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When your users complain that the database is crawling and they can t get their queries returned fast enough, there s no use in your protesting that your database is showing high hit ratios for the shared pool and the buffer cache (and the large pool and redo log buffer as well). If the users are waiting for long periods of time to complete their tasks, then the response time will be slow, and you can t say that the database is performing well, the high hit ratios notwithstanding.
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For an interesting review of the Oracle wait analysis (the wait interface), please read one of the early papers in this area, titled Yet Another Performance Profiling Method (or YAPP-Method), by Anjo Kolk, Shari Yamaguchi, and Jim Viscusi. It s available at the OraPerf web site at http://www.oraperf.com (a free registration is required).
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CHAPTER 22 PERFORMANCE TUNING: TUNING THE INSTANCE
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Once it starts executing a SQL statement, an Oracle process doesn t always get to work on the execution of the statement without any interruptions. Often, the process has to pause or wait for some resource to be released before it can continue its execution. Thus, an active Oracle process is doing one of the following at any given time: The process is executing the SQL statement. The process is waiting for something (for example, a resource such as a database buffer or a latch). It could be waiting for an action such as a write to the buffer cache to complete. That s why the response time the total time taken by Oracle to finish work is correctly defined as follows: response time = service time + wait time When you track the total time taken by a transaction to complete, you may find that only part of that time was taken up by the Oracle server to actually do something. The rest of the time, the server may have been waiting for some resource to be freed up or waiting for a request to do something. This busy resource may be a slow log writer or a database writer process. The wait event may also be due to unavailable buffers or latches. The wait events in the V$SYSTEM_EVENT view (instance-level waits) and the V$SESSION_EVENT view (session-level waits) tell you what the wait time is due to (full table scans, high number of library cache latches, and so on). Not only do the wait events tell you what the wait time in the database instance is due to, but they also tell you a lot about bottlenecks in the network and the application.
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It s important to understand that the wait events are only the symptoms of problems, most likely within the application code. The wait events show you what s slowing down performance, but not why a certain wait event is showing up in large numbers. It s up to you to investigate the SQL code to find out the real cause of the performance problems.
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Four dynamic performance views contain wait information: V$SESSION, V$SYSTEM_EVENT, V$SESSION_EVENT, and V$SESSION_WAIT. These four views list just about all the events the instance was waiting for and the duration of these waits. Understanding these wait events is essential for resolving performance issues. Let s look at the common wait events in detail in the following sections. Remember that the four views show similar information but focus on different aspects of the database, as you can see from the following summary. The wait events are most useful when you have timed statistics turned on. Otherwise, the wait events only have the number of times they occurred, not the length of time they consumed. Without timing the events, you can t tell if a wait event was indeed a contributing factor in a system slowdown.
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