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Instead of giving select, insert, and other such privileges to the database user directly on tables, you can grant an execute privilege to the packages and procedures This is a significant improvement in terms of security 16 examines this further If you want to extend your logic, add some additional validation, enable auditing, and so on, it is much easier to do so if your code resides in PL/SQL packages It is much easier to tune, change, test, and deploy procedure queries (and inserts, etc) in PL/SQL than in Java You just need to update the database, and everyone sees the changes instantly You don t need to update Java classes at multiple places where your middle-tier code is deployed Also, the tuning process becomes infinitely easier.

Although letting the database automatically collect optimizer statistics is the recommended approach, you can still manually collect optimizer statistics using the DBMS_STATS package.

Tip For large tables, Oracle recommends just sampling the data, rather than looking at all of it. Oracle lets you specify row or block sampling, and it sometimes seems to recommend sampling sizes as low as 5 percent. The default sampling size for an estimate is low too. Oracle also recommends using the DBMS_STATS automatic sampling procedure. However, statistics gathered with sampled data aren t reliable. The difference between collecting optimizer statistics with the estimate at 30 percent and 50 percent is startling at times in terms of performance. Always choose the option of collecting full statistics for all your objects, even if the frequency is not as high as it could be if you just sampled the data.

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As I explained in 17, you must manually collect optimizer statistics under the following conditions: When you use external tables When you need to collect system statistics To collect statistics on fixed objects, such as the dynamic performance tables (For dynamic tables, you should use the GATHER_FIXED_OBJECTS_STATS procedure to collect optimizer statistics.) Immediately after you run a bulk load job, because this makes your automatically collected statistics unrepresentative The following sections show you how to make use of the DBMS_STATS package to gather statistics.

In most cases, you can just run the procedure (or the SQL statement) independent of the application, and use tkprof to tune it You don t need to go through the compile/tune cycle on the middle-tier code in Java I personally find this very convenient during development..

Note Oracle recommends that you not use the older ANALYZE statement to collect statistics for the optimizer, but rather use the DBMS_STATS package. The ANALYZE command is retained for backward compatibility, and you must use it for non-optimizer statistics collection tasks, such as verifying the validity of an object (using the VALIDATE clause), or identifying migrated and chained rows in a table (using the LIST CHAINED ROWS clause).

You use various DBMS_STATS package procedures to collect optimizer statistics. Most of these procedures have three common attributes STATOWN, STATTAB, and STATID which enable you to save the collected statistics in a database table owned by a user. By default, these attributes are null, and you shouldn t provide a value for any of these attributes if your goal is to collect statistics for the optimizer. When you ignore these attributes, optimizer statistics you collect are stored in the data dictionary tables by default, where they re accessible to the Oracle optimizer.

The DBMS_STATS package has several procedures that let you collect data at different levels. The main data collection procedures for database table and index data are as follows: GATHER_DATABASE_STATISTICS gathers statistics for all objects in the database. GATHER_SCHEMA_STATISTICS gathers statistics for an entire schema. GATHER_TABLE_STATISTICS gathers statistics for a table and its indexes. GATHER_INDEX_STATISTICS gathers statistics for an index. Let s use the DBMS_STATS package to collect statistics first for a schema, and then for an individual table. Collecting statistics at the schema level: SQL> EXECUTE DBMS_STATS.GATHER_SCHEMA_STATS (ownname => 'hr'); PL/SQL procedure successfully completed. SQL> Collecting statistics at the table level: SQL> EXECUTE DBMS_STATS.GATHER_TABLE_STATS ('hr','employees'); PL/SQL procedure successfully completed. SQL>

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