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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.

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

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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You get all the other advantages that come with the PL/SQL. For example, PL/SQL is tightly integrated with SQL, so you can easily mix SQL statements in PL/SQL code. You also get the benefit of implicit cursor caching provided by PL/SQL (this feature is discussed in 14). There is an exception where you may want to consider using PreparedStatement (or OraclePreparedStatement). This is when you bulk load a large amount of data into one or more tables from a source external to the database (e.g., a file visible to the client but not to the database server).

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.

Execute the DBMS_STATS.GET_PREFS procedure to determine the publishing status of statistics in your database: SQL> select dbms_stats.get_prefs('PUBLISH') publish from dual; PUBLISH -------TRUE SQL>

Note If the external data source is visible to the database, other solutions such as using bfile,

The value TRUE indicates that the database automatically publishes all statistics after it collects them. This is the default behavior of the database. If the query had returned the value FALSE, it means that the database will keep new statistics pending until you decide to formally publish them. You can also execute the GET_PREFS function to find out the publishing mode for a single table: SQL> SELECT dbms_stats.get_prefs('PUBLISH','stats','test_table') FROM dual; You can change the publishing settings for objects at the database or at the object (table) level by executing the SET_TABLE_PREFS function. For example, to keep the database from automatically publishing the statistics it collects for the table EMPLOYEES, execute this function: SQL> exec dbms_stats.set_table_prefs ('HR','EMPLOYEES', 'PUBLISH','FALSE'); The database stores pending statistics in the DBA_TAB_PENDING_STATS view and it stores the published statistics in the DBA_TAB_STATS view.

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