That would be cool if you have time for it.
Re the sequence: is it assigned in a trigger, or directly in the SQL?
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| AdamDonahue@maximus.com
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In the interests of documentation, and if I have time, I could engineer a
similar 'dumb' procedure, perform trace as each modification is made, and
post the results here. It's pretty easy to come up with an artificial
routine, though, to do this kind of analysis oneself. Use Tom Kyte's
BIG_TABLE approach, and then create a procedure to populate a separate
table using single-row inserts, and subsequently, an insert append.
Adam
Jared.Still@radisys.com
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Re: anyone use pipelined functions?
Fantastic results Adam.
You didn't perhaps do interim testing did you, so that you
know how much of the benefit was due to the pipelined functions?
You made quite a few changes, and a breakdown of the
the benefits of each would be interesting to see.
Jared
AdamDonahue@maximus.com
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I recently rewrote a poor-performing data load procedure (with single row
inserts, commit batches of 2000) to a pipelined table function, which
enabled insert /*+ append */ into the target table, which greatly enhanced
performance. The original routine contained an embedded select, a second
select using a top-level select key, and then a large loop with data
operations culminating with an insert of each row (and sequence value
generation). The routine took about four hours to run.
I joined the queries into a single inner join select, parallelized; added
a cache to the sequence (which had been set to zero); added a second index
to the source table to enable FFS; engineered the function to leverage
pipelining (moving the to an insert /*+ append */ into ... select * from
table( function ); made the requisite modifications to the target table,
and reran the load. The time came down to about 25 minutes. The total
work spent in engineering the procedure was about 2 hours, so the work put
into tuning it + its improved runtime came in at less than the total
original runtime! (Of course, this does not include reenabling
constraints, triggers, etc., but these things bring the total runtime up
to about ~1 hour in this case, still an improvement.)
The benefit-cost ratio here was quite high!
Adam
<ryan_oracle@cox.net>
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anyone use pipelined functions?
I read the little blurb in the 9i new features on it. The example there
doesnt seem very useful. What have people used it for?
any good articles with good examples on this?
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Received on Wed Dec 31 2003 - 13:29:34 CST
