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WAIT_CLASS#: This is the number of the wait class. WAIT_CLASS: This is the name of the wait class. WAIT_TIME: This is the wait time in seconds if the state is waited known time. SECONDS_IN_WAIT: This is the wait time in seconds if the state is waiting. STATE: The state could be waited short time, waited known time, or waiting, if the session is waiting for an event. The fourth wait-related view is the V$SESSION view. Not only does this view provide many details about the session, it also provides significant wait information as well. The V$SESSION view contains all the columns of the V$SESSION_WAIT view, plus a number of other important session-related columns. Because of this overlap of wait information in the V$SESSION and the V$SESSION_WAIT views, you can use the V$SESSION view directly to look for most of the wait-related information, without recourse to the V$SESSION_WAIT view. You can start analyzing the wait events in your system by first querying the V$SYSTEM_EVENT view to see if any significant wait events are occurring in the database. You can do this by running the query shown in Listing 20-15. Listing 20-15. Using the V$SYSTEM_EVENT View to View Wait Events SQL> 2 3 4* SELECT event, time_waited, average_wait FROM V$SYSTEM_EVENT GROUP BY event, time_waited, average_wait ORDER BY time_waited DESC; TIME_WAITED -----------24483121 18622096 12485418 3120909 3093214 3024203 831831 107253 52955 19958 5884 AVERAGE_WAIT --------------216.71465 106.19049 205.01844 306.93440 29459.18100 1536.68852 .25480 .90554 43.08787 2.02639 1.47505

EVENT ---------------------------rdbms ipc message SQL*Net message from client PX Idle Wait pmon timer smon timer PL/SQL lock timer db file sequential read db file scattered read free buffer waits log file parallel write latch free . . . 58 rows selected. SQL>

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The Struct interface does not expose any methods to create Struct objects in your Java program so that you can insert or update objects in the database. Thus, for inserting and/or updating data, you have to use the extended Oracle functionality exposed by the class oracle.sql.STRUCT. Inserting an object using oracle.sql.STRUCT in conjunction with either the PreparedStatement interface or the CallableStatement interface involves the following steps: 1. Create an oracle.sql.StructDescriptor object for the database object type. The StructDescriptor object contains information about the object type required to manually construct a STRUCT object later. You need only one StructDescriptor object for any number of STRUCT objects that correspond to the same SQL type. For example, to create a new StructDescriptor object for the object type item, assuming that conn is an initialized Connection object, you can use the following code: StructDescriptor itemDescriptor = StructDescriptor.createDescriptor( "BENCHMARK.ITEM", conn );; 2. Create an array of objects with the same number of elements as the number of attributes of the object type. Each element must be of the appropriate data type representing the object attribute (as per Table A-1 in the Appendix). If the object type consists of nested objects, you need to create a corresponding oracle.sql.STRUCT object in its place. 3. Construct an oracle.sql.STRUCT object, passing in the StructDescriptor you created in step 1, a Connection object, and the array of objects you created in step 2 as the object attribute values. 4. Use the setObject() method in the PreparedStatement or CallableStatement interface to set the value of the object and then insert it into the table containing the object.

This example shows a simple system with hardly any waits other than the idle type of events and the SQL*Net wait events. There aren t any significant I/O-related or latch-contention related wait events in this database. The db file sequential read (caused by index reads) and the db file scattered read (caused by full table scans) wait events do seem somewhat substantial, but if you compare the total wait time contributed by these two events to the total wait time since the instance started, they don t stand out. Furthermore, the AVERAGE_WAIT column shows that both these waits have a low average wait time (caused by index reads). I discuss both these events, along with several other Oracle wait events, later in this chapter, in the section Important Oracle Wait Events. However, if your query on a real-life production system shows significant numbers for any nonidle wait event, it s probably a good idea to find out the SQL statements that are causing the waits. That s where you have to focus your efforts to reduce the waits. You have different ways to obtain the associated SQL for the waits, as explained in the following section.

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