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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.

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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In order for T1 to use an instance of T3 without creating it, T1 must receive a reference to the T3 instance from another object. T1 might be given a T3 instance as a parameter in a method call. Although T1 has no control over what type of object it gets (there might be several classes derived from T2), it knows one thing: The instance must be of type T2 or a type derived from T2. With ambiguous coupling, T1 needs T2 to be available at compile time. T1 might not require T2 at run time if the compiler is able to bake a copy of T2 into T3, meaning that T2 s code is embedded somehow inside T3 s code.

name like '%ga memory%'; NAME VALUE ------------------------------ -----------session uga memory 312,952,440 session uga memory max 312,952,440 session pga memory 313,694,796 session pga memory max 313,694,796 Now, that is memory allocated in the PGA that the database itself cannot control We already exceeded the PGA_AGGREGATE_TARGET and there is quite simply nothing the database can do about it it would have to fail our request if it did anything, and it will do that only when the OS reports back that there is no more memory to give If we wanted, we could allocate more space in that array and place more data in it, and the database would just have to do it for us However, the database is aware of what we have done.

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.

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