It takes a lot of
> times.  In inserting case, to execute insert SQL
> statement row by row also
> takes a lot of time.  I am thinking that may be I
> could save the results
> from Java program into a file and then loading this
> file into DB table at
> one time.  Any suggestions?  Thanks.
> 
> Wayne
> 
> -----Original Message-----
> From: David Gibbs [mailto:david@midrange.com]
> Sent: Thursday, February 13, 2003 9:41 AM
> To: java400-l@midrange.com
> Subject: Re: Bulk load on AS/400 DB2
> 
> 
> "Xu, Weining"
> <Weining.Xu=3YG79awXLjU@public.gmane.org> wrote in
> message
>
2775CED022F4D4119CF800902754B5AE06F4C4CE@xwilmbx01.aig.com">news:2775CED022F4D4119CF800902754B5AE06F4C4CE@xwilmbx01.aig.com...
> > Does anyone know how to perform bulk load on
> AS/400 DB2 V5R1?  Any
> > documentations?  Thanks.
> 
> Can you be more specific on what you mean by "Bulk
> Load"?  Are you talking
> about loading tables from an external source?
> 
> david
> 
> 
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