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Some notifications are designed to retrieve values from subscribers. Such notifications must necessarily be delivered using procedure calls, because shared resource delivery supports a strictly one-way data flow. With multicast events, you can t use methods that simply return a value, because the method is called on multiple subscribers. You need to reconcile all the return values from each subscriber into a single master return value presented back to the event source. A simple technique to retrieve return values from multicast notifications is to use envelopes, described at the end of 4. An envelope is just an object that can hold other objects. If the envelope contains a collection, subscribers could return a value by adding it to the envelope s collection with an ad hoc AddValue method. When useful, the envelope could hide its contents from subscribers, allowing subscribers only to add (and not remove or browse) its contents. Upon return, the event sender would check the contents of the envelope, reconciling the returned values found.

If the shared pool and library cache latches are high, more often than not that s because the parse rates in the database are high The high parse rates are due to the following factors: An undersized shared pool (or an oversized shared pool) Failure to use bind variables Using dissimilar SQL statements and failing to reuse statements Users frequently logging off and logging back into the application Failure to keep cursors open after each execution Using a shared pool size that s too large The cache buffers LRU chain latch free wait is caused by high buffer cache throughput, either due to full table scans or the use of unselective indexes, which lead to large index range scans Unselective indexes can also lead to yet another type of latch free wait: the cache buffer chain latch free wait.

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These wait events are often due to the presence of hot blocks, so you need to investigate why that might be happening If you see a high value for row cache object latch waits, it indicates contention for the dictionary cache, and you need to increase the shared pool memory allocation In most instances, latch waits tend to show up as a wait event, and DBAs sometimes are alarmed by their very presence in the wait event list As with the other Oracle wait events, ask yourself this question: Are these latch waits a significant proportion of my total wait time If the answer is no, don t worry about it your goal isn t to try and eliminate all waits in the instance, because you can t do it..

Are there times, however, when you won t want to use it Absolutely, and fortunately they seem to be the exception and not the rule The automatic memory management was designed to be multiuser fair In anticipation of additional users joining the system, the automatic memory management will limit the amount of memory allocated as a percentage of the PGA_AGGREGATE_TARGET But what happens when you don t want to be fair, when you know that you should get all of the memory available Well, that would be the time to use the ALTER SESSION command to disable automatic memory management in your session (leaving it in place for all others) and to manually set your SORT|HASH_AREA_SIZE as needed.

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

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