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Although you can use the ESTIMATE_PERCENT attribute to collect optimizer statistics for a sample ranging from 0.000001 to 100 percent of the rows in a table, you should strive to collect statistics for all the rows (by using null as the value for this attribute). Collecting statistics based on a sample is fraught with dangers. Unless the tables are so huge that you can t collect all statistics within your maintenance window, strive to collect full statistics on all objects, especially those that have heavy DML changes.
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Let me explain the preceding GATHER_DATABASE_STATS procedure briefly here: The example shows only some of the various attributes or parameters that you can specify. You can see the complete list of attributes by typing in this command: SQL> DESCRIBE DBMS_STATS.GATHER_DATABASE_STATS If you don t specify any of the attributes, Oracle uses the default values for those attributes. Even when I use a default value, I list the attribute here, for exposition purposes. The ESTIMATE_PERCENT attribute refers to the percentage of rows that should be used to estimate the statistics. I chose null as the value. Null here, contrary to intuition, means that Oracle collects statistics based on all rows in a table. This is the same as using the COMPUTE STATISTICS option in the traditional ANALYZE command. The default for this attribute is to let Oracle estimate the sample size for each object, using the DBMS_STATS.AUTO_SAMPLE_SIZE procedure. You can use the METHOD_OPT attribute to specify several things, including whether histograms should be collected. Here, I chose FOR ALL COLUMNS SIZE AUTO, which is the default value for this attribute. The GRANULARITY attribute applies only to tables. The ALL value collects statistics for subpartitions, partitions, and global statistics for all tables. The CASCADE=>YES option specifies that statistics be gathered on all indexes, along with the table statistics. The OPTIONS attribute is critical. The most important values for this attribute are as follows: GATHER gathers statistics for all objects, regardless of whether they have stale or fresh statistics. GATHER AUTO collects statistics for only those objects that Oracle deems necessary. GATHER EMPTY collects statistics only for objects without statistics. GATHER STALE results in collection of statistics for only stale objects, the determination as to the object staleness being made by checking the DBA_TAB_MODIFICATIONS view.
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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Note that you could also execute the GATHER_DATABASE_STATS procedure in the following format, which produces equivalent results: SQL> BEGIN dbms_stats.gather_database_stats (ESTIMATE_PERCENT => NULL, METHOD_OPT => 'FOR ALL COLUMNS SIZE AUTO', GRANULARITY => 'ALL', CASCADE => 'TRUE', OPTIONS => 'GATHER AUTO'); END; PL/SQL procedure successfully completed. SQL> You can check when a table has last been analyzed by using the following query: SQL> SELECT table_name, last_analyzed FROM dba_tables; TABLE_NAME ----------TEST1 TEST2 TEST3 . . . SQL> LAST_ANALYZED -------------07/08/2008 07/08/2008 07/08/2008
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You can use a similar query for indexes, using the DBA_INDEXES view.
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Tip Make sure you have the initialization parameter JOB_QUEUE_PROCESSES set to a positive number. If this parameter isn t set, it takes the default value of 0, and your DBMS_STATS.GATHER_SYSTEM_STATS procedure won t work. You can do this dynamically; for example, issue the command ALTER SYSTEM SET JOB_QUEUE_PROCESSES = 20.
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By default, the database publishes the statistics it collects for immediate use by the optimizer. However, there may be times when you don t want this to happen. Instead, you may wish to first test the statistics and release them for public use only if you re satisfied with them. Oracle lets you save new statistics collected by the database as pending statistics, which you can publish or not ultimately, based on your testing of the statistics. Current or published statistics are meant to be used by the optimizer, and pending or deferred statistics are private statistics, which are kept from the optimizer.
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