roll forward operation中文什么意思

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With five or more cpus , a mirror server distributes its roll forward operations among multiple threads during a failover this is known as parallel redo
如果cpu的數(shù)量為五個(gè)或更多時(shí)，鏡像服務(wù)器便會(huì)在故障轉(zhuǎn)移過(guò)程中，在多個(gè)線程之間分配其前滾操作（稱(chēng)為“并行重做
These failures are handled much the same way in db2 udb and oracle , by restoring either offline or online backups and using roll forward operations to recover the logs
在db2 udb和oracle中，這些失敗的處理方式大致是一樣的，都是通過(guò)脫機(jī)或聯(lián)機(jī)備份并使用前滾操作恢復(fù)日志來(lái)完成的。
When a user drops a table in db2 udb , you can either do a database level point - in - time recovery , rolling forward to the point before the table is dropped ; or , better still , use a table space level roll forward operation
當(dāng)用戶(hù)刪除db2 udb中的表時(shí)，您可以執(zhí)行數(shù)據(jù)庫(kù)級(jí)時(shí)間點(diǎn)恢復(fù)，前滾至刪除表之前的時(shí)間點(diǎn)；或者最好仍然使用表空間級(jí)的前滾操作。

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