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Oracle wait interface analysis has garnered quite a bit of attention in the last few years. There are entire books dedicated to Oracle waits. I discuss the important performance topic of Oracle wait analysis later in this chapter, in the section Analyzing Instance Performance. Ideally, all sessions should be on the CPU, with zero time spent waiting for resources such as I/O. However, remember that every working instance will have some kind of wait. It s unrealistic to expect to work toward a zero wait system. The key question should not be whether you have any Oracle wait events occurring, but rather if there are excessive waits.

The definition of the first function, _demoQueryWithPreparedStmt(), is as follows: private static void _demoQueryWithPreparedStmt( Connection conn, String stmtStr ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; try { pstmt = conn.prepareStatement( stmtStr ); rset = pstmt.executeQuery(); // print the result while (rset.next()) { Inside the while loop, for each object column of a row, we first retrieve the object using the getObject() method of ResultSet interface and cast it to the Struct object: Struct itemStruct = (Struct) rset.getObject ( 1 ); The next step retrieves all attributes from the Struct object into an object array. Notice how all attributes of the object type person materialize as a collection of attributes in an Object array: Object[] attributes = itemStruct.getAttributes(); Finally, we print out the number of attributes and loop through them, printing their class names and their values when converted to a String object: System.out.println ( "num of attributes: " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { System.out.println ( "class of attribute " + i + " = " + (attributes[i]).getClass().getName() + ", value = " + attributes[i] ); } } } finally { // release resources in the finally clause. JDBCUtil.close( rset, pstmt); } } In the next section, we define and explain the methods that use Struct objects in conjunction with CallableStatement.

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Any time a server process waits for an event to complete, it s classified as a wait event. There are more than 950 Oracle wait events in Oracle Database 11g. The most common wait events are those caused by resource contention such as latch contention, buffer contention, and I/O contention. A wait class is a grouping of related wait events, and every wait event belongs to a wait class. Important wait classes include Administrative, Application, Concurrency, Configuration, Idle, Network, System I/O, and User I/O. For example, the Administrative wait class includes lock waits caused by row-level locking. The User I/O class of waits refers to waits for blocks to be read off a disk. Using wait classes helps you move quickly to the root cause of a problem in your database by limiting the focus of further analysis. Here s a summary of the main wait classes in Oracle Database 11g: Administrative: Waits caused by administrative commands, such as rebuilding an index, for example. Application: Waits due to the application code. Cluster: Waits related to Real Application Cluster management. Commit: The single wait event log file sync, which is a wait caused by commits in the database. Concurrency: Waits for database resources that are used for locking, for example, latches. Idle: Waits that occur when a session isn t active, for example, the 'SQL*Net message from client' wait event. Network: Waits incurred during network messaging. Other: Miscellaneous waits. Scheduler: Resource Manager related waits.

System I/O: Waits for background-process I/O, including the database writer background process s wait for the db file parallel write event. Also included are archive-log related waits and redo log read-and-write waits. User I/O: Waits for user I/O. Includes the db file sequential read and db file scattered read events.

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