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Oracle JVM

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Client

Client

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Availability

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DQXPEHURIIHDWXUHVDQGPHFKDQLVPVGHVLJQHGWRNHHS\RXUV\VWHPDYDLODEOH
GHVSLWHOLPLWHGVHUYHUIDLOXUHV

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SURFHVVHVDQGLQVRPHFDVHVLWSHUIRUPVVHVVLRQIDLORYHU

Oracle9

i Application Server Page 10

No single point of failure

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H[SRVHVQRVLQJOHSRLQWRIIDLOXUH7KLVPHDQVWKDWGHVSLWHWKHIDLOXUHRIDQ\QRGH
LQWKHV\VWHP2UDFOHL$6ZLOOFRQWLQXHWRIXQFWLRQDQGVHUYLFHFOLHQWUHTXHVWV
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ZKLFKKDVQRVLQJOHSRLQWRIIDLOXUHLQWKHHQWLUHV\VWHPLQFOXGLQJERWKWKH
DSSOLFDWLRQVHUYHUDQGWKHGDWDEDVH$Q\QRGHFDQIDLODQGWKHV\VWHPZLOOFRQWLQXH
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-6HUYLQVWDQFH7KH2&,SURJUDPVUXQQLQJLQ$SDFKH-6HUYZLOOTXHU\DQ\RIWKH
2UDFOHL$6'DWDEDVH&DFKHLQVWDQFHVZKLFKDUHVXSSRUWHGLQWKHEDFNHQGE\
PXOWLSOHLQVWDQFHVRIWKH2UDFOH'DWDEDVHUXQQLQJ2UDFOH3DUDOOHO6HUYHU
3OHDVHQRWHWKDWWKHQHWZRUNORDGEDODQFHULQ)LJXUHPD\EHDWKLUGSDUW\SURGXFW
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FRQILJXUDWLRQ

HTTP

Server

Client

Network

load-

balancer

HTTP

Server

HTTP

Server

Apache

JServ

Apache

JServ

Apache

JServ

Oracle8i

Oracle8i

Cache

Oracle8i

Cache

Oracle8i

Cache

HTTP

Server

Oracle8i

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Session isolation

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XVHUVZLWKVHVVLRQVRQWKDW-'.-90LQVWDQFHZLOOEHDIIHFWHG

Oracle9

i Application Server Page 11

Client

Apache JServ

using JDK

HTTP

Server

Client

Client

Client

BUG

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UHFUHDWHVWKHGRZQHGSURFHVVIRUWKHDIIHFWHGFOLHQW

Client

Oracle JVM

HTTP

Server

Client

Client

Client

BUG

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Connection rerouting

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WUDQVSDUHQWO\UHURXWHVUHTXHVWVWKURXJKIXQFWLRQDOVHUYLFHV

Oracle9

i Application Server Page 12

HTTP Server

on Node A

Client

Network

Load-

Balancer

HTTP Server

on Node B

Oracle JVM

Oracle JVM

Oracle JVM

$$FOLHQWUHTXHVWFRPHVLQDQGLV
URXWHGWRDQ+7736HUYHULQVWDQFHDQG
DQ2UDFOH(-(LQVWDQFH

HTTP Server

on Node A

Client

Network

Load-

Balancer

HTTP Server

on Node B

Oracle JVM

Oracle JVM

Oracle JVM

%7KHDSSOLFDWLRQLQ2UDFOH(-(LV
VWDWHIXODQGVHVVLRQVWDWHLVUHWDLQHGLQ
WKHLQVWDQFH$OVRDFRRNLHPD\EH
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HTTP Server

on Node A

Client

Network

Load-

Balancer

HTTP Server

on Node B

Oracle JVM

Oracle JVM

Oracle JVM

&,QEHWZHHQUHTXHVWVWKH+773
6HUYHURQ1RGH$JRHVGRZQ

HTTP Server

on Node A

Client

Network

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HTTP Server

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Oracle JVM

Oracle JVM

Oracle JVM

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2UDFOHL$6GHWHFWVWKLVIDLOXUHDQGUHVWDUWVWKHSURFHVV

Death detection and restart

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$SDFKH-6HUYLQVWDQFHVLQDIXWXUHUHOHDVH

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Oracle9

i Application Server Page 13

Failover

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FOLHQWVVKRXOGQRWSHUFHLYHDORVVRIVHUYLFH)DLORYHULVWKHLQIUDVWUXFWXUHWRKLGH
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URXWLQJ$IWHUIDLOXUHRIVWDWHIXOVHUYLFHV2UDFOHL$6FDQUHURXWHVRPHW\SHVRI
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2UDFOHL$6'DWDEDVH&DFKH,IDFDFKHQRGHJRHVGRZQFOLHQWVHVVLRQVZLOOEH
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HTTP

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Apache

JServ

Oracle Database

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Oracle Database

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HTTP

Server

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Oracle Database

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Load Balancing

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HIILFLHQWXVHRILWVSURFHVVLQJUHVRXUFHV2UDFOHL$6ORDGEDODQFHVHIILFLHQWO\ERWK
EHWZHHQWKUHDGVDQGSURFHVVHVRQDVLQJOHQRGHDQGEHWZHHQQRGHVLQDPXOWL
QRGHGHSOR\PHQW)XUWKHU2UDFOHL$6FDQEHGHSOR\HGLQPLGGOHWLHUVHUYHU
IDUPV
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Oracle9

i Application Server Page 14

0DQ\RIWKHRWKHU2UDFOHL$6VHUYLFHVH[HUFLVHORDGEDODQFLQJWHFKQLTXHVDVZHOO
3OHDVHVHHWKHVHSDUDWHZKLWHSDSHUVIRUGHWDLOVRQWKHORDGEDODQFLQJFDSDELOWLHVRI
WKH2UDFOHL$6)RUPV2UDFOHL$65HSRUWV6HUYHUDQGRWKHUFRPSRQHQWVHUYLFHV

HTTP Server with a Single Host

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DQGRQO\WKHFKLOGZKRFXUUHQWO\RZQVWKHPXWH[LVDOORZHGWRSXOODUHTXHVWIURP
WKHVRFNHW2QFHDFKLOGUHFHLYHVDUHTXHVWEXWEHIRUHLWEHJLQVVHUYLFLQJWKH
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ZD\DFFHVVWRWKHVRFNHWLVVHULDOL]HGEXWFKLOGUHQPD\VHUYLFHUHTXHVWVLQSDUDOOHO
)LJXUHVKRZVWKLVPHFKDQLVP

Client

Child process

Child process

Child process

Master

process

Client

Port 80

Mutex

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FKLOGUHQOLVWHQLQJRQWKHVDPHVRFNHW

Client

Child process

Child process

Child process

Master

process

Client

Port 80

Mutex

%&OLHQWUHTXHVWLVVHUYLFHGE\WKHFKLOG
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Child process

Child process

Master

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Port 80

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Client

Child process

Child process

Child process

Master

process

Client

Port 80

Mutex

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QHZFKLOGSURFHVVZLWKWKHPXWH[

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HTTP Server with Multiple Hosts

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Oracle9

i Application Server Page 15

HTTP Server

on Node A

HTTP Server

on Node B

Cisco

Local Director

Client

Client

$)LUVWUHTXHVWLVGLVSDWFKHGE\/RFDO
'LUHFWRUWRRQHQRGH

HTTP Server

on Node A

HTTP Server

on Node B

Cisco

Local Director

Client

Client

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Apache JServ with Single and Multiple Hosts

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-6HUYLQVWDQFHV$SDFKH-6HUYLQVWDQFHVFDQUXQFRQFXUUHQWO\RQDVLQJOHKRVWRUEH
GLVWULEXWHGRYHUPXOWLSOHKRVWVPRGB-VHUYDOORFDWHVQHZUHTXHVWVWRWKHVHUYOHW
FRQWDLQHUVEDVHGRQDZHLJKWHGDOJRULWKPZKHUHWKHV\VWHPDGPLQLVWUDWRUSURYLGHV
ZHLJKWVIRUWKHYDULRXVFRQWDLQHULQVWDQFHV,QWKLVZD\$SDFKH-6HUYLQVWDQFHV
UXQQLQJRQPRUHSRZHUIXOKDUGZDUHFDQEHDOORFDWHGPRUHUHTXHVWVWKDQLQVWDQFHV
RQOHVVSRZHUIXOPDFKLQHV)LJXUHLOOXVWUDWHVDQH[DPSOHRIWKLVRSHUDWLRQ

HTTP

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Apache

JServ

Apache

JServ

Apache

JServ

Apache

JServ

Client

Apache

JServ

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VLQJOHQRGHRUGLVWULEXWHGDFURVVPDQ\QRGHV

Oracle EJE with Single Host

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2UDFOH'DWDEDVH0XOWL7KUHDGHG6HUYHUDVRSKLVWLFDWHGORDGEDODQFLQJPHFKDQLVP
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)LJXUHDQG)LJXUH7KHILJXUHVUHIHUHQFHWKH2UDFOH(-(DVDQH[DPSOHEXW
FRXOGDOVREHGLVFXVVLQJWKH2UDFOH3/64/(QJLQHRU2UDFOH'DWDEDVH&DFKH

Oracle9

i Application Server Page 16

Client

Listener
process

Dispatcher

process A

Dispatcher

process B

Process Monitor

(PMON)

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Client

Listener
process

Dispatcher

process A

Dispatcher

process B

Process Monitor

(PMON)

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Listener
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Dispatcher A is available

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process A

Dispatcher

process B

Process Monitor

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Client

Listener
process

Dispatcher

process A

Dispatcher

process B

Process Monitor

(PMON)

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WKHQHZO\DVVLJQHGGLVSDWFKHU

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Shared server

process

Shared server

process

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queue

Dispatcher

process A

Dispatcher

process B

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Shared server

process

Shared server

process

Request

queue

Dispatcher

process A

Dispatcher

process B

%:KHQDVHUYHUSURFHVVEHFRPHV
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Oracle9

i Application Server Page 17

Shared server

process

Shared server

process

Request

queue

Dispatcher

process A

Dispatcher

process B

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Shared server

process

Shared server

process

Request

queue

Dispatcher

process A

Dispatcher

process B

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FOLHQWUHTXHVWVWRGLVSDWFKHUSURFHVVHVRQDVLQJOHQRGHWKHOLVWHQHUXVHVDVLPSOH
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Listener
process

Dispatcher

on node B

Dispatcher

on node B

PMON on

node B

Dispatcher

on node A

PMON on

node A

Dispatcher

on node A

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Oracle9

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Oracle9

i Application Server Page 19

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i Application Server Page 20

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i Application Server Page 21

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Oracle9

i Application Server Page 23

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Oracle9

i Application Server Page 24

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2UDFOHL$6FDQEHGHSOR\HGLQDPXOWLWXGHRIFRQILJXUDWLRQVHQDEOLQJ\RXWRUH
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Oracle9

i Application Server

February 2001

Oracle Corporation

World Headquarters

500 Oracle Parkway

Redwood Shores, CA 94065

U.S.A.

Worldwide Inquiries:

Phone: [phone]

Fax: [phone]

www.oracle.com

Oracle Corporation provides the software

that powers the internet.

Oracle is a registered trademark of Oracle Corporation. Various

product and service names referenced herein may be trademarks

of Oracle Corporation. All other product and service names

mentioned may be trademarks of their respective owners.

Copyright © 2000 Oracle Corporation

All rights reserved.