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[考试试题] OracleDBA回滚段管理试题选(1)

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发表于 2012-8-4 14:01:27 | 显示全部楼层 |阅读模式
q. 1 : what system privilege is required to create a rollback segment ?  
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  1. create database  
- W, M. B6 B! V2 n  2. create rollback segment  % b  D- D6 I9 l
  3. alter database  
: H9 v" z* z; _  4. create segment  " v$ R# n# g3 G0 n6 j. v
  
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    : E# X. X% S8 s7 x0 f  z
  q. 2 : oracle recommends this number of minimum extents in a rollback segment  ; W& [/ O' M& S2 {' c( T
     Q4 M% a' L9 {! i) E( L) ?
  1. 0  
- m0 I9 b6 R8 b" y) s  2. 1  8 h4 ~& z2 U6 j" |1 ]# K8 F  D
  3. 2  
/ t  [7 D/ o7 j7 z) v0 f) L& \. B  4. 3  ! y9 L+ X7 k$ m' G8 X+ z3 v
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  3  
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8 @/ ^5 D; X# G- o& Z: E- K# p  q. 3 : oracle recommends that the following segment size when creating a rollback segment  . o3 q, X- i1 M/ s7 C- p2 b8 P
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  1. initial > next  * r) C3 w6 K9 f" y$ J1 _# P0 P
  2. initial = next  9 x6 ?! [8 ?' H" ~. ~3 [# l
  3. initial < next  5 k+ P' A5 Z/ S
  4. none of the above  
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  2   
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  q. 4 : the optimal parameter for a rollback segment should be set  - V( N# t- G; N0 h" ~6 e
  
% @6 F9 i- g9 }; n1 I  1. large for long-frequently running transactions, small for short transactions.  : V: m5 G. g  ]. t7 a
  2. small for long-frequently running transactions, large for small transactions.  
5 W# C" B+ h* G% M  3. small for all transactions  
& ?: ^8 H8 b/ A4 X+ y! V! x  4. large for all transactions  
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" o: \5 ]( p* B5 t* a+ A4 M" [# S( V  q. 5 : in case of system failure, this type of segment is used to undo the changes  
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  1. data segment  
! _* B0 X3 D6 e4 ~  l( ]  2. temp segment  , c# {  q& h% l
  3. redo segment    a) U* }4 `% ^
  4. rollback segment  + o. Y- z8 P8 w
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  4 : rollback segments are used to rollback information that has already been applied to database. during recovery, the database is rolled forward and then backwards to a consistent state.  ( U4 i- J1 Q9 M0 F* a! y0 I0 z
   
/ z' x5 v9 [! T9 b& Y8 I& ~+ Y  q. 6 : this is a valid storage parameter when creating a rollback segment  
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  1. freelists  
+ `: x8 Z. @' X6 O2 U- n/ n  2. optimal  7 C9 C9 L- b- W9 J- F. R* B
  3. partition  
. n3 [, g  J8 [* [0 L- E6 m$ L  4. none of the above  
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+ U2 {/ p; j3 {/ `  q. 7 : madhu created a couple of private rollback segments. what should he do now to make them online automatically during startup  + z) d8 {" u. S: E
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  1. grant online during startup to the segments  
5 k6 r) [' H8 Q  2. add rollback_segments=(rbs1,rbs2) in parameter file  2 N) e8 G" O3 z' Y  m/ R
  3. drop segments and recreate them as protected  0 V/ h. B' z: \  ^
  4. none of the above  ) P8 b+ \# f5 p& N8 c
  
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$ q  j, A0 d( ?* @* W" n9 p. L; ]  q. 8 : which is true regarding rollback segments  
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  1. system rollback segment cannot be put in an offline mode  ( v1 ~6 n0 U# w' i; K2 ~
  2. tablespaces containing rollback segments with active transactions can be put in offline mode  , {/ Y, S0 P& \- T: }5 p1 }* d  q: y
  3. all of the above  ' _1 w0 @# ^5 |4 j, N" m5 }
  4. none of the above
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