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The log buffer space wait event indicates that a process waited for space in the log buffer. Either the log buffer is too small or the redo is being written faster than the log writer process can write it to the redo log buffer. If the redo log buffer is already large, then investigate the I/O to the disk that houses the redo log files. There s probably some contention for the disk, and you need to work on reducing the I/O contention. This type of wait usually shows up when the log buffer is too small, in which case you increase the log buffer size. A large log buffer tends to reduce the redo log I/O in general. Note that Oracle s default value for this parameter is several megabytes in size. If you have a large number of huge transactions, you might want to bump up the value of the LOG_BUFFER initialization parameter from its default value, although too high a value means that too much data may have to be written to the redo log files at one time.
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The log file switch wait event can occur when a session is forced to wait for a log file switch because the log file hasn t yet been archived. It can also occur because the log file switch is awaiting the completion of a checkpoint. If the problem isn t due to the archive destination getting full, it means that the archive process isn t able to keep up with the rate at which the redo logs are being archived. In this case, you need to increase the number of archiver (ARCn) processes to keep up with the archiving work. The default
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for the ARCn process is 2. This is a static parameter, so you can t use this fix to resolve a slowdown right away. You also need to investigate whether too-small redo log files are contributing to the wait for the log file switch. If the log file switch is held up pending the completion of a checkpoint, obviously the log files are too small and hence are filling up too fast. You need to increase the size of the redo log files in this case. Redo log files are added and dropped online, so you can consider this a dynamic change. If you see high values for redo log space requests in V$SYSSTAT, that means that user processes are waiting for space in the redo log buffer. This is because the log writer process can t find a free redo log file to empty the contents of the log buffer. Resize your redo logs, with the goal of having a log switch every 15 to 30 minutes.
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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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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: This is 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: This indicates the PMON process idle event. SQL*Net message from client: This is 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.
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