Mohamed Houri’s Oracle Notes

August 12, 2015

Adaptive Cursor Sharing triggering mechanism

Filed under: cursor sharing — hourim @ 10:08 pm

Inspired by Dominic Brooks’ last post on SQL Plan Management choices, I decided to do the same work about my thoughts on Adaptive and Extended Cursor Sharing triggering mechanism:

ACS triggering diagramOnce a cursor is bind aware and subject to an eventual plan optimization at each execution keep a careful eye on the number of cursors the Extended Cursor Sharing Layer are going to produce

3 Comments »

  1. Looks good

    Comment by Dom Brooks — August 13, 2015 @ 9:21 am | Reply

  2. […] introduced by Oracle starting from release 11g. Simply put, this feature aims to compile, for a bind aware cursor, an optimal execution plan for each query execution. Extensive details about this feature can be […]

    Pingback by Why my execution plan has not been shared – Part I - Oracle - Oracle - Toad World — April 26, 2016 @ 8:46 pm | Reply

  3. […] In order for the above sql_id to be bind aware and get a new optimal execution plan at each execution, it needs to be executed once again (more details can be found here): […]

    Pingback by AWR and superfluous historical statistics | Mohamed Houri’s Oracle Notes — September 28, 2016 @ 6:11 pm | Reply


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