如何重置Exadata cell上的flash cache的内容

如何重置Exadata cell上的flash cache的内容？

可以通过以下命令实现：

cellcli
CellCLI: Release 11.2.3.1.1 - Production on Sun Sep 02 07:29:08 EDT 2012

Copyright (c) 2007, 2011, Oracle.  All rights reserved.
Cell Efficiency Ratio: 527

CellCLI> LIST FLASHCACHECONTENT where objectnumber=17425 detail
         cachedKeepSize:         8755838976
         cachedSize:             8757706752
         dbID:                   2080757153
         dbUniqueName:           DBM
         hitCount:               12940
         hoursToExpiration:      21
         missCount:              78488
         objectNumber:           17425
         tableSpaceNumber:       7

仅需要设置immediate cellsrv.cellsrv_flashcache(Reset,0,0,0) event，event的设置语法与普通的 RDBMS十分相似

CellCLI> alter cell events = "immediate cellsrv.cellsrv_flashcache(Reset,0,0,0)"
Cell dm01cel01 successfully altered

CellCLI> LIST FLASHCACHECONTENT where objectnumber=17425 detail

其他一些有用的命令：

将flashcache的状态转储到trace file中：

CellCLI> alter cell events = “immediate cellsrv.cellsrv_flashcache(dumpStats,0,0,12345)”

重置状态信息

CellCLI> alter cell events = “immediate cellsrv.cellsrv_flashcache(resetStats,0,0,0)”