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You can execute Java stored procedures just as you would PL/SQL stored procedures. Here s a summary of the steps involved in creating a Java stored procedure: 1. Define the Java class. 2. Using the Java compiler, compile the new class. 3. Load the class into the Oracle database. You can do this by using the loadjava command-line utility. 4. Publish the Java stored procedure. Once you ve completed these steps, you can invoke the Java stored procedure.

A buffer pool in this context is simply a part of the total buffer cache that is subject to different retention criteria for database objects like tables For example, you can take a total buffer cache of 500MB and divide it into three pools, with 200MB in the first two pools and 100MB in the third Once you have created separate buffer pools, you can assign a table exclusively to that buffer pool when you create that table You can also use the ALTER TABLE or ALTER INDEX command to modify the type of buffer pool that a table or index should use Table 4-2 lists the main types of buffer pools that you can configure.

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JDBC is a popular method used to connect to an Oracle database from Java. 10 contains a complete example of a Java program. JDBC provides a set of interfaces for querying databases and processing SQL data in the Java programming language. Listing A-9 shows a simple JDBC program that connects to an Oracle database and executes a simple SQL query. Listing A-9. A Simple JDBC Program import java.sql.*; public class JDBCExample { public static void main(String args[]) throws SQLException /* Declare the type of Oracle Driver you are using */ {DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver()); /* Create a database connection for the JDBC program */ Connection conn= DriverManager.getConnection( "jdbc:oracle:thin:@nicholas:1521:aparna","hr","hr"); Statement stmt = conn.createStatement(); /* Pass a query to SQL and store the results in the result set rs */ ResultSet rs = stmt.executeQuery("select emp_id, emp_name,salary from employees"); /* Using the while loop, result set rs is accessed row by row */ while(rs.next()){ int number = rs.getInt(1); String name= rs.getString(2); System.out.println(number+" "+name+" "+salary); } /* Close the JDBC result set and close the database connection */ rs.close(); conn.close(); } } JDBC is ideal for dynamic SQL, where the SQL statements aren t known until run time.

Note that any database objects that you haven t assigned to the keep or the recycle buffer pool will be assigned to the default buffer pool, which is sized according to the value you provide for the DB_CACHE_SIZE initialization parameter The keep and the recycle buffer pools are purely optional, while the default buffer pool is mandatory Remember that the main goal in assigning objects to multiple buffer pools is to minimize the misses in the data cache and thus minimize your disk I/O In fact, all buffer caching strategies have this as their main goal If you aren t sure which objects in your database belong to the different types of buffer caches, just let the database run for a while with some best-guess multiple cache sizes and query the data dictionary view V$DB_CACHE_ADVICE to get some advice from Oracle itself..

The NTP daemon This program relies on the configuration statements within the ntpconf, ntpdrift, and ntpkeys files to keep the server on which it is installed synchronized and its communications secure with the configured time source(s) The daemon operates on a server that s configured as a primary timeserver with a reference clock, or the daemon operates on an NTP client with the time source being a primary timeserver or even a high-level stratum server The NTP query program The use of the restrict command with the noquery flag within the ntpconf file can prevent the local host from answering queries from another device that identifies the local host as a parameter (IP address or hostname) in this command However, this utility is useful when it comes to NTP troubleshooting if the target host permits it.

SQLJ is a complementary API to JDBC, and it s ideal for applications in which you re using static SQL (SQL that s known before the execution). Being static, SQLJ enables you to trap errors before they

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