Guido,
It's definitely the primary key fetch. We're saving batches of 100+
objects, where 90% of the objects are the same entity. It iteratively
calls the Oracle sequence to get them. Granted, Oracle is very fast
in doing this, but it's still adding up to a significant amount.
Thanks for the tips...
Ken
On Apr 25, 2008, at 1:12 PM, Guido Neitzer wrote:
On 24.04.2008, at 20:27, Ken Anderson wrote:
Does anyone have a cookbook on how to fetch more than one primary
key at a time from Oracle sequences? I know there are some DB plug-
ins that do this for you automatically, but it doesn't seem like
the Oracle plug-in does. Ideally, I would like to be able to set
the size of the batches by entity, but I'd settle for a way to at
least get more than one at a time... my insert performance is very
poor.
Maybe take a look at either:
- the PostgresqlPlugin which does this
- ERXLongPrimaryKeyFactory (you might get ideas from there)
- EOF generated primary keys (24 Byte binary)
But maybe your insert performance is poor for other reasons that
getting primary keys, which normally isn't too slow even with one
round-trip per row. Have you checked other options? Like do you have
expensive indexes on the tables?
And how do you define "poor"?
cug
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