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undo tablespace size might be for your database. Each of these advisors bases its actions on a specific Oracle PL/SQL package like the DBMS_ADVISOR package. Each time an advisor runs a task, it performs an analysis and provides you with recommendations. Note that the ADDM and the Automatic Segment Advisor are the only advisors that are scheduled to run automatically. To get recommendations from any of the other advisors, you must manually schedule or perform an advisor task. The management advisory framework offers you a uniform interface for all Oracle advisors. Some of these advisors have been around since Oracle9i. What is new is that Oracle has built a common management advisory framework to make it easy to manage the advisors. The new framework allows you to use a similar method to invoke all the advisors, and the advisors provide their reports in a consistent format as well. All the advisors get their raw data from the AWR and store their analysis results in the AWR. The advisory framework s primary function is to help the database improve its performance. The ADDM recommends using the management advisors on an ad hoc basis, whenever a performance problem needs a deeper analysis. DBAs can also use the advisors for performing what-if analyses.

Notice how the select statement has for input parameters. The query will get us all employees of a given job title and hire date earlier than a given date. Next, we prepare the statement pstmt = conn.prepareStatement( stmtString ); We then bind the parameters. The first parameter is a string for the job column of the emp table; hence we use the setString() method, passing the constant that defines the job column index value of 1 and the parameter value of CLERK. pstmt.setString(JOB_COLUMN_INDEX, "CLERK" ); For the hiredate column, we pass the current date. The parameter index is the constant HIREDATE_COLUMN_INDEX with the value 2 in this case: pstmt.setDate(HIREDATE_COLUMN_INDEX, new java.sql.Date( new java.util.Date().getTime())); Notice that the date value is of type java.sql.Date, not java.util.Date. We execute the statement next. Since it is a query, we use the executeQuery() method: rset = pstmt.executeQuery(); Finally, we end the method after printing the results of the query and closing the result set and statement: // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( 1 ); String empName = rset.getString ( 2 ); String empJob = rset.getString ( 3 ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } Let s look at how we can execute the same query, but this time binding parameters by name. The method _demoBindingByParameterName() begins by declaring variables and starting a try catch block: private static void _demoBindingByParameterName( Connection conn ) throws SQLException { String stmtString = "select empno, ename, job " +

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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: This advisor provides recommendations regarding the optimal sizing of total memory allocation as well as 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.

Obviously, if you are using automatic shared memory and program global area management, you don t need the Memory Advisor to tell you how to size these memory components, since the database will manage these by itself.

"from emp where job = :job and hiredate < :hiredate"; System.out.println( "\nCase 2: bind parameter by name\n"); System.out.println( "Statement: " + stmtString ); OraclePreparedStatement opstmt = null; ResultSet rset = null; final int SELECT_CLAUSE_EMPNO_COLUMN_INDEX = 1; final int SELECT_CLAUSE_ENAME_COLUMN_INDEX = 2; final int SELECT_CLAUSE_JOB_COLUMN_INDEX = 3; try { Note that this time we use the parameter names :job and :hiredate for our input parameters. Notice also that we have to use the OraclePreparedStatement interface. The first step involves preparing the statement with the query: opstmt = (OraclePreparedStatement) conn.prepareStatement( stmtString ); Next, we bind the job parameter with the value CLERK using the setStringAtName() method of the OraclePreparedStatement interface (note that there is no : in the string we pass as the parameter name): opstmt.setStringAtName("job", "CLERK" ); We bind the hiredate parameter with the current date value: opstmt.setDateAtName("hiredate", new java.sql.Date( new java.util.Date().getTime())); The next steps of executing the query, printing the results, and releasing the resources are the same as in the previous example. This also ends our class listing. // execute the query rset = opstmt.executeQuery(); // print the result System.out.println( "printing query results ...\n"); while (rset.next()) { int empNo = rset.getInt ( SELECT_CLAUSE_EMPNO_COLUMN_INDEX ); String empName = rset.getString ( SELECT_CLAUSE_ENAME_COLUMN_INDEX ); String empJob = rset.getString ( SELECT_CLAUSE_JOB_COLUMN_INDEX ); System.out.println( empNo + " " + empName + " " + empJob ); } } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( opstmt ); } } } // end of program

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