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摘要： A session waits on this event when requesting a mutex for sharable operations related to pins (such as executing a cursor), but the mutex cannot be granted because it is being held exclusively by anot... 阅读全文

摘要： A session waits on this event when it is requesting an exclusive mutex pin for a cursor object and it must wait because the resource is busy. The mutex pin for a cursor object can be busy either becau... 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

摘要： This event indicates the session is currently waiting on the Undo Segments and is often related to using system managed undo with an auto tuned undo retention period. In 10g, Oracle added the _undo_au... 阅读全文

摘要： Enqueues are sophisticated locks for managing access to shared resources like tables, rows, jobs, and redo threads. An enqueue can be requested in different levels/mode: null, row share, row exclusive... 阅读全文

摘要： This wait event is experienced whenever the database needs to open a file. Wait time is recorded beginning just prior to when the open request is issued until the time the request is returned, having ... 阅读全文

摘要： ProblemThis will happen if there is no free buffer in the buffer cache for the session to read a new block into. All buffer gets have been suspended.This will frequently occur because DBWR is not writ... 阅读全文

摘要： This wait, also known as global cache buffer busy prior to Oracle 10g, specifies the time the remote instance locally spends accessing the requested data block. This wait event is very similar to the ... 阅读全文