Tanel Poder - Performance stories from Exadata Migrations

16,063 views
15,808 views

Published on

Tanel Poder has been involved in a number of Exadata migration projects since its introduction, mostly in the area of performance ensurance, troubleshooting and capacity planning.


These slides, originally presented at UKOUG in 2010, cover some of the most interesting challenges, surprises and lessons learnt from planning and executing large Oracle database migrations to Exadata v2 platform.

This material is not just repeating the marketing material or Oracle's official whitepapers.

Published in: Technology
1 Comment
10 Likes
Statistics
Notes
  • Tanel,

    Excellent slideshow!

    I'm migrating data into an Exadata machine with CTAS, and was getting only 3 meg/sec throughput on a particular table over a 1gigabit network. After some investigation, it turns out that the problem with the throughput is the way Oracle copies out of line LOBs over a database link...basically the CTAS will fetch the table rows in arrays but has to fetch each LOB one at a time in separate calls (see Bug 4438573 in Metalink). This creates an enormous amount of network calls each fetching a small amount of data (for our small LOBs, that is), and the sum of all the latencies trashes the throughput. Have you any workarounds for this issue?

    Glenn
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total views
16,063
On SlideShare
0
From Embeds
0
Number of Embeds
8,157
Actions
Shares
0
Downloads
30
Comments
1
Likes
10
Embeds 0
No embeds

No notes for slide

×