Difficulty of fix DBA Performance Tuning applications

Hello
I had an interview, which the DBA team leader asked me about my expereince of performance

I met on my expereince in the sqls of tuning and get a good statistic so the CBO choose the best plan, or even hint my sqls so I force the best plan

the interviwer was worried because he is an application development, does not a DBA tuning
mention of He that he wanted to hear that I've changed a setting db that improve performance, or change something in the DBA team that optimize performance

Does anyone have an example of changing the setting or something DBAish that helps the performance?

Thanks for any input

Index rebuild or change the block size?

(game of lights and stands back)

Choose a parameter, a parameter, for example:
How about increasing size of log file to reduce log file switches?
With the help of async_io?
Change of db_multiblock_io_count, optimizer_index_adj.
Going between manual and automatic memory management.
The fast setting = true ;) etc, etc.

Tags: Database

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