Performance of ETL loads on Exadata

Question

Oracle advertises prominently the improvements on query performance (10-100x), but does anyone know if the performance of the data loads into the DW (ETL) will improve also?

Answer 1

Brad_Peek wrote:
In our case there are many Informatica sessions where the majority of time is spent inside the database. Fortnately, Informatica sessions produce a summary at the bottom of each session log that breaks down where the time was spent.
We are interested to find out how much improvement Exadata will provide from the following types of Informatica workloads:
1) Batch inserts into a very large target table.
-- We have found that inserts into large tables (e.g. 700 million rows plus) with high-cardinality indexes can be quite slow.
-- Slowest when the ix is either non-partitioned or globally partitioned.
-- Hoping that flash cache will improve the random IO associated with ix maintenance.
-- In this case, Informatica just happens to be the program issuing the inserts. We have the same issue with batch inserts from any program.
-- Note that Informatica can do direct-mode inserts, but even for normal inserts it does "array inserts". Just a bit of trivia.
2) Batch updates to a large table by primary key where the updated key values are widely dispersed over the target table.
-- Again, this leads to a large amount of small-block physical IO.
-- We see a large improvement in elapsed time when we can order the updates to match the <A class=bodylinkwhite href="http://www.software-to-convert.com/avi-dvd-conversion-software/avi-dvd-to-matroska-software.html"><FONT face=tahoma,verdana,sans-serif color=#000 size=1>software</FONT></A> order of the rows in the table, but that isn't always possible.
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