flashback snapshot of schema

8/17/2019 Flashback Snapshot of Schema

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Flashback Snapshot of Schema

Few days ago, one of my clients performed a "drop" action occidentally on the website. But he could not confirm what he dropped is correct or not. He want to see thescreen before he dropped the items.

The first thought we got is to utilize flashback query. Howeer, this simple actionactually deleted important data from many tables !oer #$, and the code of displayingthe i is fairly comple%. Flashback query doesn&t help in this case. 'e finally e%portedentire schema using e%pdp with flashback(time option, and imported it to a testenironment.

) eer thought if oracle proided a session parameter flashback(scn*flashback(time toallow the user flashback query all of data to a specified scn*timestamp in the session,it will make things simple. 'hat we need to do is to create a new connection, andchange this parameter after connected to database.

Then ) was thinking can ) find a workaround way+ ) finally got one. ) can build a newschema, then create a set of iews referring to the e%isting schema, inoling theflashback query feature. nd ) can use a "global parameter" to control the flashbackscn*timestamp.

Here is the code.

SQL

1. -- ################################################################################

2. -- #

3. -- # $Id: schema_snapshot.sql

4. -- #

5. -- # File: $RCSile: schema_snapshot.sql!" $

. -- # esc%iption: c%eate a snapshot o% a schema

&. -- # 'sa(e: sqlpl)s -s *nolo( +schema_snapshot ,eistin(_schema_name ,snapshot_schema_name

/. -- # C%eated: 0&*02*2014


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. -- # )tho%: ei )an(

10. -- # 'se% %)n as: * as ssd6a 78S )se% sho)ld 6e o%acle o9ne%

11. -- # ;a%amete%s: 1: eistin( schema name

12. -- # ;a%amete%s: 2: ne9 schema name

13. -- # ;a%amete%s: 3: snapshot timestamp

14. -- #

15. -- # Cop%i(ht 7c 2014 ei )an(

1. -- #

1&. -- # isto%

1/. -- #


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35. CRBB 8R RB;DCB ;CEB @2."a%_pG( IS

3. "a% "a%cha%27255=

3&. ;R8CB'RB set_"a%7"al "a%cha%2=

3/. )nction (et_"a% %et)%n "a%cha%2=

3. BH "a%_pG( =

40. *

41.

42. CRBB 8R RB;DCB ;CEB 8J @2."a%_pG( IS

43. ;R8CB'RB set_"a%7"al "a%cha%2 IS

44. BIH

45. "a% :> "al=

4. end set_"a%=

4&.

4/. )nction (et_"a% %et)%n "a%cha%2

4. IS

50. BIH

51. %et)%n "a%=

52. BH (et_"a%=

53. BH "a%_pG(=

54. *

55. K?=

5.

5&. execute immediate sql_st%=

5/. for q in 7select ?(%ant select!lash6acG on ?LLo9ne%LL?.?LLta6le_nameLL? to?LL)ppe%7?@2?LL?=? st% from d6a_ta6les where o9ne%>)ppe%7?@1? loop

5. execute immediate q.st%=

0. end loop=


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1. for q in 7select ?c%eate o% %eplace "ie9 ?LL)ppe%7?@2?LL?.M_?LLta6le_nameLL? as select N %om ?LLo9ne%LL?.?LLta6le_nameLL? as o timestamp to_timestamp7"a%_pG(.(et_"a%!??mmddhh24miss??=? from d6a_ta6les where o9ne%>)ppe%7?@1? loop


3. end loop=

4. for q in 7select ?c%eate o% %eplace snonm ?LL)ppe%7?@2?LL?.?LLta6le_nameLL? o% ?LL)ppe%7?@2?LL?.M_?LLta6le_nameLL?=? from d6a_ta6les where o9ne%>)ppe%7?@1? loop


. end loop=

&.

/. @2."a%_pG(.set_"a%7?@3?=

. end i=

&0. end =

&1. *

This will generate the code to create a "snapshot schema". -lients connecting thisschema will query all the data before the specified time. f course, if there are

procedures*iews in the e%isting schema, they should be created in the new schemareferring to those synonyms.

Consistent Gets may not tell the truth

-onsistent gets is important statistics data indicating the performance of a /01. )t&s ametric data for us to tune /01. 2ormally, we may compare the performance of two/01 or same /01 with different e%ecution plan. Howeer, sometimes, -3 may nottell us the release performance of /01.

1et&s reiew below 4 statistics data output first.

SQL

1. SOD 1:

2. Statistics


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3. ----------------------------------------------------------

4. 0 %ec)%si"e calls

5. 0 d6 6locG (ets

. 40 consistent (ets

&. 0 phsical %eads

/. 0 %edo size

. 12035/3 6tes sent "ia SODNHet to client

10. 3// 6tes %ecei"ed "ia SODNHet from client

11. 30 SODNHet %o)ndt%ips to*from client

12. 0 so%ts 7memo%

13. 0 so%ts 7disG

14. 453 rows p%ocessed

15.

1. SOD 2:

1&. Statistics

1/. ----------------------------------------------------------

1. 0 %ec)%si"e calls

20. 0 d6 6locG (ets

21. 1& consistent (ets

22. 0 phsical %eads

23. 0 %edo size

24. 2&325 6tes sent "ia SODNHet to client

25. 3// 6tes %ecei"ed "ia SODNHet from client

2. 30 SODNHet %o)ndt%ips to*from client

2&. 1 so%ts 7memo%

2/. 0 so%ts 7disG

2. 453 rows p%ocessed


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The consistent gets of the st /01 is almost 5 times of the 4nd one. /eems the 4ndmust hae better performance. )sn&t it+

k, let&s go back to see how did these data got.

SQL

1. ello.C8


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24.

25. Bec)tion ;lan

2. ----------------------------------------------------------

2&. ;lan hash "al)e: 31&2013

2/.

2. --------------------------------------------------------------------------

30. L Id L 8pe%ation L Name L Rows L tes L Cost 7PC;'L Time L

31. --------------------------------------------------------------------------

32. L 0 L SELECT SB


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51. ello.C8?SJS?=

52.

53. 453 rows selected.

54.

55. Blapsed: 00:00:00.23

5.

5&. Bec)tion ;lan

5/. ----------------------------------------------------------

5. ;lan hash "al)e: 132314/2&

0.

1. -----------------------------------------------------------------------------


3. -----------------------------------------------------------------------------

4. L 0 L SELECT SB


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&/. ----------------------------------------------------------

&. 0 %ec)%si"e calls

/0. 0 d6 6locG (ets

/1. 1& consistent (ets

/2. 0 phsical %eads

/3. 0 %edo size

/4. 2&325 6tes sent "ia SODNHet to client

/5. 3// 6tes %ecei"ed "ia SODNHet from client

/. 30 SODNHet %o)ndt%ips to*from client

/&. 1 so%ts 7memo%

//. 0 so%ts 7disG

/. 453 rows p%ocessed

These 4 /01s are simple. )f we ignore the performance statistics data, we can easilydetermine their performance from their logical structure or from their e%ecution plan666 The performance of the st one must be better than the 4nd one, because there isone more full table scan in the e%ecution plan.

Then why the 4nd one has less consistent gets+

/et /01 Trace for them, and then look into the formatted trace file.

SQL

1. Rows 71st Rows 7a"( Rows 7 max Ro9 So)%ce 8pe%ation

2. ---------- ---------- ---------- ---------------------------------------------------

3. 453 453 453 1& p%>0 p9>0 time>3/433 )s cost>52 size>11/5 ca%d>453

4. 1 1 1 TABLE CCBSS !LL 2 7c%>3 p%>0 p9>0 time>&/)s cost>3 size>113 ca%d>1

5. 453 453 453 'FFBR S8R 7c%>14 p%>0 p9>0 time>225/ )scost>4 size>110424 ca%d>453

. 453 453 453 TABLE CCBSS !LL 1 7c%>14 p%>0 p9>0 time>11/15 )s cost>4 size>110424 ca%d>453


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This is the plan statistics data of the 4nd /01. biously, there are 4 parts ofconsistent gets, FT/ on t and FT/ on t4.

)n this plan, FT/ on t is 78. But why the st /01 got 877+ That is because of fetcharray size. 9efault array size of /01:;lus is


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SQL

1. ello.C8


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4. 54 54 54 TABLE CCBSS !LL 2 7c%>55 p%>0 p9>0 time>&2/ )s cost>3 size>102 ca%d>54

5. 24402 24402 24402 'FFBR S8R 7c%>14 p%>0 p9>0 time>43354 )scost>2550 size>110424 ca%d>453

. 453 453 453 TABLE CCBSS !LL 1 7c%>14 p%>0 p9>0 time

>10&4 )s cost>4& size>110424 ca%d>453

- of FT/ on t is unchanged, while - of FT/ on t4 is increased to


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/. ----------------------------------------------------------

. ;lan hash "al)e: &/&4&3//

10.

11. -----------------------------------------------------------------------------


13. -----------------------------------------------------------------------------

14. L 0 L SELECT SB


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lthough the e%ecution plan is not changed, the consistents gets is increasedsignificantly.

'hat we should note from this case is,

Fetch array size affects the consistent gets.

-onsistent gets statistics data will only include the gets from shared buffer

Test enironment? racle .4.#.5 on racle 1inu% < 78bit

One single SQL helps you to analyze the

performance of a SQL

This is the script ) am using to analyze /01 performance. )t maDor contains one /01only. )t can show below information if aailable. nd you can shoose to show parts of

them.

• : >onitored*-aptured Bind Iariables

• : /01 Te%t

• : C%ecution ;lan

• : ;eeJed Binds of the e%ecution plan

• : ;lan utline 9ata

• : ;lan ;redicate

• : ;lan 1ines 1oading

• : 'ait eents


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• : ;erformance /tatistics 9ata

C%ample?

SQL

1. ello.C8


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23. exec :I?I&

2. exec :I:>231

2&.

2/. --SI: 1&0!511&5

2. "a% CCB;IS MRCR2732

30. "a% BH231

45.

4.

4&. ------------- SOD et --------------

4/.

4. SELECT *NT leadin(7oe % l N*


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50. *N SH_RB;_8;_;R8F N*

51. mlelement7

52. top_p%oiles!

53. mla((7mlelement7o6U_id! o6Uect_id

54. R#$ 7SELECT tasG_id! eec_name! eec_id! eec_sta%t! o6Uect_id! sql_id!

55. pa%sin(_schema! ph"! o6U_att%/

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5&. e.tasG_id tasG_id!

5/. e.eec)tion_name eec_name!

5. e.eec)tion_id eec_id!

0. e.eec)tion_sta%t eec_sta%t!

1. o.id o6Uect_id!

2. o.att%1 sql_id!

3. o.att%3 pa%sin(_schema!

4. to_n)m6e%7n"l7o.att%5! ?0? ph"!

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/. order b" 6itand7o.att%&! 32 asc!

. e.eec)tion_sta%t desc

&0. %n

&1. R#$ 7SELECT e.tasG_id! e.name eec)tion_name! e.id eec)tion_id!

&2. e.eec_sta%t eec)tion_sta%t! e.stat)s stat)s#

&3. R#$ 7SELECT tasG_id!

&4. min7eec)tion_name Geep 7dense_%anG first order b"

&5. eec)tion_sta%t 6ename!


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&. max7eec)tion_name Geep 7dense_%anG last order b"

&&. eec)tion_sta%t eename!

&/. min7eec)tion_sta%t 6esta%t!

&. max7eec)tion_sta%t eesta%t

/0. R#$ 7SELECT tasG_id! name eec)tion_name!

/1. eec_sta%t eec)tion_sta%t

/2. R#$ 9%i$_ad"_eec)tions

/3. %&ERE tasG_id > :tid and

/4. name in 7:6ename! :eename

/5. 'R#!( B) tasG_id %!

/. 9%i$_ad"_eec)tions e

/&.

//.

/. %&ERE e.tasG_id > %.tasG_id and

0. e.eec_sta%t > 6esta%t and

1. e.eec_sta%t ,> eesta%t and

2. e.stat)s IH 73! 4 and

3. 76ename , eename 8R e.name > 6ename e *N e N*!

4. 9%i$_ad"_o6Uects o

5. %&ERE o.tasG_id > e.tasG_id H

. o.eec_name > e.eec)tion_name H

&. o.tpe > :sqltp

/. %&ERE %n > 1 oe *N oe N*!

. 9%i$_ad"_indin(s !

100. 9%i$_ad"_%ecommendations %!

101. 9%i$_ad"_%ationale l

102. %&ERE oe.tasG_id > .tasG_id H oe.eec_name > .eec_name H


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103. oe.o6Uect_id > .o6U_id H .tasG_id > %.tasG_id H

104. .eec_name > %.eec_name H .id > %.indin(_id H

105. l.tasG_id > %.tasG_id H l.eec_name > %.eec_name H

10. l.%ec_id > %.id H

10&. %.tpe > :p%oiletp H l.tpe > :impltp H

10/. l.att%1 > :acceptdis H

10. H8 BVISS 7SELECT 1

110. R#$ d6a_sql_p%oiles p

111. %&ERE p.tasG_id > %.tasG_id H

112. p.tasG_eec_name > %.eec_name H

113. p.tasG_o6U_id > oe.o6Uect_id H

114. p.tasG_nd_id > %.indin(_id H

115. p.tasG_%ec_id > %.id

11.

11&.

11/. ------------- SOD ;lan 7;lan ash Mal)e:5/3&// --------------

11.

120. 0 7 SELECT SBDD_R8S

121. 1 70 S8R 7RBB

122. 2 71 HBSB D88;S 7HI 7Cost>30 Ca%d>11 rows tes>0*12

123. 3 72 HBSB D88;S 7Cost>2 Ca%d>11 rows tes>0*12


125. 5 74 HBSB D88;S 7Cost> Ca%d>0/ rows tes>0*54

12. # 75 *+E% 7Cost>/ Ca%d>2/ rows tes>0*31

12&. #& 7 IH8 7S8R ;'SB RHE 7Cost>/ Ca%d>4/ rows tes>0*123

12/. / 7& HBSB D88;S


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12. 7/ HBSB D88;S 7Cost>& Ca%d>1& rows tes>0*123

130. 10 7 HBSB D88;S 7Cost>5 Ca%d>33 rows tes>0*/4

131. 11 710 *+E% 7Cost>3 Ca%d>1 rows tes>0*5&

132. 12 711 S8R 7'R#!( B) 7Cost>3 Ca%d>1 rows tes>0*24

133. 13 712 TABLE CCBSS 7B) +N,E- R8I # ?RI$_M_BVBC'I8HS? 7TABLE 7Cost>3 Ca%d>2 rows tes>0*24

134. N#14 713 +N,E- 7RHB SCH # ?RI$_M_BVBCS_;E? 7+N,E- 7!N+Q!E 7Cost>2 Ca%d>2 rows tes>0*

135. #15 710 TABLE CCBSS 7B) +N,E- R8I # ?RI$_M_BVBC'I8HS? 7TABLE 7Cost>2 Ca%d>33 rows tes>0*2&

13. N1 715 +N,E- 7RHB SCH # ?RI$_M_BVBCS_IV_03? 7+N,E- 7Cost>1 Ca%d>33 rows tes>0*

13&. N1& 7 +N,E- 7RHB SCH # ?RI$_M_8QBCS_IV_01? 7+N,E- 7!N+Q!E 7Cost>1 Ca%d>1& rows tes>0*

13/. #1/ 7/ TABLE CCBSS 7B) +N,E- R8I # ?RI$_M_8QBCS? 7TABLE 7Cost>2 Ca%d>134 rows tes>0*2&3

13. N1 75 +N,E- 7RHB SCH # ?RI$_M_FIHIHS_IV_02? 7+N,E- 7!N+Q!E 7Cost>1 Ca%d>0/ rows tes>0*23

140. #20 74 TABLE CCBSS 7B) +N,E- R8I # ?RI$_M_RBC815 rows tes>0*3

141. N21 720 +N,E- 7RHB SCH # ?RI$_M_RBCS_IV_02? 7+N,E- 7!N

+Q!E 7Cost>1 Ca%d>345 rows tes>0*

142. #22 73 TABLE CCBSS 7B) +N,E- R8I # ?RI$_M_RI8HDB? 7TA BLE 7Cost>15 Ca%d>11 rows tes>0*3

143. N23 722 +N,E- 7RHB SCH # ?RI$_M_RI8HDB_;E? 7+N,E- 7!N+Q!E 7Cost>3 Ca%d>2&23304 rows tes>0*

144. 24 72 *+E% ;'SB ;RBICB # ?M_SO_1? 7 *+E% 7Cost>4 Ca%d>0 rows tes>0*



14&. N2& 72 S Q8IH 7Cost>4 Ca%d>0 rows tes>0*1/

14/. #2/ 72& TABLE CCBSS 7B) +N,E- R8I # ?SOD8Q$'V? 7TABLE 7Cost>2 Ca%d>0 rows tes>0*42

14. N2 72/ +N,E- 7RHB SCH # ?I_SOD8Q$'V_SE? 7+N,E-7Cost>1 Ca%d>0 rows tes>0*


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150. N#30 72& +N,E- 7SEI; SCH # ?SOD8Q$_;EBJ? 7+N,E- 7!N+Q!E 7Cost>1 Ca%d>0 rows tes>0*322

151. N31 72 +N,E- 7!N+Q!E SCH # ?I_SOD$BV_;EBJ? 7+N,E- 7!N+Q!E

152. N32 725 +N,E- 7!N+Q!E SCH # ?I_SOD$_;EBJ? 7+N,E- 7!N+Q!E

153.

154. ------------- ;%edicate Ino%mation 7;lan ash Mal)e:5/3&// --------------

155.

15. Filte%: RH>1

15&. & Filte%: R8_H'.SIH'RB H S8.CB8RJ>.CB8RJ

1&0. 2/ Filte%: .8Q_J;B>1

1&1. 2 ccess: .SE_I>R.SE_I H .SE_BVBC_HR.BVBC_H8QBC_I H .SE_FH_I>R.FIHIH_I H .SE_RBC_I>R.I


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1&2. 30 ccess: S8.8Q_J;B>1

1&3. 30 Filte%: S8.8Q_J;B>1

1&4. 31 ccess: S8.SIH'RB>S.SIH'RB

1&5. 32 ccess: S8.SIH'RB>SO.SIH'RB

1&.

1&&. ------------- ;lan Doadin( 7;lan ash Mal)e:5/3&// --------------

1&/.

1&. 22: TABLE CCBSS B) +N,E- R8I #############################################7/.4&P

1/0. 23: +N,E- RHB SCH #####710.53P

1/1.

1/2. ------------- aits B"ents 7;lan ash Mal)e:5/3&// --------------

1/3.

1/4. #N C;' on SJS.RI$_M_RBCS_IV_027+N,E-#####7.5P

1/5.

1/. ------------- Statistics ata --------------

1/&.

1//. Doads: 1

1/. Load Me%sions: 1

10. irst Load Time: 2014-03-12*22:4:24

11. Last Load Time: 2014-03-12*22:4:24

12. 'se% 8penin(s: 0

13. ;a%se Calls: 11

14. Bec)tions: 11

15. So%ts7"e%a(e: 2

1. Fetches7"e%a(e: 1

1&. isG Reads7"e%a(e: .545


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1/. )e% ets7"e%a(e: 141/43.34

1. Blapsed Time7"e%a(e: 10.50& seconds

200. C;' Time7"e%a(e: 10.501 seconds

201. R)n Time


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SELECT (!)*+_name,m- no_mere,/inv- 0O_MER1E,/2SEL32-!(stat4s5 s

6 7ROM ,sele8t (!)*+_name,inv- no_mere,v-!(o.o9ner5 o.stat4s5o.o+:e8t_name5 o.8reate$5 t.ta+lesa8e_name &rom v_o+:e8ts_s;s o5 t_ta+les t

9


25/49

Comparing the trace content. )e can /nd the optimizer performed simple /lter push

analysis'

7D Consi$erin simle &ilter 4s< ,re re9rite- in *4er; +lo8 M ,N-

7D C4rrent 9


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MODEL_COMPILE_SUBQUERY

&sage' MO!L"COMP#L!"S&6Q&!3%

escription' &n5no)n* #t might ,e used for model (uery transformation*

MODEL_DONTVERIFY_UNIQUENESS

&sage' MO!L"O$+7!3#4%"&$#Q&!$!SS


MODEL_DYNAMIC_SUBQUERY

&sage' MO!L"%$AM#C"S&6Q&!3%


Partitioning Hints8"%$"P3&$!

&sage' 8"%$"P3&$!

escription' #nstructs the SQL e9ecutor to using the result of su, (uery to prune the

partitions dynamically*

HELLODBA.COM>alter session set tra8e&ile_i$enti&ier = '


27/49

HELLODBA.COM>e%e8 s*l_e%lain,'sele8t (!)4se_


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HELLODBA.COM>e%e8 s*l_e%lain,'sele8t (!) 4se_mere,tr t- SBQERG_R0F01,trARTFTFO0-!(tr.! &rom t_o+:e8ts_rane tr5 t_ta+les t 9


29/49

escription' Pre0ents the optimizer to using su, (uery to prune the partitions dynamically*

HELLODBA.COM>e%e8 s*l_e%lain,'sele8t (!)0O_SBQERG_R0F01,O ARTFTFO0-LEADF01,4-!(o.! &rom t_o+:e8ts_rane o5 t_ta+les t5 t_4sers 4 9?@6loc5B @+a,leBD


30/49

escription' #nstructs the optimizer to con0ert the O,Eect to a relational ta,le. similar to

3!LA+#O$AL function*

HELLODBA.COM>$es8 %mlta+le

0ame 04ll T;e

TABLE o& BLFC.MLTGE

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SGS_0C_RO?F07O3

@ot

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@

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... ...

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SGS_0C_OFD3 MLDATA

ABC6CDAIKJ76IAAKJII@ot@o4tline_$ata>@@F10ORE_OTFM_EMBEDDED_HF0TS>@(F10ORE_OTFM_EMBED

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0ABLE>@(@@Y[CDATA[ALL_RO?S"">@(@@OTLF0E_LEA7>2SEL36BAJADC2

MONITOR

&sage' MO$#+O3

escription' #nstruct Oracle monitor the running status of the statement. regardless of

)hether it ful/lls the criteria >Parallel Query or 3unning for more than F secondsD or not*

HELLODBA.COM>ssele8t (!) monitor !(8o4nt,!- &rom t_4sers 4#

CO0T,!-

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'ZmonitorZ'#

SQL_TET STATS

sele8t (!) monitor !(8o4nt,!- &rom t_4sers 4 DO0E ,ALL RO?S-

NO_MONITOR

&sage' $O"MO$#+O3

escription' Pre0ent Oracle monitor the running status of the statement. regardless of

)hether it ful/lls the criteria >Parallel Query or 3unning for more than F secondsD or not*

HELLODBA.COM>sele8t (!) no_monitor arallel,o - &4ll,o- !( (!i$enti&ier!(8o4nt,!- &rom t_o+:e8ts o#

CO0T,!-

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(

T;e 8reate$.

HELLODBA.COM>CREATE TABLE t_nt_ta+le ,a 0MBER5 + simle_t;e- 0ESTED TABLE +STORE AS t_nt_+#

Ta+le 8reate$.

HELLODBA.COM>F0SERT (!) !( F0TO t_nt_ta+le sele8t o+:e8t_i$5simle_t;e,o+:e8t_name- &rom t_o+:e8ts#

JJ ro9s 8reate$.

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Elase$ H.HK

NESTED_TABLE_GET_REFS

&sage' $!S+!"+A6L!"G!+"3!4S

escription' 1ith this hint. user can access to nested ta,le directly*


34/49

HELLODBA.COM>sele8t (!) !(8o4nt,!- &rom T_0T_B#

sele8t (!) !(8o4nt,!- &rom T_0T_B

!

ERROR at line J

ORAIJ 8annot re&eren8e neste$ ta+le 8ol4mn's storae ta+le

HELLODBA.COM>sele8t (!) neste$_ta+le_et_re&s !(8o4nt,!- &rom T_0T_B#

CO0T,!-

JJ

NESTED_TABLE_SET_SETID

&sage' $!S+!"+A6L!"S!+"S!+#

escription' 1ith this hint. user can access to nested ta,le directly*

HELLODBA.COM>sele8t (!) 0ESTED_TABLE_SET_SETFD !(8o4nt,!- &rom T_0T_B#

CO0T,!-

JJ

NO_MONITORING

&sage' $O"MO$#+O3#$G

escription' Pre0ent Oracle monitor the column usage in predication. conse(uently. the

dictionary ta,le col"usageI )ill not ,e updated ,y the e9ecution of the statement*

HELLODBA.COM>sele8t lie_re$s &rom s;s.SQLT3_DBA_COL_SA1E_U 9


35/49

an$ ta+le_name = 'T_TABLES' an$ 8ol4mn_name = 'TABLE_0AME'#

LFVE_REDS

JI

HELLODBA.COM>sele8t (!r4n,-!(8o4nt,!- &rom t_ta+les 9e%e8 $+ms_stats.atsele8t lie_re$s &rom s;s.SQLT3_DBA_COL_SA1E_U 9sele8t (!) no_monitorin !((!r4n,I-!(8o4nt,!- &rom t_ta+les 9


36/49

I=I an$ ta+le_name lie 'TZ'#

CO0T,!-

6

HELLODBA.COM>e%e8 $+ms_stats.atsele8t lie_re$s &rom s;s.SQLT3_DBA_COL_SA1E_U 9sele8t (! 0o_T0E,- !((!)0O_SQL_T0E!(8o4nt,!- &rom t_4sers#

CO0T,!-

6J


37/49

HELLODBA.COM>e%e8 e%e8_name = $+ms_s*lt4ne.e%e84te_t4nin_tas ,tas_name5

'EEC_'s4+str,tas_name5 lentsele8t $+ms_s*lt4ne.reort_t4nin_tas ,tas_name- &rom $4al#

... ...

ADDFTFO0AL F07ORMATFO0 SECTFO0

\]^ SQL `bc

RESTRICT_ALL_REF_CONS

&sage' 3!S+3#C+"ALL"3!4"CO$S

escription' 3estricts all cascaded operations caused ,y referencing constraints in the

transactions*

HELLODBA.COM>sele8t o9ner5 ta+le_name5 8onstraint_name5 r_o9ner5r_8onstraint_name5 $elete_r4le &rom $+a_8onstraints 9


38/49

HELLODBA.COM>$elete (!)RESTRFCT_ALL_RE7_CO0S!(&rom t_ 9sele8t 8o4nt,a- &rom t_8 98ommit#

8ommit

!

ERROR at line J

ORAKJ transa8tion rolle$ +a8

ORAK interit; 8onstraint ,DEMO.T_C_7V- violate$ 8alter session set 2_.+;_


39/49

HELLODBA.COM>e%e8 s*l_e%lain,'sele8t (!)*+_name,M- SE_CO0CAT,/M-!(o9ner58o4nt,J- &rom t_o+:e8ts o ro4 +; o9ner'5 'T

GFCAL OTLF0E'-#

lan e%e8 s*l_e%lain,'sele8t (!)*+_name,M-

0O_SE_HASH_A11RE1ATFO0,/M-!(o9ner5 8o4nt,J- &rom t_o+:e8ts o ro4 +; o9ner'5'TGFCAL OTLF0E'-#

lan


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F$ Oeration 0ame Ro9s B;tes Cost ,ZC-Time

SELECT STATEME0T 6 J6I JK ,I-

J SORT 1RO BG 6 J6I JK ,I-

F0DE 7AST 7LL SCA0 T_OBPECTS_FDI JJ V JI ,-

BYPASS_RECURSIVE_CHECK

&sage' 6%PASS"3!C&3S#7!"CH!CJ

escription' &n5no)n* #t might instruct the parser not do recursi0e chec5ing* #t could ,e

o,ser0ed in the internal statement generated ,y Materialized 7ie) updating*

emo'

HELLODBA.COM>alter session set s*l_tra8e=tr4e#

Session altere$.

HELLODBA.COM>e%e8 $+ms_mvie9.re&res 'MU_TABLES'-#

L(SQL ro8e$4re s488ess&4ll; 8omlete$.

1e got ,elo) statement from the tracing content*


41/49

F0SERT (!) BGASS_RECRSFUE_C ECV !( F0TO2DEMO2.2MU_TABLES2,2O?0ER252TABLE_0AME252TABLESACE_0AME252CREATED252LAST_DDL_TFME2- SELECT2T2.2O?0ER252T2.2TABLE_0AME252T2.2TABLESACE_0AME252O2.2CREATED252O2.2LAST_DDL_TFM

E2 7ROM 2T_TABLES2 2T252T_OBPECTS2 2O2 ?HERE 2T2.2O?0ER2=2O2.2O?0ER2 A0D

2T2.2TABLE_0AME2=2O2.2OBPECT_0AME2 A0D 2O2.2OBPECT_TGE2=2SGS_B_2 A0D2T2.2TABLESACE_0AME2 FS 0OT 0LL

BYPASS_UJVC

&sage' 6%PASS"&K7C

escription' &n5no)n* #t might instruct parser not chec5 uni(ue constraint for the Eoin 0ie)*

#t could ,e o,ser0ed in the internal statement generated ,y Materialized 7ie)

updating*

1e got ,elo) statement from the trace /le generated in pre0ious demo*

4$ate (!) BGASS_PUC !( , sele8t s.stat4s stat4s &rom sna3 s5sna_re&time3 r 9e%e8 s*l_e%lain,'SELECT (!) $omain_in$e%_&ilter,t t_ta+les_$i%6- !(! 7ROM t_ta+les t ?HERE CO0TAF0S,o9ner5 ''aaa''5J-> A0D stat4s = ''UALFD'''5'TGFCAL'-#

F$ Oeration 0ame Ro9s B;tes Cost,ZC- Time


42/49

SELECT STATEME0T J J ,-

J

J TABLE ACCESS BG F0DE RO?FD T_TABLES J J ,-J

! DOMAF0 F0DE T_TABLES_DF6

,- J

re$i8ate Fn&ormation ,i$enti&ie$ +; oeration i$-

a88ess,2CTSGS2.2CO0TAF0S2,2O?0ER25'aaa'5J->-

&ilter,2STATS2='UALFD'-

NO_DOMAIN_INDEX_FILTER

&sage' $O"OMA#$"#$!8"4#L+!3>?@6loc5B @+a,leB ?> @#nde9BDD or

$O"OMA#$"#$!8"4#L+!3>?@6loc5B @+a,leB ?> @#nde9ed ColumnsBDD

escription' Pre0ents the optimizer the push /lter to Composite omain #nde9*

HELLODBA.COM>e%e8 s*l_e%lain,'SELECT (!) no_$omain_in$e%_&ilter,t t_ta+les_$i%6-!( ! 7ROM t_ta+les t ?HERE CO0TAF0S,o9ner5 ''aaa''5J-> A0D stat4s = ''UALFD'''5'TGFCAL'-#

F$ Oeration 0ame Ro9s B;tes Cost,ZC- Time


43/49

SELECT STATEME0T J J ,-J

! J TABLE ACCESS BG F0DE RO?FD T_TABLES J J ,-J

! DOMAF0 F0DE T_TABLES_DF6 ,- J


J &ilter,2STATS2='UALFD'-

a88ess,2CTSGS2.2CO0TAF0S2,2O?0ER25'aaa'5J->-

DOMAIN_INDEX_SORT

&sage' OMA#$"#$!8"SO3+

escription' #nstructs the optimizer the push sorting columns to Composite omain #nde9*

HELLODBA.COM>e%e8 s*l_e%lain,'SELECT (!) $omain_in$e%_sort !( ! 7ROM t_ta+les t?HERE CO0TAF0S,ta+lesa8e_name5 ''aaa''5J-> ORDER BG ta+le_name5 s8ore,J- $es8'5'TGFCAL'-#

lan


44/49

,ZC- Time

SELECT STATEME0T J J ,-J

J TABLE ACCESS BG F0DE RO?FD T_TABLES J J ,-J

! DOMAF0 F0DE T_TABLES_DF ,- J


a88ess,2CTSGS2.2CO0TAF0S2,2TABLESACE_0AME25'aaa'5J->-

NO_DOMAIN_INDEX_ SORT

&sage' $O"OMA#$"#$!8" SO3+

escription' Pre0ents the optimizer the push sorting columns to Composite omain #nde9*

HELLODBA.COM>e%e8 s*l_e%lain,'SELECT (!) no_$omain_in$e%_sort !( ! 7ROM t_ta+lest ?HERE CO0TAF0S,ta+lesa8e_name5 ''aaa''5J-> ORDER BG ta+le_name5 s8ore,J-$es8'5 'TGFCAL'-#

F$ Oeration 0ame Ro9s B;tes Cost


45/49

,ZC- Time

SELECT STATEME0T J J ,- J

J SORT ORDER BG J J ,- J

TABLE ACCESS BG F0DE RO?FD T_TABLES J J ,- J

! 6 DOMAF0 F0DE T_TABLES_DF ,- J


6 a88ess,2CTSGS2.2CO0TAF0S2,2TABLESACE_0AME25'aaa'5J->-

DST_UPGRADE_INSERT_CONV

&sage' S+"&PG3A!"#$S!3+"CO$7

escription' 1ith this hint. Oracle )ill add an internal function

>O3A"S+"CO$7!3+>#$+!3$AL"4&$C+#O$>DDD to modify the column de/ned as +#M!S+AMP

1#+H +#M! O$! )hen using pac5age 6MS"S+ to upgrade the time zone of the data,ase*

NO_DST_UPGRADE_INSERT_CONV

&sage' $O"S+"&PG3A!"#$S!3+"CO$7

escription' 1ith this hint. Oracle )ill not add an internal function

>O3A"S+"CO$7!3+>#$+!3$AL"4&$C+#O$>DDD to modify the column de/ned as +#M!S+AMP

1#+H +#M! O$! )hen using pac5age 6MS"S+ to upgrade the time zone of the data,ase*


46/49

STREAMS

&sage' S+3!AMS

escription' &n5no)n* #t might instructs the SQL e9ecution to transfer the data in stream*

DEREF_NO_REWRITE

&sage' !3!4"$O"3!13#+!>@6loc5BD

escription' &n5no)n* #t might pre0ent the optimizer to re)rite the Materialized 7ie)

)ith 6L !4!33! option*

MV_MERGE

&sage' M7"M!3G!

escription' &n5no)n* #t might ,e used for C&6!*

EXPR_CORR_CHECK

&sage' !8P3"CO33"CH!CJ

escription' &n5no)n* #t might instruct the parser to do referencing chec5ing )here

analyzing !9pression 4ilter*

INCLUDE_VERSION

&sage' #$CL&!"7!3S#O$

escription' &n5no)n* #t could ,e o,ser0ed from the internal statement generated ,y

Ad0anced 3eplication* #t might ,e used to 5eep the compati,ility )hen replicating data

among data,ases )ith di2erent 0ersions*

VECTOR_READ

&sage' 7!C+O3"3!A

escription' &n5no)n* #t might ,e used for 7ector 4ilter in hash Eoin*

VECTOR_READ_TRACE

&sage' 7!C+O3"3!A"+3AC!

escription' &n5no)n* #t might ,e used for 7ector 4ilter in hash Eoin*


47/49

USE_WEAK_NAME_RESL

&sage' &S!"1!AJ"$AM!"3!SL

escription' &n5no)n* #t might instructs the parser using the internal name instead the user-

de/ned name to /nd 3esource Location* #t could ,e o,ser0ed from the internal statements

generated statistics data gathering and !9pression 4ilter*

sele8t (!) no_arallel,t- no_arallel_in$e%,t- $+ms_stats 84rsor_salter session set events 's*l_tra8e 9ait=tr4e5 +in$=tr4e5

lan_stat=all_e%e84tions'#

Session altere$.

HELLODBA.COM>F0SERT (!) 0ESTED_TABLE_7AST_F0SERT !( F0TO t_nt_ta+le sele8to+:e8t_i$5 simle_t;e,o+:e8t_name- &rom t_o+:e8ts#

... ...

1e got ,elo) statement from the trace /le*

F0SERT (!) 0O_ARTFAL_COMMFT RE7_CASCADE_CRSOR !( F0TO 2DEMO2.2T_0T_B2,20ESTED_TABLE_FD252COLM0_UALE2- UALES,J5 -


48/49

REF_CASCADE_CURSOR

&sage' 3!4"CASCA!"C&3SO3

escription' &n5no)n* #t might ,e used to pre0ent the commit of internal recursi0e

transaction* #t could ,e o,ser0ed from the internal statements generated ,y maintenance of

the ta,le )ith nested o,Eect*

3efer to the demo of $O"PA3+#AL"COMM#+

NO_REF_CASCADE

&sage' $O"3!4"CASCA!

escription' &n5no)n* #t might pre0ent the internal recursi0e statement to use the cascade

cursor*

SQLLDR

&sage' SQLL3

escription' &n5no)n* #t might ,e used in the internal statements generated ,y SQLLoader*

SYS_RID_ORDER

&sage' S%S"3#"O3!3

escription' &n5no)n* #t might ,e used in the internal statements generated ,y

maintenance of Materialized 7ie)*

OVERFLOW_NOMOVE

&sage' O7!34LO1"$OMO7!

escription' &n5no)n* #t might pre0ent Oracle to mo0e the data of other segment )hen

o0erNo) occurs due to partition splitting*

LOCAL_INDEXES

&sage' LOCAL"#$!8!S

escription' &n5no)n

MERGE_CONST_ON

&sage' M!3G!"CO$S+"O$


49/49

escription' &n5no)n

QUEUE_CURR

&sage' Q&!&!"C&33

escription' &n5no)n* #t might ,e used for Ad0anced Queue*

CACHE_CB

&sage' CACH!"C6>?@6loc5B @+a,leBD

escription' &n5no)n* #t might ,e used for Ad0anced Queue*

+race the process of 6MS"AQ*!Q&!&&! >deli0ery"mode is P!3S#S+!$+D. )e got ,elo)

statement*

$elete (!) CAC E_CB,2QETABLET2- !( &rom 2DEMO2.2QETABLET2 9

flashback snapshot of schema

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