ORACLE数据库服务热线：13764045638 诗檀软件

摘要： This is a read from a single copy of the control file. This happens in many cases. For example, while:Making a backup of the controlfilesSharing information (between instances) from the controlfileRea... 阅读全文

摘要： A session waits on this event when it is requesting a mutex in shared mode, when another session is currently holding a this mutex in exclusive mode on the same cursor object.SolutionsSolutions for mu... 阅读全文

摘要： A session waits on this event when it has requested a mutex for a cursor object in exclusive mode but must wait because it is busy. The mutex is busy because either the mutex is being held in exclusiv... 阅读全文

摘要： A session waits on this event when it wants to update a shared mutex pin and another session is currently in the process of updating a shared mutex pin for the same cursor object. This wait event shou... 阅读全文

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： Waits on 'db file sequential read' normally occur during index lookups when the block is not in memory and must be read from disk. They are generally considered a 'good' read unless the index being us... 阅读全文

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