Oracle 10g New Features: Flashback and RMANSubmitted by admin on Mon, 2004-04-26 00:00 RDBMS ServerTwo improvements have been made in the ba!up and reovery areas in "ra#e $0%& 'hen user errors and #o%ia# orruptions our in the database, (#ashba! (untiona#ities provide (ast and (#e)ib#e data reovery& 'hen physia# or media orruption ours in the database, RM*+ de#ivers an improved and simp#i(ied reovery method&,ere is a #ist o( e)tended (#ashba! (eatures:Flashback Database - This (eature introdues the -.*S,B*/0 D*T*B*S1 statement in S2.& 3t a##ows you to 4ui!#y brin% your database to a prior point in time by undoin% a## o( the han%es that have ta!en p#ae sine that time& This operation is (ast, beause you do not need to restore the ba!ups& This resu#ts in muh #ess downtime (o##owin% data orruption or human error&Flashback Standby Database - This (eature improves the swithover and (ai#over time o( a standby database& 5ou no #on%er need to spei(y a #o% app#y de#ay, beause you an now ro## ba! the standby database i( an error ours on the primary and is propa%ated to the standby&Flashback Reinstantiation - This (eature redues the need to reinstantiate the o#d primary database (o##owin% a (ai#over& This in turn #ets you restore (u## resi#ieny a(ter a (ai#ure more 4ui!#y& 5ou an do this by usin% the S2. statement -.*S,B*/0 D*T*B*S1 to ro## ba! theprimary database in time to synhroni6e with the standby database&Flashback Drop - "ra#e now provides a way to restore tab#es that were dropped aidenta##y&Flashback able - This (eature introdues the -.*S,B*/0 T*B.1 statement in S2., whih #ets you 4ui!#y reover a tab#e to a previous point in time without restorin% a ba!up&Flashback Row !istory - 7sin% undo data stored in the database, you an now view the han%es to one or more rows a#on% with a## the metadata o( the han%es&Flashback ransaction !istory - This (eature #ets you e)amine han%es to the database at the transation #eve#& 'ith (#ashba! transation history, you an dia%nose prob#ems, per(orm ana#ysis, and audit transations&,ere is a #ist o( enhaned RM*+ (eatures:Auto"ated #hannel Failo$er %or &ackup and Restore - Reovery Mana%er 8RM*+9 now automatia##y retries a (ai#ed ba!up or restore operation, reduin% the ris! o( strandin% you without a ba!up o( the "ra#e database beause o( an error&Auto"ated File #reation During Reco$ery - This (eature enhanes RM*+ reovery by automatia##y reatin% and reoverin% data(i#es that have never been ba!ed up&Si"pli%ied &ackups to Disk - 3ma%e ba!ups provide (ast reovery by bein% readi#y usab#e& TheReovery Mana%er 8RM*+9 B*/07: ommand has been enhaned to per(orm ima%e opy ba!ups at the database, tab#espae, and data(i#e #eve#&'ro(y #opy &ackup o% Archi$elogs - 5ou an now ba! up arhive #o%s by usin% the Reovery Mana%er 8RM*+9 :ro)y /opy&)ncre"entally *pdated &ackups - 5ou an now app#y a Reovery Mana%er 8RM*+9 inrementa# ba!up to a data(i#e ima%e ba!up& This resu#ts in redued reovery time, beause (ewer #o%s need to be app#ied, and redued time to ba! up the database, beause you do not a#ways have to ba! up the who#e database&Si"pli%ied Reco$ery hrough Resetlogs - 5ou no #on%er have to ba!up your database (o##owin% an inomp#ete reovery or an ":1+ R1S1T.";S operation& This is an enab#in% (eature (or -#ashba! Reinstantiation&Full Database &egin &ackup #o""and - 3t is no #on%er neessary to issue a separate ommand to p#ae eah tab#espae in hot ba!up mode& 5ou an now use the *.T1R D*T*B*S1 statement to p#ae a## tab#espaes in ba!up mode& *#so, the B1;3+ B*/07: ommand now runs (aster than be(orehanges to the A+,R DAA&AS, ,ND &A#-*' #o""and - 5ou an issue the *.T1R D*T*B*S1 1+D B*/07: ommand when the database is openhange.Aware )ncre"ental &ackups - By usin% a new type o( #o% (i#e to tra! b#o!s that havehan%ed in the database, Reovery Mana%er 8RM*+9 an avoid sannin% the entire data(i#e durin% an inrementa# ba!up& 3nstead, the amount o( data sanned is proportiona# to the amount o( data han%ed&Auto"ated Disk.&ased &ackup and Reco$ery - This re#ease supports automated dis!-based ba!up and reovery& The resu#t is a simp#i(ied and uni(ied stora%e #oation (or ba!ups, arhive#o%s, and any other (i#es needed (or "ra#e reovery& 3t a#so provides automati de#etion o( the (i#es a(ter they have been suess(u##y ba!ed up by RM*+, and the e4uiva#ent o( a dis! ahe (or tape, whih redues the time needed to restore a (i#e (rom tape& 3t redues the ris! o( an out-o(-spae ondition on dis! by de#etin% (i#es that are no #on%er neessary (or suess(u# database reovery&RMAN Database Dropping and Deregistration - The new DR": D*T*B*S1 and 7+R1;3ST1R D*T*B*S1 RM*+ ommands remove the database and its entry (rom the RM*+ reovery ata#o%&Auto"ated S')R )nstantiation - This (eature automatia##y reates the au)i#iary instane needed to per(orm tab#espae point-in-time reovery 8TS:3TR9 and inorporates the RM*+ TS:3TR operations&Si"pli%ied Reco$ery Manager #ataloging o% &ackup Files - 5ou an now ata#o% RM*+ proprietary ba!up metadata into a ba!up repository& 3( a ba!up is overwritten in the ontro# (i#e, or a ba!up (i#e is moved to a new #oation on dis!, then you an easi#y unata#o% the ba!up metadata (rom the repository&,(tended Flashback Functions3n "ra#e $0%, the (#ashba! (untiona#ity has been %reat#y e)tended&Flashback Database-#ashba! Database is (aster than traditiona# point-in-time reovery& Traditiona# reovery uses redo #o% (i#es and ba!ups& -#ashba! Database is imp#emented usin% a new type o( #o% (i#e a##ed -#ashba! Database #o%s& The "ra#e database server periodia##y #o%s be(ore ima%es o( data b#o!s in the -#ashba! Database #o%s& The data b#o! ima%es are used to 4ui!#y ba! out han%es to the database durin% -#ashba! Database&-#ashba! Database redues the time re4uired to reover the database to a previous point& The time to restore a database is proportiona# to the number o( han%es that need to be ba!ed out, not the si6e o( the database&R/0R &ackground 'rocess'hen -#ashba! Database is enab#ed, a new R origi!al_!ae> tLpe fro Mser_recLclebi!5.7N02(_/)-0.*3@3/)&_/)-0(=,0------------------------ ---------------- ------------------*7$$42513$()7&0$0(0$( ()7&0$%&' create table test Hcol_b