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摘要： Sometimes related to sorting operations, check to see if occurring primarily in temp tablespaces. During Direct Path operations the data is asynchronously read from the database files. At some point t... 阅读全文

摘要： Often related to sorting operations, check to see if occurring primarily in temp tablespaces.Solutions1) Reading from temp tablespacesIf the database parameter workarea_size_policy = AUTO:Increase the... 阅读全文

摘要： Direct path writes allow a session to queue an I/O write request and continue processing while the OS handles the I/O. If the session needs to know if an outstanding write is complete then it waits on... 阅读全文

摘要： During Direct Path operations, the data is asynchronously written to the database files. At some stage the session needs to make sure that all outstanding asynchronous I/O have been completed to disk.... 阅读全文

摘要： Waits on High Water enqueue occur when allocating space beyond the high water mark of a segment during insert operations. Also, this wait occurs when reclaiming free space in lob segments after delete... 阅读全文

摘要： Sessions waiting on this event are waiting on locks held during materialized view operations (such as refresh, alter) to prevent concurrent operations on the same materialized view.SolutionsA material... 阅读全文

摘要： New to Oracle 10g is the individual tracking of over 180 specific enqueues or internal Oracle locking mechanisms. One of these is the RO enqueue wait event for Object Reuse, and is used to synchronize... 阅读全文

摘要： This is an Exadata wait event that occurs when fast full index scans are offloaded to the storage cells. This event is related to cell smart table scan except that the object is an index.This event do... 阅读全文

摘要： This is an Exadata wait event that occurs when doing a restore via RMAN. Exadata automatically offloads RMAN restore activities to the storage cells.SolutionsOffloading the RMAN restore activity to th... 阅读全文

摘要： cell smart table scanThis is an Exadata wait event typically seen during full table scans that have been offloaded to the storage cells. This event replaces waits on "direct path read" in many cases. ... 阅读全文