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Note The 8,168 default value is actually a function of your default block size. In a database with a 4k block size,

It should be possible to achieve clean separation between the business logic code and the data access code It should be relatively easy to create code generators, or templates for existing code generation tools, to assist in the creation of business classes An n-layer logical architecture that can be easily reconfigured to run on one to four physical tiers should be provided Complex features in NET should be used, but they should be largely hidden and automated (WCF, serialization, security, deployment, and so on) The concepts present in the framework from its inception should carry forward, including validation, authorization, n-level undo, and object-state tracking (IsNew, IsDirty, IsDeleted) In this chapter, I focus on the design of a framework that allows business developers to use object-oriented design and programming with these guidelines in mind.

CHAPTER 2 NETWORK ADMINISTRATION AND IT TRENDS THROUGHOUT HISTORY!

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Using dynamic sampling, the estimated cardinality will be much closer to reality (which leads to better query plans overall). Using the level 2 setting, the optimizer quickly scans the table to come up with more-realistic estimates of the true size of this table. In Oracle 10g, we should find this to be less of a problem, because the defaults will cause dynamic sampling to take place: ops$tkyte@ORA11GR2> create global temporary table gtt 2 as 3 select * from scott.emp where 1=0; Table created. ops$tkyte@ORA11GR2> insert into gtt select * from scott.emp; 14 rows created. ops$tkyte@ORA11GR2> set autotrace traceonly explain ops$tkyte@ORA11GR2> select * from gtt; Execution Plan ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=2 Card=14 Bytes=1218) 1 0 TABLE ACCESS (FULL) OF 'GTT' (TABLE (TEMP)) (Cost=2 Card=14 Bytes=1218) ops$tkyte@ORA11GR2> set autotrace off We get the right cardinality without having to ask for it. Dynamic sampling does not come free, however there is a cost associated with having to perform it at query parse time. If we gathered appropriate representative statistics ahead of time, we could avoid this at hard parse time. That leads us into DBMS_STATS. There are three methods to use DBMS_STATS to gather representative statistics. The first way is to use DBMS_STATS with the GATHER_SCHEMA_STATS, or GATHER_DATABASE_STATS call. These procedures allow you to

pass in a parameter, GATHER_TEMP, which is a Boolean and defaults to FALSE. When set to TRUE, any ON COMMIT PRESERVE ROWS global temporary table will have statistics gathered and stored (this technique will not work on ON COMMIT DELETE ROWS tables). Consider the following (note that this was done in an empty schema; the only objects are those you see created): ops$tkyte@ORA11GR2> create table emp as select * from scott.emp; Table created. ops$tkyte@ORA11GR2> create global temporary table gtt1 ( x number ) 2 on commit preserve rows; Table created. ops$tkyte@ORA11GR2> create global temporary table gtt2 ( x number ) 2 on commit delete rows; Table created. ops$tkyte@ORA11GR2> insert into gtt1 select user_id from all_users; 38 rows created. ops$tkyte@ORA11GR2> insert into gtt2 select user_id from all_users; 38 rows created. ops$tkyte@ORA11GR2> exec dbms_stats.gather_schema_stats( user ); PL/SQL procedure successfully completed. ops$tkyte@ORA11GR2> select table_name, last_analyzed, num_rows from user_tables; TABLE_NAME LAST_ANAL NUM_ROWS ------------------------------ --------- ---------EMP 01-MAY-10 14 GTT1 GTT2 As you can see, only the EMP table was analyzed in this case; the two global temporary tables were ignored. We can change that behavior by calling GATHER_SCHEMA_STATS with GATHER_TEMP => TRUE: ops$tkyte@ORA11GR2> insert into gtt2 select user_id from all_users; 38 rows created. ops$tkyte@ORA11GR2> exec dbms_stats.gather_schema_stats( user, gather_temp=>TRUE ); PL/SQL procedure successfully completed. ops$tkyte@ORA11GR2> select table_name, last_analyzed, num_rows from user_tables; TABLE_NAME -----------------------------EMP GTT1 GTT2 LAST_ANAL NUM_ROWS --------- ---------01-MAY-10 14 01-MAY-10 38 01-MAY-10 0

After walking through the design of the framework, s 6 through 16 dive in and implement the framework itself, focusing first on the parts that support UI development and then on providing scalable data access and object-relational mapping for the objects Before I get into the design of the framework, however, let s discuss some of the specific goals I am attempting to achieve..

Notice that the ON COMMIT PRESERVE rows table has accurate statistics, but the ON COMMIT DELETE ROWS does not. DBMS_STATS commits and that wipes out any information in that table. Do note, however, that GTT2 does now have statistics, which in itself is a bad thing, because the statistics are very much

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