JavaDbJazoon07

8/11/2019 JavaDbJazoon07

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Java DB Performance

Olav Sandst

Sun Microsystems, Trondheim, Norway

Submission ID: 86


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AGENDA

! "ava D# introduction

! $on%i&urin& "ava D# %or 'er%ormance

! (ro&rammin& ti's

! )nderstandin& "ava D# 'er%ormance

! O'en*source database 'er%ormance


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Java DB

! Sun+s su''orted distribution o% 'ache Derby

- all develo'ment done in the 'ache Derby community

! $om'lete S./ database includin&:

- views, tri&&ers, stored 'rocedures, %orei&n 0eys

- multi*user transaction su''ort! Security:

- data encry'tion, client authentication, 12NT3245O4

! Standard based:

- "D#$ 7 and S./93993;3 "ava, bundled in Sun "D 6 and 1lass%ish

! The database%or "ava a''lications


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Java DB Architecture: Embedded

Log and Data

"

ava5irtualMachine

"D#$

S./

ccess

Stora&eDatabase buffer

''lication! Include derby?arin your

class'ath

! #oot the "ava D# en&ine=@

Class.forName(org.apache.derby.jdbc.

EmbeddedDriver);

! $reate a new database

Connection conn

Driver!anager.getConnection(jdbc"derby"dbName; #

createtr$e);

=@ O'tional when runnin& with "D 6


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Java DB Architecture: Client-erver

Log and Data

"ava 5irtual Machine

"D#$

S./ccess

Stora&eDatabase buffer

Networ0 ServerApplication

"D#$

Application"D#$

Application"D#$


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AGENDA


! Configuring Java DB for !erformance

! (ro&rammin& ti's




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Performance "i! #:e!arate Data and Log Devices

Log on se!arate dis$:! )tiliAe seBuential write bandwidth

on dis0

! $on%i&uration:

"D#$ connection url:

logDevice%path&

Performance ti!:

! )se se'arate dis0s %or data and lo& device


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Dis$ Activit%

Disk head movementfor 5 seconds ofdatabase activity

Data and lo&

on same dis0

Data and lo&on se'arate dis0s


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Performance "i! &:"une Database Buffer i'e

! $ache o% %reBuently used data'a&es in memory

! $ache*miss leads to read %romdis0

! SiAe:- de%ault 7 M#

- derby.storage.pageCache'ie

Performance ti!:

! Increase the siAe o% the database bu%%er to &et %reBuently accesseddata in memory


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Performance and Durabilit%:Data and Log Devices

Log device:! SeBuential write o% transaction

lo&

! Synchronous as 'art o% commit

! 1rou' commit

Data device:

! Data re&ularly written to dis0 as'art o% chec0'oint

! Data read %rom dis0 on demandData

"ava 5irtual Machine

"ava D#

Database

buffer

Log

buffer

Log


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Performance "i! (:"rade Durabilit% for Performance

Log device configuration:! Dis0+s write cache:

- disabled

- enabled

! Disable durability: derby.system.d$rabilitytest

- lo& %lushed to dis0 after commit

)A*N+NG:Crite cache reduces 'robability o% success%ul recovery a%ter'ower %ailure


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Log Device Configuration:Effect on Durabilit%

durabilit%

, test

)rite

cache

No rite

cache

durabilit%

, test

)rite

cache

No rite

cache

=

;

7

6

E

8

9

= Process crash Poer failure

.ailed to recover

Loss of u!dates

uccessfull recover%

Test

Durabilit% ti!:Disable the dis0+s write cache on the lo& device


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Performance "i! /:0se Embedded Java DB

(er%ormance advanta&es:

! saves inter*'rocess or servercommunication

! reduces $() usa&e

! reduces hardware cost

(otential issues:

! scalability Fone machine@

! "5M con%i&uration

"D#$Java DB

A!!lication


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Glassfish and Java DB:Client-erver vs Embedded1 e2am!le

$lient*Server 4mbedded

=

;

7

6

E8

9

=

==

=

=;

Throu&h'ut

$lient*Server 4mbedded

E

=

=

=

=E

E

;

;

;

;E

$() )sa&e Fms@

"ava D# 1lass%ish

"D#$Java DB

GlassfishGlassfish

"D#$Glassfish

Java DB


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AGENDA



! Programming ti!s




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Performance "i! 3:0se Pre!ared tatements

! $om'ilation o% S./ statements is eG'ensive:'tatement s c.create'tatement();

hile (...) *s.e+ec$te,$ery('E-EC / 012! t 34E1E a # id);

5

- &enerates "ava byte code and loads &enerated classes

! (re'ared statements eliminate this cost:

6repared'tatement s c.prepare'tatement('E-EC / 012! t 34E1E a 7);

hile (...) * s.set8nt(9: id);

s.e+ec$te,$ery();5

- &enerated "ava byte code can be "IT com'iled


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0se Pre!ared tatements1 e2am!le

"hrough!ut: CP0 usage:

(re'aredStatement Statement

E

=

=

=

=E

E

$()

usa&eFms

3tG@

Performance ti!:

! 0E 're'ared statements * and *E0Ethem


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=8

Performance "i! 4:Avoid "able cans

Two ways o% locatin& data:! Table scan: reads the entire table

! IndeG: %inds the data by readin& a %ew bloc0s

void table scans:

! )se indeGes to o'timiAe %reBuently used access 'aths:

C1EE 8NDE< inde+Name 2N tableName (col$mn)


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=9

Avoid "able cans1 e2am!le

= = = = = = = M

=

=

=

=

=

=2etrieval time %or one record

IndeG

No indeG

Table siAe Fnumber o% records@

2es'onsetimeFms@

Performance ti!:

! $reate and use indeGes


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Performance "i! 5:6el! the Database to Perform

"D#$ ti's:

! $lose "D#$ ob?ects a%ter in use

- $onnections, Statements, 2esultSets, Streams

! )se transactions * do not rely on auto*commit

- (articularly %or insert3u'date3delete o'erations! #atch u'dates reduce networ0 tra%%ic


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AGENDA



! (ro&rammin& ti's

! 0nderstanding Java DB !erformance



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Performance "i! 7:8no the Load and the *esource 0sage

! now the load on the database:derby.lang$age.log'tatemente+ttr$e

- all eGecuted Bueries written to derbylo&

! now how the Bueries are eGecuted:

derby.lang$age.log,$ery6lantr$e

! .uery*'lan and run*time statistics:

'='C'>?8-.'='C'>'E>1?N8!E'8'8C'(9)'='C'>?8-.'='C'>'E>'8'8C'>8!8N@(9)'='C'>?8-.'='C'>@E>1?N8!E'8'8C'()

! )se OS and "ava tools to %ind resource usa&e:

- $(), memory, dis0 IO %or lo& and data device

Performance ti!:

! )se the available tools to understand what the database is doin& andwhere resources are s'ent


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E2am!le:9uer% Plan and *un-time tatistics

AA enable r$nBtime statistics'tatement s c.create'tatement();s.e+ec$te?pdate(C-- '='C'>?8-.'='C'>'E>1?N8!E'8'8C'(9));s.e+ec$te?pdate(C-- '='C'>?8-.'='C'>'E>'8'8C'>8!8N@(9));

AA e+ec$te $ery1es$lt'et rs s.e+ec$te,$ery('E-EC 9.c from 9:

here 9.c .c and 9.c % FGG);hile (rs.ne+t()) *5rs.close();

AA retrieve $ery plan and r$nBtime statisticsrs s.e+ec$te,$ery(H-?E'

'='C'>?8-.'='C'>@E>1?N8!E'8'8C'());rs.ne+t();'tring str rs.get'tring(9);'ystem.o$t.println(,$ery 6lan" # str);

T= T

"oin

(ro?


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7

Performance "i! :;!timi'er ;verrides

! Override eGecution strate&y selected by o'timiAer! Horce use o% s'eci%ic indeG:

'E-EC / 012! t9 BBDE1I=B6126E18E' inde+t9>c9

34E1E c99

! Horce use o% constraint:

'E-EC / 012! t9 BBDE1I=B6126E18E' constraintc

34E1E c99 and cJ

! Horce s'eci%ic "OIN order and "OIN strate&y:

'E-EC / 012! KBDE1I=B6126E18E' join2rder08


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;!timi'er ;verrides E2am!le

'E-EC t9.c 012! KBDE1I=B6126E18E' join2rder08


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Performance "i! #>:0nderstand Loc$ing +ssues

! /oc0 based concurrency control! Isolation level:

- 2educin& isolation level increases concurrency

! /oc0 escalation:

- De%ault: escalation %rom ro loc$sto table loc$swhen loc0sare set on the table

- derby.locLs.escalationhreshold9GG

- -2CM I-E t9 8N *'41EE


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0nderstand Loc$ing +ssues

2etrieve loc0 in%ormation:

'E-EC / 012! '='C'>[email protected]>I-E


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AGENDA



! (ro&rammin& ti's


! ;!en-source database !erformance


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9

Java DB #>?(: Performance +m!rovements

4mbedded:! reduced synchroniAation K conteGt switches

! reduced $() usa&e

! reduced number o% dis0 u'dates to lo& device

! concurrent read3writes on data device

$lient*server:

! im'roved streamin& o% /O#s

S./ O'timiAer:

! im'roved o'timiAation ;*> increased

throu&h'ut onsim'le Bueries


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Performance +m!rovement1 e2am!le

)'&radin& to Sun "D 6 and "ava D# =;= beta:

/oad: Select one record in a table

4mbedded: $lient*server:


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;=

;!en-ource Database Performance

Databases:! "ava D# =;= beta

- embedded

- client*server

! (ost&reS./ 8=8

! MyS./ ;;

- with InnoD#

Load clients:#? elect load:

= sin&le*record select

&? 0!date load:

; u'dates, = insert, = select

"est Configuration:

! LOut*o%*the*boG

! M# database bu%%er

! Data and lo& on se'arate dis0s! SunHire vA F MD O'teron@

! Solaris =, Sun "ava S4 6


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;

"hrough!ut: ingle-record elect

Main*memory database F= M#@: Dis0*based database F= 1#@:


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;;

"hrough!ut: 0!date Load

Main*memory database F= M#@: Dis0*based database F= 1#@:


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ummar%

! Trade*o%%s between durability and 'er%ormance

- 0now your reBuirements and select care%ully

! now what in%luence 'er%ormance

- "ava D# con%i&uration

- user a''lication! Ti's and tools to %ind and solve 'er%ormance bottlenec0s

"ava D# (er%orms

- $om'arable to other o'en*source databases


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;lav andst@ htt!:develo!ers?sun?comavadbun icros%stems olavsun?com

JavaDbJazoon07

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