DG vs Storage in High Availability -- From Oracle
網路傳輸量的分析:
Data Guard只傳輸一份日誌檔案
磁碟映象技術將傳輸交易所在的所有資料塊以及歸檔日誌、控制檔案等資料
磁碟映象技術無法區分出無效的IO,如大量臨時表操作、排序操作等產生的IO
投資回報率投資回報率(ROI)分析分析
Data Guard
Data Guard不需要單獨的license
備份資料庫可以建立在低檔系統和廉價的磁碟陣列中
網路只要求標準的TCP/IP、頻寬要求不高
Active Data Guard可以提高災備系統的投資利用
磁碟映象技術 單獨的軟體license(如SRDF、VeritasVVR等)
生產系統和備份系統必須儲存裝置同構
網路投資大:距離限制,大量網路中繼和轉發裝置
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