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The EXPLAIN PLAN output reveals the use of the result cache by the query in our example. Since I used the RESULT_CACHE hint to use the result cache, the RESULT_CACHE_MODE parameter is set to MANUAL. If it is set to FORCE, I don t have to set the RESULT_CACHE hint inside the queries. The database will simply cache results for all repeatable SQL statements, unless I specify the NO_RESULT_CACHE hint in a query.

You now know three approaches of storing parent/child type of data: good old relational tables, nested tables, and object views on top of relational tables. Which ones should you use Since this book is focused on performance, we will compare these three methods to see which ones fare better as far as performance goes. Intuitively, an approach based on relational tables should outperform the other two approaches. However, we still need to ascertain by approximately how much. Also, it would be interesting to know the difference in performance between the nested table based approach and the object view based approach, as they are more or less equivalent in functionality and expressiveness (once all the instead of triggers on the object view are in place). So without further ado, let s look at the package that compares insert, delete, and update on the three approaches based on the schema that we created earlier. The package will perform various DML operations on the relational schema, the schema that used nested tables to store data, and the object view based schema that we examined earlier. I explain the code in comments interspersed within the package code. benchmark@ORA10G> create or replace package or_nt_rel_pkg 2 as 3 g_num_of_select_runs constant number := 10000; 4 g_num_of_child_updates constant number := 10000; 5 part_rel_id number := 1; 6 part_or_id number := 1; 7 part_nt_id number := 1; 8 9 procedure do_or_select; 10 procedure do_nt_select; 11 procedure do_rel_select; 12 procedure do_or_insert( p_num_of_parents in int := 50, 13 p_num_of_children in int := 500 ); 14 procedure do_nt_insert( p_num_of_parents in int := 50, 15 p_num_of_children in int := 500 );

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Use the DBMS_RESULT_CACHE package to manage the result cache, such as checking the status of the cache and flushing the cache The following example shows how to check the memory allocation to the cache by executing the MEMORY_REPORT function: SQL> set serveroutput on SQL> exec dbms_result_cachememory_report R e s u l t C a c h e M e m o r y R e p o r t [Parameters] Block Size = 1K bytes Maximum Cache Size = 672K bytes (672 blocks) Maximum Result Size = 33K bytes (33 blocks) [Memory] Total Memory = 5132 bytes [0005% of the Shared Pool] .. Fixed Memory = 5132 bytes [0005% of the Shared Pool] .. Dynamic Memory = 0 bytes [0000% of the Shared Pool] PL/SQL procedure successfully completed SQL> Execute the STATUS function to check the current status of the result cache, which could be ENABLED or DISABLED.

You can purge the contents of the result cache by executing the FLUSH procedure or the FLUSH function You may have to purge the result cache if the database ends up filling up the result cache, as the result cache doesn t automatically flush its contents If you load a new version of a function, for example, you can get rid of the older function s results from the result cache by purging the results with the FLUSH procedure or function Before you execute the FLUSH procedure or FLUSH function, you must first put the result cache in bypass mode by executing the BYPASS procedure with the TRUE value Once you purge the result cache, execute the BYPASS procedure again, now with the FALSE value, as shown here: BEGIN EXEC dbms_result_cachebypass (FALSE); END; / PL/SQL procedure successfully completed.

SQL> You can use the following views to manage the result cache: V$RESULT_CACHE_STATISTICS: Lists cache settings and memory usage statistics V$RESULT_CACHE_OBJECTS: Lists all cached objects and their attributes V$RESULT_CACHE_DEPENDENCY: Lists the dependency information between the cached results and dependencies V$RESULT_CACHE_MEMORY: Lists all memory blocks and their statistics V$RESULT_CACHE_OBJECTS: Lists both cached results and all dependencies For example, you can use the following query on the V$RESULT_CACHE_OBJECTS view to find out which results are part of the result cache:.

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SQL> select type,status,name from v$result_cache_objects; TYPE -----------Dependency Result STATUS ----------Published Published NAME -----------------------------------HR.COUNT_EMP select /* + result_cache query name(q1) */ last_name, salary from hr.employees order by salary

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