Optimizer_mode For 11R2
Last updated on SEPTEMBER 24, 2016
Applies to:Oracle Communications Billing and Revenue Management - Version 184.108.40.206.0 and later
Information in this document applies to any platform.
*** Checked for relevance on 09-05-2014 ***
Checked for relevance on 09-Feb-2016.
The user is upgrading to 11gR2 DB. What is the recommended value for the parameter "optimizer_mode"?
As per Oracle DB documentation, three values are possible:
The optimizer uses a cost-based approach and optimizes with a goal of best response time to return the first
n= 1, 10, 100, 1000).
The optimizer uses a mix of costs and heuristics to find a best plan for fast delivery of the first few rows.
all_rows (default value)
The optimizer uses a cost-based approach for all SQL statements in the session and optimizes with a goal of best throughput (minimum resource use to complete the entire statement).
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