rdlc data matrix

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Context A process P1 wishes to send a command to a process P2. P1 needs execution feedback at specific times, designated by P1. Feedback is not necessary except at those specific times. P2 is able to provide the feedback quickly and reliably. Forces When the caller doesn t care about or can t handle changes in status of the callee except at given moments, it is inefficient for the callee to issue unsolicited status-change notifications. By having the caller ask for status, it can control the frequency of status requests during the various intermediate steps taken by the callee.

The next query shows that the parse time CPU usage is 96431, which is an insignificant proportion of total CPU usage in your database: SQL> SELECT name, value FROM V$SYSSTAT 2 WHERE name LIKE '%parse%'; NAME -------------------parse time cpu parse time elapsed parse count (total) parse count (hard) 4 rows selected. SQL> VALUE -------96431 295451 3147900 29139

Listing 20-12 shows an example of a session whose CPU usage is predominantly due to high parse time. Listing 20-12. Determining Parse Time CPU Usage SQL> 2 3 4 5 6 7 8 SELECT a.value " Tot_CPU_Used_This_Session", b.value "Total_Parse_Count", c.value "Hard_Parse_Count", d.value "Parse_Time_CPU" FROM v$sysstat a, v$sysstat b, v$sysstat c, v$sysstat d

In a transparent interaction with polled feedback, the caller polls the callee for progress updates, while a previously issued asynchronous command is being executed. After sending the main command on a secondary thread, the caller enters a polling loop, as shown in Figure 9-13.

Relational database principles underlie SQL. You need only instruct the language what to do, not how to do it. In addition to working with traditional relational data, Oracle s new XML-centric extensions to its SQL language enable you to manage XML, full text, multimedia, and objects. Oracle Database 11g integrates XML query, storage, and update functionality in the database engine. No matter which tool you use to access the Oracle database, ultimately you ll be using Oracle SQL to perform your transactions. Your application program or the Oracle tool you use may allow you access to the database without your using SQL, but the tools and applications themselves have to use SQL to process your requests.

SQL includes commands for data modeling, data definition, data access, data security, and data administration. SQL statements used by Oracle can be broadly divided into several groups based on whether they change the table data, the table structures, or some other session or instance characteristic. The SQL statement types are as follows: System control Session control Embedded SQL Data manipulation Transaction control Data definition The following sections examine each of these broad types of SQL statements in detail.

You can use the system-control statement ALTER SYSTEM to alter the properties of a running database instance. For example, you can use ALTER SYSTEM to modify certain initialization parameters, such as the shared pool component of the system global area (SGA). At present, the ALTER SYSTEM command is the only system-control SQL statement in Oracle. Here s an example of the ALTER SYSTEM command: SQL> ALTER SYSTEM KILL SESSION '25,9192'; Session killed SQL>

Figure 9-13. A transparent interaction with polled feedback Because the callee must be able to support polling requests while it is executing a command on a different thread, the callee must use thread-safe operations to return the progress feedback.

Session-control statements dynamically alter the properties of an individual user s session. For example, if you intend to trace what your SQL session is doing in the database, you can use the ALTER SESSION SET SQL_TRACE=TRUE SQL statement to trace your session alone. The session-control statements also come in handy when you re changing several initialization parameters just for your session.

PL/SQL (Oracle s procedural extension of the SQL language) doesn t support session-control statements.

Common session-control statements include the ALTER SESSION and SET ROLE commands. Here s an example of the use of the ALTER SESSION statement, wherein the ALTER SESSION command is used to set the data format for the duration of the session: SQL> ALTER SESSION SET NLS_DATE_FORMAT = 'MM-DD-YYYY HH:MI:SS'; Session altered. SQL>