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Don Burleson Blog 







Extended cursor_sharing tips

Oracle Database Tips by Donald BurlesonFebruary 12, 2013

Question:  What is extended cursor_sharing (ECS), and how does extended cursor_sharing differ from adaptive cursor_sharing?

Answer:  The extended cursor_sharing (ECS) working with adaptive cursor_sharing to allow real-time bind peeking to see if the bind variable value influences the execution plan for the SQL statement,

See these important notes on adaptive cursor_sharing and also see my note on the bind_aware hint

According to the Oracle optimizer group. "Bind Aware Cursor Sharing" (BASC) is a complex technology that consists of Adaptive Cursor Sharing (ACS) and Extended Cursor Sharing (ECS) technologies:

  • Adaptive cursor_sharing monitors queries where extended cursor_sharing is "applicable" (e.g. binds were peeked, predicate shape).
  • Adaptive cursor_sharing identify queries with variable data volume.
  • Adaptive cursor_sharing requires you to enable extended. cursor_sharing (bind_aware hint).

According to Oracle, if any of the following checks fail, extended cursor_sharing will be disabled:

  • other hints are used in the query
  • Stored outlines (plan stability) is in-use
  • There are more than 14 binds in the SQL statement
  • Parameters such as bind_peeking=false is set
  • The release of Oracle does not support extended cursor sharing

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