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Managing the Result Cache
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The result cache is always enabled by default, and its size depends on the memory the database allocates to the shared pool. If you specify the MEMORY_TARGET parameter for allocating memory, Oracle allocates 0.25% of the MEMORY_TARGET parameter value to the result cache. If you specify the SGA_TARGET parameter instead, Oracle allocates 0.5% of the SGA_TARGET value to the result cache. You can change the memory allocated to the result cache by setting the RESULT_CACHE_MAX_SIZE initialization parameter. This parameter can range from a value of zero to a system-dependent maximum. You disable result caching by setting the parameter to zero, as shown here:
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CHAPTER 19 IM PR OVING DA TA BAS E PERFORM ANC E: S QL QUE RY OPTIMIZA TION
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SQL> ALTER SYSTEM SET result_cache_max_size=0; Since result caching is enabled by default, it means that the RESULT_CACHE_MAX_SIZE parameter has a positive default value as well, based on the size of the MEMORY_TARGET parameter (or the SGA_TARGET parameter if you have that parameter instead). In addition to the RESULT_CACHE_MAX_SIZE parameter, two other initialization parameters have a bearing on the functioning of the result cache: the RESULT_CACHE_MAX_RESULT parameter specifies the maximum amount of the result cache a single result can use. By default, a single cached result can occupy up to 5 percent of the result cache, and you can specify a percentage between 1 and 100. The RESULT_CACHE_REMOTE_EXPIRATION parameter determines the length of time for which a cached result that depends on remote objects is valid. By default, this parameter is set to zero, meaning you aren t supposed to use the result cache for queries involving remote objects. The reason for this is over time remote objects could be modified, leading to invalid results in the cache.
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Setting the RESULT_CACHE_MODE Parameter
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Whether the database caches a query result or not depends on the value of the RESULT_CACHE_MODE initialization parameter, which can take two values: MANUAL or FORCE. Here s how the two values affect result caching behavior in the database: If you set the parameter to FORCE, the database will try to use the cache for all results, wherever it s possible to do so. You can, however, skip the cache by specifying NO_RESULT_CACHE hint within a query. If you set the parameter to MANUAL, the database caches the results of a query only if you include the RESULT_CACHE hint in the query. By default, the RESULT_CACHE_MODE parameter is set to MANUAL and you can change the value dynamically as shown here: SQL> alter session set result_cache_mode=force scope=spfile;
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Using the RESULT_CACHE and NO_RESULT_CACHE Hints
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Using the RESULT_CACHE hint as a part of a query adds the ResultCache operator to a query s execution plan. The ResultCache operator will search the result cache to see whether there s a stored result in there for the query. It retrieves the result if it s already in the cache; otherwise, the ResultCache operator will execute the query and store its results in the result cache. The no_result_cache operator works the opposite way. If you add this hint to a query, it ll lead the ResultCache operator to bypass the result cache and reexecute the query to get the results. The following example shows how to incorporate the RESULT_CACHE hint in a SQL query: SQL> 2 3 4* SQL> The RESULT_CACHE hint in line 1 of the query adds the ResultCache operator, which looks in the result cache for the cached results and, if they aren t there already, executes the query and stores its results in the result cache. The EXPLAIN PLAN for the query shows that the query will utilize the result cache: select /*+ result_cache +*/ department_id, avg(salary) from hr.employees group by department_id;
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
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SQL> EXPLAIN PLAN FOR select /*+ result_cache +*/ 2 department_id,avg(salary) 3 from hr.employees 4* group by department_id SQL> / Explained. SQL> SQL> SELECT plan_table_output FROM table(DBMS_XPLAN.DISPLAY()); PLAN_TABLE_OUTPUT ---------------------------------------------------------------Plan hash value: 1192169904 ---------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------PLAN_TABLE_OUTPUT ---------------------------------------------------------------| 0 | SELECT STATEMENT || 11 | 77 | 4 (25)| 00:00:01 | | 1 | RESULT CACHE | 8nk7a7rfhymzy0s0b89ksn9bfz | || | 2 | HASH GROUP BY | | 11 | 77 | 4 (25)| 00:00:01 | | 3 | TABLE ACCESS FULL| EMPLOYEES | 107 | 749 | 3 (0)| 00:00:01 | PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------------Result Cache Information (identified by operation id): -----------------------------------------------------1 - column-count=2; dependencies=(HR.EMPLOYEES); name="select /*+ result_cache +*/ department_id,avg(salary) from hr.employees group by department_id" 15 rows selected. SQL>
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