1 : oracle immediately re-uses the space assigned to row-directory portion of the data block once you delete the corresponding rows.
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1. true
! a7 S: j8 a# F W% P' f" }& j 2. false
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* _& z9 x9 a& W; e0 f+ B4 [ q. 2 : which of the following three portions of a data block are collectively called as overhead. ( ^8 w: I s" ~
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1. table directory, row directory and row data
; x8 Y2 Z* T0 a3 p 2. data block header, table diretory and free space
5 ]) F; A# y! ]& o1 C( ~ 3. table directory, row directory and data blcok header
8 f6 w Z' d+ @/ U' e, R2 `+ a1 V 4. data block header, row data and row header " [) W" |4 P7 S( u
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( r6 P+ p4 O& X; W1 A: G q. 3 : which portion of the data block contains table or index data
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8 x' ?, p1 X2 Q 1. table directory 1 d0 P( c$ |6 y. [# [7 M8 \ h% y- f
2. row directory
! C4 `' n' z' C, @: E 3. overhead
8 Q4 \: r, a5 z9 n) _ 4. row data
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q. 4 : what are the two space management parameters for controling the use of free space in a data block 5 @) W2 X: W$ r. z: n- h
6 [) s1 F8 P) F& R% \1 a 1. initial and next
& d; ]' i6 o5 E( H. X2 W# I 2. pctfree and pctused
" J: l1 \2 U( A% F: n# V: m# R" w 3. tablespace and storage
+ g. o3 ^4 l5 Y0 @1 |6 Y 4. free space cannot be controlled at block level $ z; B+ V+ K* g5 W) _' |
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# b: B- t# L0 g7 J9 n& P. H q. 5 : the maximum number of transactions that a block can support is
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1. 100
* e' d+ i" x: L' ?6 A: x. H3 l 2. 255 7 M, ]/ M8 j3 ^$ e" g
3. 1000 + b2 `5 ~2 u- T! x# G* V9 l
4. unlimited / L" D. t$ P2 w, G3 s8 l
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q. 6 : what is pctfree # k8 u; u$ C& q9 g, s
$ i$ U' ]7 U7 F8 q6 q 1. a space management parameter which sets aside that much percentage of memory in the data block for future update of existing rows.
+ z$ N7 ]% C n) j o; l 2. a space management parameter which determines the minimum percentage of a block that can be used for row data plus overhead. r' I7 m/ s! M" J
3. a space management parameter which tells oracle that the block is available for inserts after the percentage of used memory falls below certain percentage. % { _% |1 T j& j+ K' s/ w7 k. _
4. all of them 7 s; T5 M$ s. {' A) S9 l
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! {2 a: L# v. r0 |. K q. 7 : what is the default value of next parameter ; d! O ~+ W/ y% ^$ D- }# m+ Q
- ]$ X& A& q+ G m4 ?7 S9 I 1. 1 block * p: b6 l5 E8 {/ w
2. 2 blocks
% O X+ s5 W1 } 3. 5 blocks 5 [) i" z, s) w5 j5 _2 T0 ~/ |- E
4. 100 blocks
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( N& _2 f7 {- N0 |+ _ q. 8 : which parameter reserves the more space for future updates
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% o+ T9 r: h1 s' E 1. high pctincrease
, z! y/ @" c# ~- b 2. high pctfree
4 _) ^0 C- q6 P! w, a4 T; [ 3. high initial $ x, P# Y, |9 j5 b4 X. A3 H
4. high pctused
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3 |: u- @/ W$ M q. 9 : pctfree and pctused together should not exceed 6 o9 [# y4 A/ T0 n1 K2 u- N0 ]
$ R. P' H8 @+ r4 h8 ? 1. 100 8 J! s# D4 p( @) v0 u0 [
2. 50 b/ u- K9 J" O: T% G8 d+ s
3. 25
) I/ V2 Y! D( X( Q. p 4. 10
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1
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q. 10 : row migration is a result of |
发表于 2012-8-4 14:01:27
