 oraacle  RDBMS loo reedo lag ‌ lu antey emti ?
 oraacle  RDBMS  vaataavaranamlo ,  reedo lag ‌ lu yajamanya akrutilo fail ‌ lanu kaligi untai ,  idi databases ‌ ku chosen anni maarpula charitranu lag chesthundu .  prathi punaraavruta lag fail punaraavruta recordulanu kaligi umtumdi .  punaraavrutti namoodhu ani kudaa piluvabadee ooka punaraavruta recordu ,  maarpu wector ‌ l samuuhaanni kaligi umtumdi ,  veetilo prathi okkati databases ‌ loni oche black ‌ ku chosen maarpunu vivaristundi ledha suchisthundi .

 udaharanaku ,  ooka viniyogadaru udyoegi - sambandhitha deetaanu kaligi unna pattikalo jiitam - viilevanu app ‌ date cheestee , DBMS  table choose deetaa segment black ‌ loo maarpulanu vivarimchae maarpu - wector ‌ lanu kaligi unna punaraavruta rikard ‌ nu roopondistundi .  mariyu viniyogadaru app ‌ date ‌ ku kattubadi vunte ,  oraacle maroka punaraavruta rikard ‌ nu roopondistundi mariyu maarpuku  " sistom changes nambar " (SCN) ni ketayistundi .

 datafile ‌ loo edaina maarpu vachinappudalla ,  oraacle reedo lag ‌ loo maarpunu rikard chesthundu .  peruu  redo  lag dani prayojananni suchisthundi :  databases crashes ayinatlayithe , RDBMS  datafiles ‌ loni anni maarpulanu malli cheeyagaladu  ( malli prosess chesthundu ),  idi databases deetaanu chivariga punaraavrutam rikard cheesinappudu unna sthithiki teesukuvelutundi .  databases yokka punaraavruta lag girinchi samaachaaraanni kanugonadaniki  DBA lu  V$LOG, V$LOGFILE, V$LOG_HISTORY  mariyu  V$THREAD  veekshanhalanu upayogistaayi .  prathi punaraavruta lag fail khachitamgaa ooka samuuhaaniki chendinadi  ( veetilo kanisam remdu tappanisariga vundali ).  sariggaa yea samoohaalalo okati pratuta samuham  (v$log  yokka niluvu various sthithini upayoginchi prashninchavacchu ).  oraacle aa pratuta samuuhaanni reedo lag entreelanu vrayadaaniki upayogistundi .  samuham nindinappudu ,  lag svich yerpadutundi ,  maroka samuuhaanni pratuta samuhamga chesthundu .  prathi lag svich checq ‌ paayint ‌ ku kaaranamavuthundhi ,  ayithe ,  sambashana nijam kadhu :  checq ‌ paayint reedo lag svich ‌ ku kaaranam kadhu . ALTER SYSTEM SWITCH LOGFILE  aadesaanni upayoginchi manuval ‌ gaaa reedo - lag svich ‌ ku kudaa kaaranam kaavachhu .
Oracle RDBM loo ,  reedo lag ‌ lu anede databases ‌ loo maarpula charitranu nirvahinchadaaniki upayoegimchae lag ‌ lu .  deetaa fail ‌ ki linc cheyabadina prathi punaraavruta lag maarpu wector ‌ l samuuhaanni kaligi umdae bahulha punaraavruta recordulanu kaligi umtumdi .  crashes aynappudu databases ‌ ku maarpulanu vartimpajeyadaaniki lag ‌ lanu punaraavrutam cheyavachu mariyu perugutunna backup ‌ lanu roopondhinchadaaniki kudaa vupayogapaduthundi .