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Oracle JVM

HTTP

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Client

Client

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Availability

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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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PXOWLSOHLQVWDQFHVRIWKH2UDFOH'DWDEDVHUXQQLQJ2UDFOH3DUDOOHO6HUYHU
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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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Oracle9

i Application Server Page 11

Client

Apache JServ

using JDK

HTTP

Server

Client

Client

Client

BUG



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Client

Oracle JVM

HTTP

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Client

Client

Client

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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





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on Node A

Client

Network

Load-

Balancer

HTTP Server

on Node B

Oracle JVM

Oracle JVM

Oracle JVM





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Network

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HTTP Server

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Oracle JVM

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Death detection and restart

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Oracle9

i Application Server Page 13

Failover

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HTTP

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Apache

JServ

Oracle Database

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Oracle Database

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Load Balancing

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Oracle9

i Application Server Page 14

0DQ\RIWKHRWKHU2UDFOHL$6VHUYLFHVH[HUFLVHORDGEDODQFLQJWHFKQLTXHVDVZHOO
3OHDVHVHHWKHVHSDUDWHZKLWHSDSHUVIRUGHWDLOVRQWKHORDGEDODQFLQJFDSDELOWLHVRI
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HTTP Server with a Single Host

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DQGRQO\WKHFKLOGZKRFXUUHQWO\RZQVWKHPXWH[LVDOORZHGWRSXOODUHTXHVWIURP
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)LJXUHVKRZVWKLVPHFKDQLVP





Client

Child process

Child process

Child process

Master

process

Client

Port 80

Mutex





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Child process

Child process

Master

process

Client

Port 80

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Child process

Child process

Master

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Child process

Master

process

Client

Port 80

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:HE&DFKH

Oracle9

i Application Server Page 15





HTTP Server

on Node A

HTTP Server

on Node B

Cisco

Local Director

Client

Client





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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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FRQWDLQHUVEDVHGRQDZHLJKWHGDOJRULWKPZKHUHWKHV\VWHPDGPLQLVWUDWRUSURYLGHV
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UXQQLQJRQPRUHSRZHUIXOKDUGZDUHFDQEHDOORFDWHGPRUHUHTXHVWVWKDQLQVWDQFHV
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Apache

JServ

Apache

JServ

Apache

JServ

Apache

JServ

Client

Apache

JServ





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Oracle EJE with Single Host

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Oracle9

i Application Server Page 16





Client

Listener
process

Dispatcher

process A

Dispatcher

process B

Process Monitor

(PMON)





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Listener
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process A

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process B

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Dispatcher A is available

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process A

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process B

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Listener
process

Dispatcher

process A

Dispatcher

process B

Process Monitor

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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





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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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process

Shared server

process

Request

queue

Dispatcher

process A

Dispatcher

process B





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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

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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.