Oracle Database 10g: Administration Workshop I

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Transcript Oracle Database 10g: Administration Workshop I

Configuring the
Oracle Network Environment
Copyright © 2005, Oracle. All rights reserved.
Objectives
After completing this lesson, you should be able to:
• Use Enterprise Manager to:
–
–
–
–
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Create additional listeners
Create Oracle Net Service aliases
Configure connect-time failover
Control the Oracle Net Listener
•
Use tnsping to test Oracle Net connectivity
•
Identify when to use shared servers versus
dedicated servers
Copyright © 2005, Oracle. All rights reserved.
Oracle Net Services
Application
Oracle Net
Client or
middle tier
RDBMS
TCP/IP
network
Oracle Net
configuration files
11-3
Oracle Net
Listener
Database server
Oracle Net
configuration files
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Oracle Net Listener
Enterprise
Manager
Database
Control
Listener
Oracle databases
Oracle Net
configuration files
<oracle_home>/network/admin/listener.ora
sqlnet.ora
11-4
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Establishing Net Connections
To make a client or middle-tier connection, Oracle Net
requires the client to know the:
• Host where the listener is running
• Port that the listener is monitoring
• Protocol that the listener is using
• Name of the service that the listener is handling
Names Resolution
11-5
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Establishing a Connection
Incoming
connection request
Listener
11-6
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User Sessions
Server
process
User session
PGA
User process
Listener
11-7
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Tools for Configuring and Managing
the Oracle Network
•
•
•
•
11-8
Enterprise Manager Net Services Administration
page
Oracle Net Manager
Oracle Net Configuration Assistant launched by
Oracle Universal Installer
Command line
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Listener Control Utility
Oracle Net listeners can be controlled with the
command-line lsnrctl utility (or from EM).
$lsnrctl
LSNRCTL for Linux: Version 10.2.0.0.0 on 12-MAY-2005 13:27:51
Copyright (c) 1991, 2004, Oracle. All rights reserved.
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> help
The following operations are available
An asterisk (*) denotes a modifier or extended command:
start
services
save_config
change_password
set*
11-9
stop
version
trace
quit
show*
status
reload
spawn
exit
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Listener Control Utility Syntax
Commands from the listener control utility can be
issued from the command line or from the LSNRCTL
prompt.
• UNIX or Linux command-line syntax:
$ lsnrctl <command name>
$ lsnrctl start
$ lsnrctl status
•
Prompt syntax:
LSNRCTL> <command name>
LSNRCTL> start
LSNRCTL> status
11-10
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Listener Home Page
11-12
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Net Services Administration Pages
11-13
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Creating a Listener
1
2
3
4
11-14
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Adding Listener Addresses
5
6
7
11-15
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Database Service Registration
11-16
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Naming Methods
Oracle Net supports several methods of resolving
connection information:
• Easy connect naming: Uses a TCP/IP connect
string
• Local naming: Uses a local configuration file
• Directory naming: Uses a centralized
LDAP-compliant directory server
• External naming: Uses a supported non-Oracle
naming service
Client/application server
Oracle Net
Oracle Net configuration files
11-17
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Easy Connect
•
•
•
•
Is enabled by default
Requires no client-side configuration
Supports only TCP/IP (no SSL)
Offers no support for advanced connection
options, such as:
– Connect-time failover
– Source routing
– Load balancing
SQL> CONNECT hr/[email protected]:1521/dba10g
No Oracle Net configuration files
11-18
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Local Naming
•
•
•
Requires a client-side Names Resolution file
Supports all Oracle Net protocols
Supports advanced connection options, such as:
– Connect-time failover
– Source routing
– Load balancing
SQL> CONNECT hr/[email protected]
Oracle Net
configuration files
11-19
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Directory Naming
•
Requires LDAP with Oracle Net Names Resolution
information loaded:
– Oracle Internet Directory
– Microsoft Active Directory Services
•
•
Supports all Oracle Net protocols
Supports advanced connection options
LDAP directory
SQL> CONNECT hr/[email protected]
Oracle Net
configuration files
11-20
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External Naming Method
•
•
Uses a supported non-Oracle naming service
Includes:
– Network Information Service (NIS) External Naming
– Distributed Computing Environment (DCE) Cell
Directory Services (CDS)
Non-Oracle
naming
service
Oracle Net
11-21
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Configuring Service Aliases
Create or
edit
11-22
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Advanced Connection Options
Oracle Net supports the following advanced
connection options with local and directory naming:
• Connect-time failover
• Load balancing
• Source routing
11-23
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Testing Oracle Net Connectivity
The tnsping utility that tests Oracle Net service
aliases:
• Ensures connectivity between the client and the
Oracle Net Listener
• Does not verify that the requested service is
available
• Supports Easy Connect Names Resolution:
tnsping db.us.oracle.com:1521/dba10g
•
Supports local and directory naming:
tnsping orcl
11-25
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User Sessions: Dedicated Server
User sessions
Server process
Server process
Server process
Listener
11-26
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User Sessions: Shared Servers
Dispatcher
Server process
Server process
Server process
User sessions
Listener
11-27
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SGA and PGA
Oracle Shared Server: User session data is held in the
SGA.
SGA
User
Cursor
session
state
data
PGA
Sort
data
Large pool and
other memory
structures
Remember to factor in shared server memory
requirement when sizing the SGA.
11-28
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Stack
space
Shared Server: Connection Pooling
Idle
client
The client application has been
idle past the specified time, and
an incoming client requests a
connection.
Active
client
New
client
Database
server
This client connection is the 256th
connection into the server. Connection
pooling is turned on, so that this
connection can be accepted.
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The maximum
number of
connections is
configured to 255.
When Not to Use a Shared Server
Certain types of database work must not be performed
by using shared servers:
• Database administration
• Backup and recovery operations
• Batch processing and bulk load operations
• Data warehouse operations
Dispatcher
11-30
Dedicated
Server process
Copyright © 2005, Oracle. All rights reserved.
Summary
In this lesson, you should have learned how to:
• Use Enterprise Manager to:
–
–
–
–
11-31
Create additional listeners
Create Oracle Net Service aliases
Configure connect-time failover
Control the Oracle Net Listener
•
Use tnsping to test Oracle Net connectivity
•
Identify when to use shared servers versus
dedicated servers
Copyright © 2005, Oracle. All rights reserved.
Practice Overview:
Working with Oracle Network Components
This practice covers:
• Configuring local Names Resolution to connect to
another database
• Creating a second listener for connect-time
failover
11-32
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