oracle active data guard real-time apply特性
real-time apply何時出現
經查閱官方手冊,real-time apply始自oracle10,到底是oracle 10g1或是oracle 10gr2,我沒有進一步細核。real-time apply含義
只要主庫產生的重作日誌直接經備庫的RFS程式寫入到備庫的standby redo log file,馬上經過備庫的mrp程式(即介質恢復程式)直接應用到備庫。real-time apply作用
這樣一旦出現failover或switchover宣告或故障時,主備切換時間更短更快,進而主備庫資料同步一致性程度更高。因為傳統的機制是主庫重作到達備庫後,先要生成standby redo log file,然後對其進行歸檔,然後通過備庫MRP程式再對歸檔檔案進行應用。這樣一來一回,主備資料延遲可想而知。real-time apply功能架構
來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/9240380/viewspace-2149235/,如需轉載,請註明出處,否則將追究法律責任。
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