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Creating a Cacheable Function
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Include the RESULT_CACHE clause in a PL/SQL function definition to make the database cache the function results in the PL/SQL Function Result Cache. Here s an example: SQL> CREATE OR REPLACE function get_dept_info (dept_id number) RETURN dept_info_record result_cache relies_on (employees) IS rec dept_info_record; BEGIN SELECT AVG(salary), COUNT(*) INTO rec FROM employees WHERE department_id = dept_id; RETURN rec; END get_dept_info; / The RELIES ON clause is optional. The clause specifies that the database must invalidate the function results if any of the tables or other objects that the function depends on undergoes a modification.
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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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The first time the database executes the GET_DEPT_INFO function, the function will execute as usual. On subsequent executions of the function, the database fetches the function values directly from the PL/SQL Function Result Cache instead of reexecuting the function. The database reexecutes the function only when You bypass the result cache by not specifying the RESULT_CACHE hint. You execute the DBMS_RESULT_CACHE_BYPASS procedure to make functions and queries bypass the result cache, regardless of the setting of the RESULT_CACHE_MODE parameter or the specification or the RESULT_CACHE hint. Any of the objects underlying a function change and you ve specified the RELIES_ON clause in the function definition. The database ages out cached results because the system needs additional memory.
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A PL/SQL function must satisfy the following requirements in order for the database to cache its results. A function cannot Have any IN/OUT parameters Be an anonymous block Be defined in a module that has invoker s rights Have parameters that belong to the collection, object, ref cursor, or LOB types Be a pipelined table function Besides meeting these requirements, the function must not depend on session-specific settings or application contexts and must also not have any side effects.
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The Client Query Result Cache
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If you are using any OCI applications and drivers such as JDBC and ODP.NET, you can also use Oracle s client-side caching of SQL result sets in the Client Query Result Cache that s located on the server. The database keeps the result sets consistent with changes in session attributes. If you ve frequently repeated statements in your applications, client-side caching could offer tremendous improvement in query performance benefits. Since the database caches results on the clients, server round-trips are minimized and scalability improves as a result, with lower I/O and CPU load. Unlike server-side caching, client-side caching isn t enabled by default. If your applications produce small result sets that are static over a period of time, client-side caching may be a good thing to implement. Frequently executed queries and queries involving lookup tables are also good candidates for client-side caching.
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Enabling and Disabling the Client Query Result Cache
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As with server-side caching, you use the RESULT_CACHE_MODE initialization parameter to enable and disable client-side caching. The RESULT_CACHE and the NO_RESULT_CACHE hints work the same way as they do for server-side caching. If you choose to specify the MANUAL setting for the RESULT_CACHE_MODE parameter, you must use the RESULT_CACHE hint in a query for the query s results to be cached. Also, the two hints override the setting of the RESULT_CACHE_MODE parameter, as in the case of server-side caching. You pass the RESULT_CACHE and the NO_RESULT_CACHE hints to SQL statements by using the OCIStatementPrepare() and the OCIStatementPrepare2() calls.
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CHAPTER 19 IMPROV IN G DA TA BAS E PERFORMAN CE: SQL QUERY OPTIMIZA TION
Managing the Client Result Cache
There are two initialization parameters that control how the Client Query Result Cache works. Here s a brief description of these parameters: CLIENT_RESULT_CACHE_SIZE: Determines the maximum client per-process result set cache size (in bytes). If you set this parameter to zero, you disable the Client Query Result Cache. The database allocates the maximum-size memory to every OCI client process by default.
Tip
You can override the setting of the CLIENT_RESULT_CACHE_SIZE parameter with the server-side parameter OCI_RESULT_CACHE_MAX_SIZE. By setting the latter to zero, you can disable the Client Query Result Cache.
CLIENT_RESULT_CACHE_LAG: Determines the Client Query Result Cache lag time. A low value means more round-trips to the database from the OCI client library. Set this parameter to a low value if your application accesses the database infrequently. An optional client configuration file overrides any client caching configuration parameters you set. You can set the client-side configuration parameters in the sqlnet.ora file on the client. You can set the following client-side configuration parameters: OCI_RESULT_CACHE_MAX_SIZE: Specifies the maximum size of the query cache for a single process OCI_RESULT_CACHE_MAX_RSET_SIZE: Enables you to specify the maximum size of a single result in bytes for a process OCI_RESULT_CACHE_MAX_RST_ROWS: Sets the maximum size of a query result in rows for a single process You can also insert the RESULT_CACHE and NO_RESULT_CACHE hints in OCI applications. Use the CLIENT_RESULT_CACHE view to see the settings of the result cache and the usage statistics for the Client Query Result Cache.
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