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The wait events listed in the sections that follow have a significant impact on system performance by increasing response times. Each of these events (and several other events) indicates an unproductive use of time because of an excessive demand for a resource, or contention for Oracle structures such as tables or the online redo log files.

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The buffer busy waits event occurs in the buffer cache area when several processes are trying to access the same buffer One session is waiting for another session s read of a buffer into the buffer cache This wait could also occur when the buffer is in the buffer cache, but another session is changing it You should observe the V$SESSION_WAIT view while this wait is occurring to find out exactly what type of block is causing the wait Two of the common causes of high buffer busy waits are contention on data blocks belonging to tables and indexes, and contention on segment header blocks.

If you re using dictionary managed tablespaces or locally managed tablespaces with manual segment space management (see 5), you should proceed as follows: If the waits are primarily on data blocks, try increasing the PCTFREE parameter to lower the number of rows in each data block You may also want to increase the INITRANS parameter to reduce contention from competing transactions If the waits are mainly in segment headers, increase the number of freelists or freelist groups for the segment in question, or consider increasing the extent size for the table or index The best way to reduce buffer busy waits due to segment header contention is to use locally managed tablespaces with ASSM ASSM also addresses contention for data blocks in tables and indexes Besides the segment header and data block contention, you could also have contention for rollback segment headers and rollback segment blocks.

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to refer to the vtable of its class For the classes Base and Derived, the compiler would automatically generate default constructors Since Base is the root of the inheritance hierarchy, there are no further base class constructors to call Therefore, the constructor of Base would only initialize the vtable pointer so that it refers to the vtable of Base The Derived constructor would first call the Base constructor and then initialize the vtable pointer to the Derived vtable The vtable of a native class only knows functions defined either in the class itself or its base classes Virtual functions called from a constructor or from a function that is directly or indirectly called from a constructor are dispatched to virtual functions known by the constructor s class, even if the class that is actually instantiated provides an override.

However, if you re using Automatic Undo Management (AUM), you don t have to do anything other than make sure you have enough space in your undo management tablespace to address the rollback (undo) headers and blocks, leaving table and index data blocks and segment headers as the main problem areas The following query clearly shows that in this database, the buffer busy waits are in the data blocks: SQL> SELECT class, count FROM V$WAITSTAT 2 WHERE COUNT > 0 3* ORDER BY COUNT DESC; CLASS COUNT ------------------ ---------data block 519731 undo block 5829 undo header 2026 segment header 25 SQL> If data-block buffer waits are a significant problem even with ASSM, this could be caused by poorly chosen indexes that lead to large index range scans You may try using global hash-partitioned indexes, and you can also tune SQL statements as necessary to fix these waits Oracle seems to.