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Best Practices for Gathering Optimizer Statistics ... - Oracle
www.oracle.com2 WHITE PAPER / Best Practices for Gathering Optimizer Statistics with Oracle Database 19c INTRODUCTION The Oracle Optimizer examines all of the possible plans for a SQL statement and picks the one with the lowest cost, where cost represents the estimated resource usage for a given plan.
Best Practices for Gathering Optimizer Statistics ... - Oracle
www.oracle.com4 BEST PRACTICES FOR GATHERING OPTIMIZER STATISTICS WITH ORACLE DATABASE 12C RELEASE 2 ESTIMATE_PERCENT The ESTIMATE_PERCENT parameter determines the percentage of rows used to calculate the statistics. The most accurate statistics are gathered when all rows in the table are processed (i.e. a 100% sample), often referred to as computed …