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Since the OEM Database Control offers such an intuitive interface for using the SQL Access Advisor to generate recommendations regarding indexes and materialized views, I won t discuss the laborious steps you need to use when invoking the Advisor through the DBMS_ADVISOR package. I ll merely summarize the approach here: 1. Run some SQL statements so you can use them for your task later on. 2. Create a task using the CREATE_TASK procedure. 3. Create a workload using the CREATE_SQLWKLD procedure. 4. Link your task to the workload by using the ADD_SQLWKLD_REF procedure. 5. Use the appropriate procedure for loading either a hypothetical workload, a SQL cache workload, or a SQL tuning set. 6. Set the task parameters by using the SET_TASK_PARAMETER procedure. 7. Generate recommendations by using the EXECUTE_TASK procedure, using your task name. 8. View the recommendations using the USER_ADVISOR_RECOMMENDATIONS view. Here s a query using the USER_ADVISOR_ACTIONS view that shows the SQL Access Advisor s recommendations: SQL> SELECT rec_id, action_id, SUBSTR(command,1,30) AS command FROM user_advisor_actions WHERE task_name = :task_name ORDER BY rec_id, action_id; REC_ID ACTION_ID COMMAND ---------- ---------- ----------------------------1 5 CREATE MATERIALIZED VIEW LOG 1 8 ALTER MATERIALIZED VIEW LOG 1 9 CREATE MATERIALIZED VIEW LOG 1 19 CREATE INDEX SQL>

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During the evolution of this script the capability to automatically switch to an alternate connection type if the initial attempt is unsuccessful was added. This came about because some users wanted to connect with a specified default protocol instead of the original default of rlogin. For instance, some devices have only a telnet daemon to which remote machines are able to attach; the users of those machines would want telnet as their default connection method. When nmap became available, it was then possible to determine what ports were available on the remote machine. nmap is an open source utility for network exploration and auditing. In our script, nmap is used to determine if a specified port on a remote machine is open; the code will then choose the appropriate connection method. If the value of the CONNECTION_TYPE variable is set to any, the code will try ssh first, then rlogin, and then telnet instead of simply using a single specified connection method. The script will then attach to the remote machine using the first available protocol. Note

You can use the QUICK_TUNE procedure of the DBMS_ADVISOR package when you have a single SQL statement to tune. You need to supply a task name and a SQL statement as inputs to the procedure. Here s an example: VARIABLE task_name VARCHAR2(255); VARIABLE sql_stmt VARCHAR2(4000); EXECUTE :sql_stmt := 'SELECT COUNT(*) FROM customers WHERE cust_state_province=''TX'''; EXECUTE :task_name := 'MY_QUICKTUNE_TASK'; EXECUTE DBMS_ADVISOR.QUICK_TUNE(DBMS_ADVISOR.SQLACCESS_ADVISOR, :task_name, :sql_stmt); This will produce identical results as when you use all the steps shown in the Using the DBMS_ADVISOR Package section.

Synonyms are aliases for objects in the database, and they are used mainly to make it easy for users to access database objects owned by other users, and for security purposes. Synonyms hide the underlying object s identity and can be either private or public. Public synonyms are accessible by all the users in the database, and private synonyms are part of the individual user s schema access rights have to be individually granted to specific users before they can use the private synonyms. Oracle synonyms can be created for tables, views, materialized views, and stored code, such as packages and procedures. Synonyms are very powerful from the point of view of allowing users access to objects that do not lie within their schemas. All synonyms have to be created explicitly with the CREATE SYNONYM command, and the underlying objects can be located in the same database or in other databases that are connected by database links. There are two major uses of synonyms: Object transparency: Synonyms can be created to keep the original object transparent to the user. Location transparency: Synonyms can be created as aliases for tables and other objects that belong to a database other than the local database.

You can group the automatic advisors into the following groups: memory-related, tuning-related, and space-related. Let s briefly look at the advisors that fall into these three groups.

There are two memory- and instance-related management advisors: Memory Advisor: The Memory Advisor provides recommendations regarding the optimal sizing of the SGA and the PGA memory. The Allocation History chart shows the history of the memory allocation for the various SGA components over time. MTTR Advisor: This advisor lets you configure instance recovery by enabling you to adjust the mean time to recover (MTTR) setting for an instance.