Posts tagged Jonathan Lewis
A little while ago, Jonathan Lewis presented a three day seminar in The Netherlands. You may have read other blogs on this site about this seminar. AMIS had sent six people to attend. And yes, I was one of the lucky ones too. Although the seminar should be for developers and DBA’s, most of its content was aimed at DBA’s. As a developer I don’t think undo, redo and latches are very interesting. But there were enough nice things to make the seminar very useful. For instance
- A nice example of how the way/order which records are inserted into a table can have impact on the performance of retrieving the data, due to differences in the clustering factor of the data/indexes.
- An other example of querying simular datasets (in the same way), but with huge performance differences, if you are unlucky with some internal hash functions of Oracle.
- A working example of the "go_faster" hint
- A nice trick to get the DBA-role, see http://www.red-database-security.com/exploits/oracle_sql_injection_oracle_dbms_metadata.html
- and much more