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Best Practices for Gathering Optimizer Statistics with Oracle Database 12c Release 2 O R A C L E W H I T E P A P E R | J U N E 2 0 1 7 BEST Practices FOR Gathering Optimizer Statistics WITH ORACLE DATABASE 12C RELEASE 2 Table of Contents Introduction 1 How to Gather Statistics 1 When to Gather Statistics 7 Assuring the Quality of Optimizer Statistics 11 Gathering Statistics More Quickly 13 When Not to Gather Statistics 16 Gathering Other Types of Statistics 18 Conclusion 20 References 21 1 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.
2 BEST PRACTICES FOR GATHERING OPTIMIZER STATISTICS WITH ORACLE DATABASE 12C RELEASE 2 To check what preferences have been set, you …
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