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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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CH A PT ER 2 0 PERF O RMAN CE TUNI NG: TUN ING TH E I NS TA NCE
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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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Tip Use the wait event views (wait interface) for examining current and recent performance issues in your instance. For comprehensive analysis of most performance problems, you need to use the ADDM, which analyzes the AWR hourly snapshots.
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Oracle wait interface analysis has garnered quite a bit of attention in the last few years. There are entire books dedicated to Oracle waits. I discuss the important performance topic of Oracle wait analysis later in this chapter, in the section Analyzing Instance Performance. Ideally, all sessions should be on the CPU, with zero time spent waiting for resources such as I/O. However, remember that every working instance will have some kind of wait. It s unrealistic to expect to work toward a zero wait system. The key question should not be whether you have any Oracle wait events occurring, but rather if there are excessive waits.
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Wait Events and Wait Classes
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Any time a server process waits for an event to complete, it s classified as a wait event. There are more than 950 Oracle wait events in Oracle Database 11g. The most common wait events are those caused by resource contention such as latch contention, buffer contention, and I/O contention. A wait class is a grouping of related wait events, and every wait event belongs to a wait class. Important wait classes include Administrative, Application, Concurrency, Configuration, Idle, Network, System I/O, and User I/O. For example, the Administrative wait class includes lock waits caused by row-level locking. The User I/O class of waits refers to waits for blocks to be read off a disk. Using wait classes helps you move quickly to the root cause of a problem in your database by limiting the focus of further analysis. Here s a summary of the main wait classes in Oracle Database 11g: Administrative: Waits caused by administrative commands, such as rebuilding an index, for example. Application: Waits due to the application code. Cluster: Waits related to Real Application Cluster management. Commit: The single wait event log file sync, which is a wait caused by commits in the database. Concurrency: Waits for database resources that are used for locking, for example, latches. Idle: Waits that occur when a session isn t active, for example, the 'SQL*Net message from client' wait event. Network: Waits incurred during network messaging. Other: Miscellaneous waits. Scheduler: Resource Manager related waits.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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System I/O: Waits for background-process I/O, including the database writer background process s wait for the db file parallel write event. Also included are archive-log related waits and redo log read-and-write waits. User I/O: Waits for user I/O. Includes the db file sequential read and db file scattered read events.
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