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The db file sequential read wait event signifies that a single block is being read into the buffer cache. This event occurs when you re doing an indexed read and you re waiting for a physical I/O call to return. This is nothing to be alarmed about, because the database has to wait for file I/O. However, you should investigate disk I/O if this statistic seems extraordinarily high. If disk sorts are high, you can make them lower by increasing the value of the PGA_AGGREGATE_TARGET initialization parameter. Because the very occurrence of this event proves that your application is making heavy use of an index, you can t do much to reduce the demand for physical I/Os in this case, unlike in the case of the db file scattered read event. Increasing the number of disks and striping indexes across them may be your best bet to reduce db file sequential read waits. If the objects aren t too large, you can use the DEFAULT and KEEP buffer pools to retain them in memory. However, if the objects are large, you may not have this option. Indexed reads are going to show up in most systems as a wait, and it s not necessarily a bad thing, because indexes are required in most cases for faster data retrieval.
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The direct path read and direct path write events are waits that occur while performing a direct read or write into the PGA, bypassing the SGA buffer cache. Direct path reads indicate that sorts are being done on disk instead of in memory. They could also result from a busy I/O system. If you use automatic PGA tuning, you shouldn t encounter this problem too often. Automatic tuning of the PGA by Oracle should reduce your disk sorts due to a low PGA memory allocation. Another solution may be to increase the number of disks, as this problem also results in an I/O system that can t keep up with the increased requests for reading blocks into the PGA. Of course, tuning the SQL statements themselves to reduce sorting wouldn t hurt in this case.
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Free buffer waits usually show up when the database writer process is slow. The database writer process is simply unable to keep up with the requests to service the buffer cache. The number of dirty buffers in cache waiting to be written to disk is larger than the number of buffers the database writer process can write per batch. Meanwhile, sessions have to wait because they can t get free buffers to write to. First, you need to rule out whether the buffer cache is too small, and check the I/O numbers on the server, especially the write time, using an operating system tool. A check of the database buffer cache and a quick peek at the Database Control s Memory Advisor will show you the pattern of usage of the various memory components and if you re below the optimal buffer cache level, in which case you can increase the size of the buffer cache. Of course, if you re using Automatic Shared Memory Management, the database will size the SGA allocations for you.
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The other reason for a high number of free buffer waits in your system is that the number of database writer processes is inadequate to perform the amount of work your instance needs to get done. As you know, you can add additional database writer processes to the default number of processes, which is one database writer process for every eight processors on your host machine. If your database performs heavy data modifications and you determine that the database writer is responsible for wait events, you can reduce these waits in most cases by increasing the number of database writer processes. You can choose a value between 2 and 20 for the DB_WRITER_PROCESSES initialization parameter. Oracle recommends that you use one database writer process for every four CPUs on your system. You can t change this variable on the fly, so you ll need to perform a system restart to change the number of database writer processes.
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