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The preceding query shows that waits due to the db file scattered read wait event account for most of the waits in this instance. The db file sequential read wait event, as you ll learn shortly, is caused by full table scans. It s somewhat confusing in the beginning when you re trying to use all the wait-related V$ views, which all look similar. Here s a quick summary of how you go about using the key wait-related Oracle Database 11g dynamic performance views. First, look at the V$SYSTEM_EVENT view and rank the top wait events by the total amount of time waited, as well as the average wait time for that event. Start investigating the top waits in terms of the percentage of total wait time. You can also look at any AWR reports you may have, because the AWR also lists the top five wait events in the instance. Next, find out more details about the specific wait event that s at the top of the list. For example, if the top event is buffer busy waits, look in the V$WAITSTAT view to see which type of buffer block (data block, undo block, and so on) is causing the buffer busy waits (a simple SELECT * from V$WAITSTAT

The INSERT statement inserts new rows into existing tables, and the DELETE statement removes entire rows from tables. The UPDATE command modifies one or more columns of a single row, or multiple rows within a table. Although optimizing the writing of SELECT statements that address large tables is an important part of performance tuning, it s the SQL statements that modify, delete, or add data that cause more frustration for the DBA when dealing with an OLTP database. Designing proper tables and indexes is important if the database is to efficiently process a large number of concurrent inserts, deletes, and updates to tables. In addition, the DBA needs to properly size the undo tablespace and the online redo logs to efficiently process these types of statements.

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private static void _demoInsertUsingPreparedStmt( Connection conn ) throws SQLException { PreparedStatement pstmt = null; try { The first step is to create a StructDescriptor for the object type item. Note that for a given object type, we need to create the StructDescriptor only once. Also note that we should always qualify the object type with the user that owns it (e.g., benchmark in the following example). StructDescriptor itemDescriptor = StructDescriptor.createDescriptor( "BENCHMARK.ITEM", conn ); The next step is to create and initialize the object array that contains values of attributes of the item object that we want to insert. Note how we create the attributes in the order in which we specified them during the object type creation (in this example, the first attribute is id, the second attribute is name, and the third attribute is description). We also use the appropriate class to create an attribute (java.math.BigDecimal for number and String for varchar2): Object[] itemAttributes = new Object[ itemDescriptor.getLength()]; itemAttributes[0] = new BigDecimal(2); itemAttributes[1] = "item2"; itemAttributes[2] = "item2 desc using prepared statement"; Next, we create an oracle.sql.STRUCT object using the descriptor and the object array containing the attribute values: // Next we create the STRUCT object Struct itemObject = new STRUCT ( itemDescriptor, conn, itemAttributes ); The remaining steps are the usual ones required to insert a record using the PreparedStatement interface: pstmt = conn.prepareStatement( "insert into item_table values( )"); pstmt.setObject(1, itemObject, Types.STRUCT ); int numOfRowsInserted = pstmt.executeUpdate(); System.out.println( "Inserted " + numOfRowsInserted + " rows"); conn.commit(); } finally { // release resources in the finally clause. JDBCUtil.close( pstmt); } }

Transaction-control statements are used to control the changes made by data-manipulation SQL statements, such as INSERT, UPDATE, and DELETE. These are the four transaction-control statements: COMMIT: When this statement follows a set of DML statements, the changes will be made permanent. ROLLBACK: When this statement follows one or more DML statements, the changes made by the preceding statement or statements will be undone. If there are no save points, all statements from the beginning of the transaction will be rolled back. SAVEPOINT: This statement allows flexibility in your transactions, helping you set intermediate points in the transaction to which you can roll back (undo) your transactions. SET TRANSACTION: This rarely used statement denotes the start of a transaction and is used in statements like SET TRANSACTION READ ONLY.

Data definition language statements enable you to define the structure of the various schema objects in the Oracle database. DDL statements enable you to create, alter, and remove database objects, such as tables and indexes. These are some of the main uses of DDL statements: Creating tables, indexes, and other schema objects Creating and modifying procedures, functions, and packages Dropping and modifying database objects Creating and managing users of the database Granting and revoking privileges on objects Creating and altering tablespaces Creating and modifying database links

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