Oracle Database 11 g - Online Public Access Catalog

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202 CHAPTER 4 ■ PERFORMANCE MANAGEMENTYou can monitor expression statistics with the DBA_STAT_EXTENSION view, and you candrop the extension statistics from a table with the drop_extended_statistics function of theDBMS_STATS package.Changing Statistics PreferencesIn Oracle Database 10g, you used the DBMS_STATS package’s GET_PARAM function to return thedefault values of parameters for several procedures that belong to the DBMS_STATS package. TheGET_PARAM procedure is obsolete in Oracle Database 11g. Instead, there is a more powerful newfunction called GET_PREFS, which will get you the default values of various preferences. TheGET_PREFS function has parameters such as cascade, degree, estimate_percent, granularity,publish, and stale_percent, each of which is called a preference. Here’s an example of how youcan use the get_prefs function to get the preferences for a certain parameter, in this case thestale_percent parameter:SQL> select dbms_stats.get_prefs('stale_percent','sh','product_descriptions')stale_percent from dual;STALE_PERCENT------------------------20If you provide the schema, the table name, and a preference, the previous function willreturn the values specified for that table. If you don’t specify any values for that table, the functionwill return the global preference, if you specified one. If you don’t specify either a globalpreference or a table specific preference, the function will return the default values for thatpreference.Setting PreferencesThe set_param procedure that enabled you to set default parameter values for various DBMS_STAT procedures in the previous version of the Oracle database is now obsolete. Instead, thereis a new procedure, set_global_prefs, that lets you set global statistics preferences for thevarious parameters. You need the sysdba privilege to set global preferences using the set_global_prefs procedure.The following example shows how to use the set_global_prefs procedure:SQL>exec dbms_stats.set_global_prefs('estimate_percent','70');PL/SQL procedure successfully completed.SQL>Confirm the change in the estimate_percent parameter’s value in the table product_descriptions by using the following query:
CHAPTER 4 ■ PERFORMANCE MANAGEMENT 203SQL> select dbms_stats.get_prefs ('estimate_percent', 'oe','product_descriptions') estimate_percent from dual;ESTIMATE_PERCENT------------------------------70SQL>The set_global_prefs procedure will set global preferences for all parameters you can setfor the various procedures of the DBMS_STATS package. You can also set the preferences at thedatabase level (set_database_prefs), schema level (set_schema_prefs), and individual tablelevel (set_table_prefs).Removing Statistics PreferencesYou can use new procedures of the DBMS_STATS package to delete current statistics preferences.Here are the different statistics preferences deletion procedures:• delete_table_prefs: Deletes statistics preferences for a specific table• delete_schema_prefs: Deletes statistics preferences for a specific schema• delete_database_prefs: Deletes statistics preferences for all tables in the database,other than those owned by OracleExporting and Importing Statistics PreferencesYou can also export statistics preferences at the database (export_database_prefs), schema(export_schema_prefs), or table (export_table_prefs) level. The following example exportsstatistics preferences at the database level:SQL> exec dbms_stats.export_database_prefs('hrtab',statown=>'hr');The previous procedure will export the statistics preferences of all tables (except those ownedby SYS) to the table hrtab. Similarly, you can import statistics preferences from a specified statisticstable where you first exported them at the database level (import_database_prefs), schema level(import_schema_prefs), or table level (import_table_prefs).Keeping Statistics Pending vs. Publishing Statistics ImmediatelyIn prior database versions, once the DBMS_STATS procedure (or the analyze command) collectedstatistics, the statistics were immediately offered for use by the cost optimizer. In other words,the publishing of the statistics was automatic. This is still the default behavior in Oracle Database11g, with the important distinction that you can now opt not to publish the statistics automatically,thus giving you an opportunity to test the new statistics to see whether they actually improvequery performance. You can view the default behavior regarding the publishing of statistics byusing the get_prefs function as shown here:
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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xxviii■INTRODUCTION• The flashb
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2 CHAPTER 1 ■ INSTALLING, UPGRADI
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 317DBA11g1
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 321Please b
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 7 ■ DATA PUMP 327Document
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CHAPTER 7 ■ DATA PUMP 329SQL> sel
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CHAPTER 7 ■ DATA PUMP 331SQL> sel
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 9■ ■ ■Storage Managem
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416 CHAPTER 10 ■ DATA GUARD• Lo
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446 CHAPTER 11 ■ APPLICATION DEVE
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CHAPTER 12■ ■ ■Data Warehousi
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566 ■INDEXadvise failure command,
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