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switch_for_call tips

Oracle Database Tips by Donald BurlesonJanuary 17, 2016

Question: I need to know what the switch_for_call does.  Can you explain on how to use switch_for_call inside dbms_resource_manager create_plan_directive?

Answer:  If switch_for_call = TRUE, then the total elapsed time is accumulated from the start of an Oracle call. Otherwise, the elapsed time is accumulated for the time length of the Oracle session.

The switch_for_call is useful for three-tier applications where the middle tier server is using session pooling (or shared servers, multithreaded server). A "top" call in PL/SQL is an entire PL/SQL block and it is treated as one individual call. A top call in SQL is each individual SQL statement.

The following PL/SQL block for dbms_resource_manager creates a resource plan directive for the OLTP group that temporarily switches any session in that group to the "low group" consumer group if the session exceeds 25,000 I/O requests or if it exceeds 3,000 MB of data transferred. In this case, the session is returned to its original group after the offending top call has completed.

See switch_elapsed_time.

Note: The switch_time_in_call parameter was deprecated in 12c and beyond in favor of the combination of switch_time and switch_for_call.

BEGIN
DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE (
PLAN => 'DAY_MODE',
GROUP_OR_SUBPLAN => 'OLTP',
COMMENT => 'OLTP group',
MGMT_P1 => 75,
SWITCH_GROUP => 'LOW_GROUP',
SWITCH_IO_REQS => 30000,
SWITCH_IO_MEGABYTES => 2500,
SWITCH_FOR_CALL => TRUE);
END;

   
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