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If you decide to create a Fire method for each type of event, the obvious consequence is that there are going to be a number of Fire methods in the code. To simplify keeping track of which Fire method handles which events, you should use a naming convention, relating Fire methods to events and other data structures. Let s start with the naming of event properties. These properties are exposed by event sources that support subscriptions by type. Subscribers access these properties to subscribe or unsubscribe to a given event. One convention, first introduced with Visual Basic in the early 1990s, is to prefix

You ll see a high number of waits under the log file sync category if the server processes are frequently waiting for the log writer process to finish writing committed transactions (redo) to the redo log files from the log buffer. This is usually the result of too-frequent commits, and you can reduce it by adopting batch commits instead of a commit after every single transaction. This wait event may also be the result of an I/O bottleneck.

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other technology and the statement will remain true This is a fact: it is easier to write applications that perform poorly than it is to write applications that perform well If you don t know what you re doing, you may find that you ve managed to build a single-user system in the world s most scalable database! The database is a tool, and the improper use of any tool can lead to disaster Would you use a nutcracker as if it were a hammer to smash walnuts You could, but it would not be a proper use of that tool, and the result would be messy (and probably involve some seriously damaged fingers) Similar effects can be achieved by remaining ignorant of your database For example, I was called into a project recently The developers were experiencing massive performance issues it seemed that their system was serializing many transactions.

You can group some wait events under the category idle events. Some of these may be harmless in the sense that they simply indicate that an Oracle process was waiting for something to do. These events don t indicate database bottlenecks or contention for Oracle s resources. For example, the system may be waiting for a client process to provide SQL statements for execution. The following list presents some common idle events: Rdbms ipc message: Used by the background process, such as the log writer process and PMON, to indicate they are idle. SMON timer: The SMON process waits on this event. PMON timer: The PMON process idle event. SQL*Net message from client: The user process idle event. You should ignore many idle events during your instance performance tuning. However, some events, such as the SQL*Net message from client event, may indicate that your application isn t using an efficient database connection strategy. In this case, you need to see how you can reduce these waits, maybe by avoiding frequent logging on and off by applications.

You can use the various operating system tools, such as vmstat, to examine system performance. You can also use the new V$OSSTAT dynamic view to figure out the performance characteristics of your system. The V$OSSTAT view provides operating system statistics in the form of busy ticks. Here are some of the key system usage statistics: NUM_CPUS: Number of processors. IDLE_TICKS: Number of hundredths of a second that all processors have been idle. BUSY_TICKS: Number of hundredths of a second that all processors have been busy executing code. USER_TICKS: Number of hundredths of a second that all processors have been busy executing user code. SYS_TICKS: Number of hundredths of a second that all processors have been busy executing kernel code. IOWAIT_TICKS: Number of hundredths of a second that all processors have been waiting for I/O to complete. The AVG_IDLE_WAITS, AVG_BUSY_TICKS, AVG_USER_TICKS, AVG_SYS_TICKS, and AVG_IOWAIT_TICKS columns provide the corresponding information average over all the processors. Here's a simple example that shows how to view the system usage statistics captured in the V$OSSTAT view: SQL> SELECT * FROM V$OSSTAT; STAT_NAME VALUE OSSTAT_ID -------------------------------------------------------NUM_CPUS 16 0 IDLE_TICKS 17812 1 BUSY_TICKS 2686882247 2 USER_TICKS 1936724603 3 SYS_TICKS 750157644 4 IOWAIT_TICKS 1933617293 5 AVG_IDLE_TICKS 545952047 7 AVG_BUSY_TICKS 167700614 8 AVG_USER_TICKS 120815895 9 AVG_SYS_TICKS 46655696 10 AVG_IOWAIT_TICKS 120621649 11 OS_CPU_WAIT_TIME 5.3432E+13 13 RSRC_MGR_CPU_WAIT_TIME 0 14 IN_BYTES 6.2794E+10 1000 OUT_BYTES 0 1001 AVG_IN_BYTES 1.7294E+19 1004 AVG_OUT_BYTES 0 1005 17 rows selected. SQL>

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